LogiGrain
payment-ready until 2026-11-21
Exact calculation tools for AI agents, paid per call with x402 (0.001 USDC on Base).
Call it x402 v2
x402 v2
- Base URL
- https://logigrain.net
- Payment
- x402 v2, header channel
$ curl -i 'https://logigrain.net/api/code' An unpaid request returns HTTP 402 with the payment terms. Sign a payment authorization, then retry with the PAYMENT-SIGNATURE header.
Endpoints 19 paid routes on logigrain.net
11 more in Example 402 response
Prices as captured in the 402 response: median $0.001 across the 19 endpoints.
Example 402 response
Endpoints and prices
| Method | Path | Description | Price | Network | Asset | 402 channel | Captured |
|---|---|---|---|---|---|---|---|
| GET | / | Syntax check for JSON, HTML and CSS snippets. | $0.001 | Base | USDC | header | since 11-07 |
| GET | / | Compound interest with optional monthly contributions. | $0.001 | Base | USDC | header | since 11-07 |
| GET | / | Currency conversion using live exchange rates (cached 60 s). | $0.001 | Base | USDC | header | since 11-07 |
| GET | / | Unit conversion: length, weight, speed, data, area, volume, energy, temperature. | $0.001 | Base | USDC | header | since 11-07 |
| GET | / | Date difference, add days, Unix timestamp conversion, weekday count. | $0.001 | Base | USDC | header | since 11-07 |
| GET | / | Japanese era (wareki: 令和/平成/昭和/大正/明治) to Gregorian and back, with real-date and era-start validation, plus Japanese fiscal year. | $0.001 | Base | USDC | header | since 11-07 |
| GET | / | Live forex rates or crypto prices (cached). | $0.001 | Base | USDC | header | since 11-07 |
| GET | / | Japan mortgage tax deduction (住宅ローン控除) for move-ins 2026-2030 (FY2026 reform): borrowing limit and 13/10-year period by home type, performance class, special household and floor area; yearly deduction or a full-period projection from a loan, split between income and resident tax. Refuses older move-ins; asks for missing facts. Checked against National Tax Agency tax answers and an independent implementation. | $0.001 | Base | USDC | header | since 11-07 |
| GET | / | JSON validate, format or minify, with key count and depth. | $0.001 | Base | USDC | header | since 11-07 |
| GET | / | Nine Star Ki (九星気学): main star and monthly star with solar-term boundaries computed astronomically (within about 15 minutes, 1900-2150), Japan time. | $0.001 | Base | USDC | header | since 07-01 |
| GET | / | Safe math expression evaluation (no code execution): functions, constants, variables. | $0.001 | Base | USDC | header | since 11-07 |
| GET | / | Moon phase from a true ephemeris: age, illumination, phase name (Japanese/English), next full and new moon date and time (within about 2 minutes), timezone aware. | $0.001 | Base | USDC | header | since 11-07 |
| GET | / | Japanese public pension estimate (老齢基礎年金) using official parameters for the current fiscal year (FY2026 full amount 847,300 yen): exemptions, early claim/deferral rates, fuka-nenkin. Returns the rule year used and a quotable sentence; asks for the contribution record instead of guessing; warns when parameters are stale. | $0.001 | Base | USDC | header | since 11-07 |
| GET | / | When to start the Japanese public pension: break-even age of early claim or deferral versus a baseline, probability of living to that age from the official Japanese life table (令和7年簡易生命表, by sex), and expected lifetime total for each start age 60-75. Returns the rule year used, assumptions, what would change the answer, and a quotable sentence. Totals cross-checked by an independent implementation. | $0.001 | Base | USDC | header | since 11-07 |
| GET | / | Japan new NISA limits: how much can still be bought this year and next year under the annual limits (つみたて 1.2M / 成長 2.4M yen) and the 18M-yen lifetime book-value limit (成長 up to 12M). Selling frees the book value (cost), not the sale price, from the next year. Returns the rule basis, assumptions, what would change the answer and a quotable sentence; asks for book values instead of guessing. Rules checked against the FSA NISA site. | $0.001 | Base | USDC | header | since 11-07 |
| GET | / | Bayes theorem, exact combinations and permutations (big-integer exact result). | $0.001 | Base | USDC | header | since 11-07 |
| GET | / | Western astrology natal chart (西洋占星術): Sun-Neptune longitudes and signs, ASC/MC, Placidus and whole-sign houses, aspects. Verified against Swiss Ephemeris (planets mostly within 0.03 deg, cusps within 0.01 deg, 1950-2024). | $0.001 | Base | USDC | header | since 07-01 |
| GET | / | Zi Wei Dou Shu (紫微斗数) natal chart: lunar date, 命宮/身宮, 五行局, 14 major stars, auxiliary and malefic stars, 四化, 大限, optional 流年. Lunar-new-year boundary; documented leap-month convention. | $0.001 | Base | USDC | header | since 07-01 |
| GET | / | Four Pillars / BaZi (四柱推命): year, month, day and hour pillars with solar-term boundaries in JST. Pillars cross-checked against an independent Chinese-calendar library on 3,000 random datetimes. | $0.001 | Base | USDC | header | since 07-01 |
Payment evidence
402 payload captured at . Check evidence JSON · Measurement methodology.
First of 19 payloads captured by the monitor.
109 lines, scroll inside
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://logigrain.net/api/era",
"mimeType": "application/json",
"description": "Japanese era (wareki: 令和/平成/昭和/大正/明治) to Gregorian and back, with real-date and era-start validation, plus Japanese fiscal year."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"value": "2019-05-01",
"action": "to_era"
}
},
"output": {
"type": "json",
"example": {
"era": "令和",
"iso": "2019-05-01",
"input": "2019-05-01",
"action": "to_era",
"era_year": 1,
"era_roman": "Reiwa",
"formatted_kanji": "令和1年5月1日",
"formatted_short": "R1.5.1"
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"value"
],
"properties": {
"value": {
"type": "string",
"description": "Era string (e.g. R6, 令和6) or ISO date (YYYY-MM-DD) depending on action"
},
"action": {
"type": "string",
"description": "Operation (default to_iso)"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
} Other captured 402 responses (18)
Captured payload 2 of 19
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://logigrain.net/api/json",
"mimeType": "application/json",
"description": "JSON validate, format or minify, with key count and depth."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"input": "{\"key\":\"value\"}",
"action": "format"
}
},
"output": {
"type": "json",
"example": {
"keys": 1,
"size": "15 B",
"type": "Object",
"depth": 1,
"valid": true,
"action": "format",
"result": "{\n \"key\": \"value\"\n}"
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"input"
],
"properties": {
"input": {
"type": "string",
"description": "URL-encoded JSON string"
},
"action": {
"type": "string",
"description": "Operation to perform (default validate)"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}Captured payload 3 of 19
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://logigrain.net/api/math",
"mimeType": "application/json",
"description": "Safe math expression evaluation (no code execution): functions, constants, variables."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"expr": "sqrt(144)+2^10"
}
},
"output": {
"type": "json",
"example": {
"expr": "sqrt(144)+2^10",
"type": "Integer",
"vars": {},
"valid": true,
"result": 1036
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"expr"
],
"properties": {
"expr": {
"type": "string",
"description": "Math expression, e.g. sqrt(144)+2^10"
},
"vars": {
"type": "string",
"description": "Optional variables, comma-separated k=v pairs, e.g. x=3,y=4"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}Captured payload 4 of 19
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://logigrain.net/api/kyusei",
"mimeType": "application/json",
"description": "Nine Star Ki (九星気学): main star and monthly star with solar-term boundaries computed astronomically (within about 15 minutes, 1900-2150), Japan time."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"date": "1982-06-20",
"time": "10:30"
}
},
"output": {
"type": "json",
"example": {
"kyusei": {
"input": {
"date": "1982-06-20",
"time": "10:30",
"timezone": "Asia/Tokyo"
},
"honmeisei": {
"star": 9,
"name_en": "Kyushi-Kasei",
"name_ja": "九紫火星"
},
"getsumeisei": {
"star": 1,
"name_en": "Ippaku-Suisei",
"name_ja": "一白水星"
},
"kigaku_year": 1982,
"setsu_month": {
"term_ja": "芒種",
"term_start": "1982-06-06T09:33+09:00"
}
}
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"date"
],
"properties": {
"date": {
"type": "string",
"description": "Birth date YYYY-MM-DD (JST). Solar-term (立春/節入り) boundaries handled astronomically."
},
"time": {
"type": "string",
"description": "Birth time HH:MM (JST 24h, default 00:00). Matters only near solar-term boundaries."
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}Captured payload 5 of 19
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://logigrain.net/api/moon",
"mimeType": "application/json",
"description": "Moon phase from a true ephemeris: age, illumination, phase name (Japanese/English), next full and new moon date and time (within about 2 minutes), timezone aware."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"tz": "Asia/Tokyo",
"date": "2026-10-15"
}
},
"output": {
"type": "json",
"example": {
"moon": {
"phase": "waxing_crescent",
"method": "true ephemeris (Meeus ch.47 Moon + ch.25 apparent Sun); phase times within ~2...",
"age_days": 3.97,
"timezone": "Asia/Tokyo",
"is_waxing": true,
"timestamp": "2026-10-14T15:00:00.000Z",
"days_to_new": 25.7,
"days_to_full": 11.5,
"next_new_moon": "2026-11-09",
"phase_name_en": "Waxing Crescent",
"phase_name_ja": "三日月",
"elongation_deg": 45.82,
"next_full_moon": "2026-10-26",
"next_new_moon_time": "2026-11-09T16:02+09:00",
"next_full_moon_time": "2026-10-26T13:11+09:00",
"traditional_name_ja": "繊月(せんげつ)",
"illumination_percent": 15.2
}
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"properties": {
"tz": {
"type": "string",
"description": "Timezone, fixed standard offset (default UTC)"
},
"date": {
"type": "string",
"description": "Reference date YYYY-MM-DD, interpreted as local midnight in tz (default now)"
},
"include": {
"type": "string",
"description": "Comma-separated extras, e.g. trivia"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}Captured payload 6 of 19
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://logigrain.net/api/code",
"mimeType": "application/json",
"description": "Syntax check for JSON, HTML and CSS snippets."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"code": "{\"key\":\"value\"}",
"lang": "json"
}
},
"output": {
"type": "json",
"example": {
"lang": "json",
"chars": 15,
"lines": 1,
"valid": true,
"errors": []
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"lang",
"code"
],
"properties": {
"code": {
"type": "string",
"description": "URL-encoded source code"
},
"lang": {
"type": "string",
"description": "Language to validate"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}Captured payload 7 of 19
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://logigrain.net/api/feed",
"mimeType": "application/json",
"description": "Live forex rates or crypto prices (cached)."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"type": "forex",
"symbols": "JPY,EUR"
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"type"
],
"properties": {
"base": {
"type": "string",
"description": "Base currency for forex (default USD)"
},
"type": {
"type": "string",
"description": "Feed type"
},
"symbols": {
"type": "string",
"description": "Comma-separated symbols (e.g. JPY,EUR or BTC,ETH,XLM)"
}
}
}
},
"additionalProperties": false
}
}
}
}
},
"x402Version": 2
}Captured payload 8 of 19
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://logigrain.net/api/compound",
"mimeType": "application/json",
"description": "Compound interest with optional monthly contributions."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"rate": "7",
"years": "20",
"principal": "10000"
}
},
"output": {
"type": "json",
"example": {
"gain": 28697,
"inputs": {
"rate": "7",
"years": 20,
"monthly": 0,
"principal": 10000
},
"result": 38697,
"invested": 10000,
"multiplier": 3.87
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"principal",
"rate",
"years"
],
"properties": {
"rate": {
"type": "string",
"description": "Annual interest rate in percent (e.g. 7 = 7%)"
},
"years": {
"type": "string",
"description": "Number of years"
},
"monthly": {
"type": "string",
"description": "Optional monthly contribution"
},
"principal": {
"type": "string",
"description": "Initial principal amount"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}Captured payload 9 of 19
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://logigrain.net/api/seiyo",
"mimeType": "application/json",
"description": "Western astrology natal chart (西洋占星術): Sun-Neptune longitudes and signs, ASC/MC, Placidus and whole-sign houses, aspects. Verified against Swiss Ephemeris (planets mostly within 0.03 deg, cusps within 0.01 deg, 1950-2024)."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"tz": "9",
"lat": "35.68",
"lon": "139.77",
"date": "1990-05-15",
"time": "08:30"
}
},
"output": {
"type": "json",
"example": {
"input": {
"tz": 9,
"day": 15,
"lat": 35.68,
"lon": 139.77,
"hour": 8,
"year": 1990,
"month": 5,
"minute": 30
},
"angles": {
"IC": {
"deg": 5.13,
"sign": "Libra"
},
"MC": {
"deg": 5.13,
"sign": "Aries"
},
"ASC": {
"deg": 19.91,
"sign": "Cancer"
},
"DSC": {
"deg": 19.91,
"sign": "Capricorn"
}
},
"aspects": [
{
"a": "Sun",
"b": "Moon",
"orb": 3.15,
"type": "trine",
"separation": 123.15
},
{
"a": "Sun",
"b": "Mars",
"orb": 5.95,
"type": "sextile",
"separation": 65.95
}
],
"planets": {
"Sun": {
"sign": "Taurus",
"longitude": 53.899,
"deg_in_sign": 23.9,
"house_whole": 11,
"house_placidus": 11
},
"Moon": {
"sign": "Capricorn",
"longitude": 290.75,
"deg_in_sign": 20.75,
"house_whole": 7,
"house_placidus": 7
},
"Mercury": {
"sign": "Taurus",
"longitude": 38.088,
"deg_in_sign": 8.09,
"house_whole": 11,
"house_placidus": 10
}
},
"julian_day": 2448026.4791666665
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"date"
],
"properties": {
"tz": {
"type": "string",
"description": "UTC offset hours (default 9)"
},
"lat": {
"type": "string",
"description": "Latitude north (default 35.68)"
},
"lon": {
"type": "string",
"description": "Longitude east (default 139.77)"
},
"date": {
"type": "string",
"description": "Birth date YYYY-MM-DD"
},
"time": {
"type": "string",
"description": "Birth time HH:MM (default 12:00)"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}Captured payload 10 of 19
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://logigrain.net/api/shibu",
"mimeType": "application/json",
"description": "Zi Wei Dou Shu (紫微斗数) natal chart: lunar date, 命宮/身宮, 五行局, 14 major stars, auxiliary and malefic stars, 四化, 大限, optional 流年. Lunar-new-year boundary; documented leap-month convention."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"date": "1990-08-15",
"time": "06:00",
"gender": "male"
}
},
"output": {
"type": "json",
"example": {
"shibu": {
"input": {
"date": "1990-08-15",
"time": "06:00",
"gender": "male",
"time_provided": true,
"lunar_basis_tz": "UTC+8"
},
"sihua": {
"map": {
"化忌": "天同",
"化権": "武曲",
"化禄": "太陽",
"化科": "太陰"
},
"birth_year_stem": "庚"
},
"daxian": {
"note": "Each 大限 spans 10 years; see per-palace 'daxian' field.",
"direction": "順行"
},
"liunian": {
"note": "Provide 'liunian' (year, e.g. 2026) to overlay the annual chart."
},
"palaces": [
{
"stem": "戊",
"branch": "子",
"palace": "財帛宮",
"is_body_palace": false
},
{
"stem": "己",
"branch": "丑",
"palace": "子女宮",
"is_body_palace": false
}
],
"ming_gong": {
"stem": "庚",
"branch": "辰",
"ganzhi": "庚辰"
},
"shen_gong": {
"branch": "戌",
"palace": "遷移宮"
},
"wuxing_ju": {
"name": "金四局",
"number": 4,
"nayin_element": "金"
},
"lunar_date": {
"day": 25,
"year": 1990,
"month": 6,
"is_leap_year": true,
"is_leap_month": false
},
"ziwei_star": "巳",
"hour_branch": "卯",
"tianfu_star": "亥",
"birth_year_pillar": {
"num": 6,
"name": "庚午",
"element": "metal",
"stem_en": "Geng",
"stem_ja": "庚",
"branch_en": "Wu",
"branch_ja": "午",
"stem_branch_en": "Geng-Wu"
}
}
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"date"
],
"properties": {
"date": {
"type": "string",
"description": "Birth date YYYY-MM-DD. Lunar conversion uses China Standard Time (UTC+8) as the charting basis."
},
"time": {
"type": "string",
"description": "Birth time HH:MM (24h). Determines the 時辰 (two-hour branch); 23:00-23:59 counts as next day (夜子時)."
},
"gender": {
"type": "string",
"description": "male or female. Required to compute 大限 (10-year periods); chart is otherwise gender-independent."
},
"liunian": {
"type": "string",
"description": "Annual-chart year (e.g. 2026). When set, overlays 流年 stars and 流年四化 onto each palace."
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}Captured payload 11 of 19
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://logigrain.net/api/probability",
"mimeType": "application/json",
"description": "Bayes theorem, exact combinations and permutations (big-integer exact result)."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"n": "60",
"r": "30",
"type": "combination"
}
},
"output": {
"type": "json",
"example": {
"n": 60,
"r": 30,
"type": "combination",
"result": 118264581564861420,
"formula": "C(n,r) = n! / (r!(n-r)!)",
"result_exact": "118264581564861424",
"exact_as_number": false
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"type"
],
"properties": {
"n": {
"type": "string",
"description": "n, required for combination/permutation"
},
"r": {
"type": "string",
"description": "r, required for combination/permutation"
},
"pa": {
"type": "string",
"description": "P(A), required for bayes"
},
"pba": {
"type": "string",
"description": "P(B|A), required for bayes"
},
"pbna": {
"type": "string",
"description": "P(B|¬A), required for bayes"
},
"type": {
"type": "string",
"description": "Calculation type"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}Captured payload 12 of 19
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://logigrain.net/api/convert",
"mimeType": "application/json",
"description": "Currency conversion using live exchange rates (cached 60 s)."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"to": "JPY",
"from": "USD",
"amount": "100"
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"from",
"to"
],
"properties": {
"to": {
"type": "string",
"description": "Target currency code, e.g. JPY"
},
"from": {
"type": "string",
"description": "Source currency code, e.g. USD"
},
"amount": {
"type": "string",
"description": "Amount to convert (default 1)"
}
}
}
},
"additionalProperties": false
}
}
}
}
},
"x402Version": 2
}Captured payload 13 of 19
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://logigrain.net/api/shichu",
"mimeType": "application/json",
"description": "Four Pillars / BaZi (四柱推命): year, month, day and hour pillars with solar-term boundaries in JST. Pillars cross-checked against an independent Chinese-calendar library on 3,000 random datetimes."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"date": "1990-05-15",
"time": "08:30"
}
},
"output": {
"type": "json",
"example": {
"shichu": {
"input": {
"date": "1990-05-15",
"time": "08:30",
"timezone": "Asia/Tokyo",
"time_provided": true
},
"day_master": "庚",
"day_pillar": {
"num": 16,
"name": "庚辰",
"element": "metal",
"stem_en": "Geng",
"stem_ja": "庚",
"branch_en": "Chen",
"branch_ja": "辰",
"stem_branch_en": "Geng-Chen"
},
"hour_pillar": {
"num": 16,
"name": "庚辰",
"element": "metal",
"stem_en": "Geng",
"stem_ja": "庚",
"branch_en": "Chen",
"branch_ja": "辰",
"stem_branch_en": "Geng-Chen"
},
"setsu_month": {
"term_ja": "立夏"
},
"year_pillar": {
"num": 6,
"name": "庚午",
"element": "metal",
"stem_en": "Geng",
"stem_ja": "庚",
"branch_en": "Wu",
"branch_ja": "午",
"stem_branch_en": "Geng-Wu"
},
"month_pillar": {
"num": 17,
"name": "辛巳",
"element": "metal",
"stem_en": "Xin",
"stem_ja": "辛",
"branch_en": "Si",
"branch_ja": "巳",
"stem_branch_en": "Xin-Si"
},
"day_master_en": "Geng",
"meishiki_year": 1990,
"day_pillar_zi_shifted": {
"num": 16,
"name": "庚辰",
"element": "metal",
"stem_en": "Geng",
"stem_ja": "庚",
"branch_en": "Chen",
"branch_ja": "辰",
"stem_branch_en": "Geng-Chen"
},
"hour_pillar_zi_shifted": {
"num": 16,
"name": "庚辰",
"element": "metal",
"stem_en": "Geng",
"stem_ja": "庚",
"branch_en": "Chen",
"branch_ja": "辰",
"stem_branch_en": "Geng-Chen"
}
}
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"date"
],
"properties": {
"date": {
"type": "string",
"description": "Birth date YYYY-MM-DD (JST). Year/month pillars use 立春/節入り boundaries (astronomical)."
},
"time": {
"type": "string",
"description": "Birth time HH:MM (JST 24h). Required for the hour pillar; also affects 子-hour day-pillar shift."
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}Captured payload 14 of 19
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://logigrain.net/api/nisa",
"mimeType": "application/json",
"description": "Japan new NISA limits: how much can still be bought this year and next year under the annual limits (つみたて 1.2M / 成長 2.4M yen) and the 18M-yen lifetime book-value limit (成長 up to 12M). Selling frees the book value (cost), not the sale price, from the next year. Returns the rule basis, assumptions, what would change the answer and a quotable sentence; asks for book values instead of guessing. Rules checked against the FSA NISA site."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"sale_price": "1500000",
"held_growth": "5000000",
"sold_growth": "1000000",
"bought_growth": "1000000",
"held_tsumitate": "3000000",
"bought_tsumitate": "600000"
}
},
"output": {
"type": "json",
"example": {
"nisa": {
"basis": {
"url": "https://www.fsa.go.jp/policy/nisa2/",
"year": 2026,
"rules": "2024年1月施行の新NISA(2026年10月時点で確認)",
"source": "金融庁 NISA特設ウェブサイト(新しいNISA:年間投資枠・非課税保有限度額・簿価残高方式、よくある質問)",
"as_of_date": "2026-10-19"
},
"next_year": {
"year": 2027,
"can_buy": {
"growth": 2400000,
"tsumitate": 1200000,
"combined_max": 3600000
},
"lifetime_remaining": 10000000,
"lifetime_used_book": 8000000,
"growth_lifetime_remaining": 7000000,
"recovered_from_sales_book": 1000000
},
"this_year": {
"note": "Sales made this year do not free any limit until next year, and do not restore this year's annual limit.",
"year": 2026,
"annual_used": {
"growth": 1000000,
"tsumitate": 600000
},
"can_still_buy": {
"growth": 1400000,
"tsumitate": 600000,
"combined_max": 2000000
},
"growth_used_book": 6000000,
"lifetime_remaining": 9000000,
"lifetime_used_book": 9000000,
"growth_lifetime_remaining": 6000000
},
"summary_en": "In 2026 you can still buy up to 2,000,000 yen (tsumitate up to 600,000, growth up to 1,400,000). On January 1, 2027, 1,000,000 yen of sold book value is recovered, leaving 10,000,000 yen of lifetim...",
"summary_ja": "2026年はあと最大2,000,000円(つみたて600,000円・成長1,400,000円まで)購入でき、2027年1月には売却分の簿価1,000,000円が戻って生涯枠の残りは10,000,000円、その年は最大3,600,000円まで購入できます(新NISAの制度、2026年10月時点で確認)。",
"sale_price_check": {
"sale_price": 1500000,
"explanation_en": "The limit freed next year is the book value sold (1,000,000 yen), not the sale price (1,500,000 yen).",
"explanation_ja": "売却額1,500,000円ではなく、売った分の取得価額(簿価)1,000,000円が翌年に戻ります。",
"recovered_book": 1000000
}
}
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"properties": {
"as_of": {
"type": "string",
"description": "Date YYYY-MM-DD (default today); its year is 'this year'"
},
"birth": {
"type": "string",
"description": "Optional birth date YYYY-MM-DD to check the age-18 requirement (as of January 1)"
},
"sale_price": {
"type": "string",
"description": "Optional: total sale price, to show that the limit freed is the book value, not the price"
},
"held_growth": {
"type": "string",
"description": "Book value (cost) of current 成長投資枠 holdings, yen"
},
"sold_growth": {
"type": "string",
"description": "Book value (cost) of 成長投資枠 holdings sold this year, yen"
},
"bought_growth": {
"type": "string",
"description": "成長投資枠 purchases this calendar year, yen (default 0)"
},
"held_tsumitate": {
"type": "string",
"description": "Book value (cost) of current つみたて投資枠 holdings, yen. Give this and/or held_growth"
},
"sold_tsumitate": {
"type": "string",
"description": "Book value (cost) of つみたて投資枠 holdings sold this year, yen"
},
"bought_tsumitate": {
"type": "string",
"description": "つみたて投資枠 purchases this calendar year, yen (default 0)"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}Captured payload 15 of 19
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://logigrain.net/api/nenkin",
"mimeType": "application/json",
"description": "Japanese public pension estimate (老齢基礎年金) using official parameters for the current fiscal year (FY2026 full amount 847,300 yen): exemptions, early claim/deferral rates, fuka-nenkin. Returns the rule year used and a quotable sentence; asks for the contribution record instead of guessing; warns when parameters are stale."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"paid": "456",
"birth": "1975-06-15",
"start_age": "67"
}
},
"output": {
"type": "json",
"example": {
"nenkin": {
"note": null,
"basis": {
"as_of_date": "2026-10-19",
"parameters": "令和8年度年金額改定(厚生労働省, 2026年4月分から。国民年金+1.9%)",
"fiscal_year": 2026
},
"eligible": true,
"adjustment": {
"kind": "deferral (kurisage) 24 months x +0.7%",
"rate": 0.168,
"start_age": 67,
"start_extra_months": 0
},
"summary_en": "Under FY2026 parameters, a person born 1975-06-15 with 456 paid months starting at 67 would receive about 940,164 yen per year (about 78,347 yen per month) o...",
"summary_ja": "令和8年度の基準で、1975年6月15日生まれ・保険料納付456か月の人が67歳から受け取る老齢基礎年金の年額は940,164円(月額約78,347円)の見込みです。",
"birth_class": "born 1956-04-02 or later",
"fiscal_year": 2026,
"fuka_annual": 0,
"kiso_annual": 940164,
"kosei_annual": null,
"total_annual": 940164,
"weighted_months": 456,
"qualifying_months": 456,
"full_amount_annual": 847300,
"total_monthly_approx": 78347
},
"stale_warning": null,
"parameter_source": "令和8年度年金額改定(厚生労働省, 2026年4月分から。国民年金+1.9%)"
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"birth"
],
"properties": {
"fuka": {
"type": "string",
"description": "Fuka-nenkin paid months (200 yen/month)"
},
"paid": {
"type": "string",
"description": "Paid contribution months (0-480)"
},
"birth": {
"type": "string",
"description": "Birth date YYYY-MM-DD (1941-04-02 or later)"
},
"karaki": {
"type": "string",
"description": "Karaki (合算対象期間) months (eligibility only)"
},
"student": {
"type": "string",
"description": "Student deferral months (counts toward eligibility only)"
},
"exempt_1q": {
"type": "string",
"description": "1/4 exemption months from 2009-04"
},
"exempt_3q": {
"type": "string",
"description": "3/4 exemption months from 2009-04"
},
"kosei_yen": {
"type": "string",
"description": "Optional annual kosei-nenkin amount (e.g. from nenkin teikibin); only the early/deferral rate is applied"
},
"start_age": {
"type": "string",
"description": "Claim start age 60-75 (default 65)"
},
"exempt_full": {
"type": "string",
"description": "Full exemption months from 2009-04"
},
"exempt_half": {
"type": "string",
"description": "Half exemption months from 2009-04"
},
"fiscal_year": {
"type": "string",
"description": "Parameter year (default latest)"
},
"exempt_1q_pre2009": {
"type": "string",
"description": "1/4 exemption months before 2009-04"
},
"exempt_3q_pre2009": {
"type": "string",
"description": "3/4 exemption months before 2009-04"
},
"start_extra_months": {
"type": "string",
"description": "Additional months 0-11"
},
"exempt_full_pre2009": {
"type": "string",
"description": "Full exemption months before 2009-04"
},
"exempt_half_pre2009": {
"type": "string",
"description": "Half exemption months before 2009-04"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}Captured payload 16 of 19
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://logigrain.net/api/housing-loan",
"mimeType": "application/json",
"description": "Japan mortgage tax deduction (住宅ローン控除) for move-ins 2026-2030 under the FY2026 reform: borrowing limit and 13/10-year period by new/resale/used, performance class, special household and floor area, dated transitional rules, yearly deduction or a full-period projection from a loan with the income-tax/resident-tax split. Refuses older move-ins instead of mixing rules; asks for missing facts. Rules checked against the National Tax Agency tax answers (law as of 2026-04-01) and cross-checked by an independent implementation."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"rate": "0.8",
"type": "new",
"move_in": "2026-04",
"kosodate": "yes",
"floor_area": "70",
"term_years": "35",
"loan_amount": "40000000",
"performance": "zeh"
}
},
"output": {
"type": "json",
"example": {
"housing_loan": {
"home": {
"type": "new",
"move_in": "2026-04",
"type_ja": "新築",
"performance": "zeh",
"floor_area_m2": 70,
"performance_ja": "ZEH水準省エネ住宅"
},
"basis": {
"rules": "令和8年度税制改正後の住宅ローン控除(2026〜2030年入居、令和8年4月1日現在の法令。2026年10月時点で確認)",
"as_of_date": "2026-10-19",
"move_in_year": 2026
},
"eligible": true,
"projection": {
"schedule": [
{
"year": 2026,
"deduction": 275300,
"year_end_balance": 39337995
},
{
"year": 2027,
"deduction": 268300,
"year_end_balance": 38338347
}
],
"monthly_payment": 109224,
"total_deduction": 3017000
},
"summary_en": "For a newly built ZEH-level energy-efficient home (70 m2) moving in 2026-04 (special household), the borrowing limit is 45,000,000 yen and the deduction lasts 13 years (2026-2038): each year 0.7% o...",
"summary_ja": "2026年4月入居の新築のZEH水準省エネ住宅(70㎡)(子育て・若者夫婦世帯)は、借入限度額4,500万円・控除期間13年(2026〜2038年分)で、各年の控除額は年末残高×0.7%、最大で年315,000円です。借入4,000万円・金利0.8%・35年の元利均等返済なら、13年間の控除額の合計は約3,017,000円の見込みです(税額が控除額より少ない年は全額は戻りません)。(令和8年度税制改正後の住宅ローン控除、2026年10月時点で確認)",
"deduction_rate": 0.007,
"borrowing_limit": 45000000,
"deduction_years": 13,
"deduction_period": {
"last_year": 2038,
"first_year": 2026
},
"special_household": true,
"max_deduction_per_year": 315000
}
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"move_in",
"type",
"performance",
"floor_area"
],
"properties": {
"rate": {
"type": "string",
"description": "Annual interest rate in percent (fixed), e.g. 0.8"
},
"type": {
"type": "string",
"description": "new (新築) | resale (買取再販) | used (中古/既存)"
},
"as_of": {
"type": "string",
"description": "Date for the rule basis, YYYY-MM-DD (default today)"
},
"price": {
"type": "string",
"description": "Home price (取得対価), yen: caps the counted balance"
},
"income": {
"type": "string",
"description": "Total income (合計所得金額), yen. Required for 40-50 m2 homes"
},
"move_in": {
"type": "string",
"description": "Move-in month YYYY-MM (or YYYY-MM-DD), 2026-01 to 2030-12"
},
"rebuild": {
"type": "string",
"description": "Rebuilding on the same site? yes | no (red-zone exception)"
},
"seismic": {
"type": "string",
"description": "Used home built before 1982: has a seismic-standard certificate? yes | no"
},
"kosodate": {
"type": "string",
"description": "Special household (子育て・若者夫婦世帯) on Dec 31 of the move-in year: yes | no. Required when it changes the limit"
},
"red_zone": {
"type": "string",
"description": "In a disaster red zone? yes | no (new homes moving in 2028+)"
},
"built_date": {
"type": "string",
"description": "Registered construction date YYYY-MM-DD (new homes' transitional rules; used homes before 1982)"
},
"floor_area": {
"type": "string",
"description": "Registered floor area in m2 (condos: private area). 40 or more"
},
"income_tax": {
"type": "string",
"description": "Annual income tax before the deduction, yen: splits the deduction between income tax and resident tax"
},
"term_years": {
"type": "string",
"description": "Loan term in years (10-50)"
},
"loan_amount": {
"type": "string",
"description": "Loan amount, yen: with rate and term_years, projects every year of the period"
},
"performance": {
"type": "string",
"description": "certified (認定長期優良・低炭素) | zeh (ZEH水準) | energy (省エネ基準適合) | other"
},
"permit_date": {
"type": "string",
"description": "Building confirmation date YYYY-MM-DD (needed for some new homes)"
},
"taxable_income": {
"type": "string",
"description": "Taxable income (課税総所得金額等), yen: resident-tax cap 5% (max 97,500 yen)"
},
"year_end_balance": {
"type": "string",
"description": "Year-end loan balance, yen: returns that year's deduction"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}Captured payload 17 of 19
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://logigrain.net/api/convert-unit",
"mimeType": "application/json",
"description": "Unit conversion: length, weight, speed, data, area, volume, energy, temperature."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"to": "mile",
"from": "kilometer",
"value": "100"
}
},
"output": {
"type": "json",
"example": {
"to": "mile",
"from": "kilometer",
"value": 100,
"result": 62.13711922,
"category": "length"
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"value",
"from",
"to"
],
"properties": {
"to": {
"type": "string",
"description": "Target unit (e.g. mile, fahrenheit)"
},
"from": {
"type": "string",
"description": "Source unit (e.g. kilometer, celsius)"
},
"value": {
"type": "string",
"description": "Value to convert"
},
"category": {
"type": "string",
"description": "Optional unit category (length, weight, speed, data, area, volume, energy); auto-detected if omitted"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}Captured payload 18 of 19
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://logigrain.net/api/nenkin-deferral",
"mimeType": "application/json",
"description": "When to start the Japanese public pension: break-even age of early claim or deferral versus a baseline, probability of living to that age from the official Japanese life table (令和7年簡易生命表, by sex), and expected lifetime total for each start age 60-75. Returns the rule year used, assumptions, what would change the answer, and a quotable sentence. Totals cross-checked by an independent implementation."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"sex": "male",
"birth": "1975-06-15",
"start_age": "70"
}
},
"output": {
"type": "json",
"example": {
"stale_warning": null,
"nenkin_deferral": {
"basis": {
"as_of_date": "2026-10-19",
"life_table": "令和7(2025)年簡易生命表(厚生労働省)",
"life_table_url": "https://www.mhlw.go.jp/toukei/saikin/hw/life/life25/index.html",
"life_table_year": 2025,
"pension_parameters": "令和8年度年金額改定(厚生労働省, 2026年4月分から。国民年金+1.9%) — full basic pension used because 'annual_65' was not given"
},
"person": {
"sex": "male",
"birth": "1975-06-15",
"age_at_as_of": 51.35,
"max_deferral_months": 120,
"early_rate_per_month": 0.004
},
"options": [
{
"start_age": 70,
"annual_amount": 1203166,
"adjustment_rate": 0.42,
"expected_total_yen": 16588461,
"start_age_label_ja": "70歳",
"start_extra_months": 0,
"break_even_vs_baseline": {
"meaning": "Starting at this age pays more in total than the baseline only if alive beyond the break-even age.",
"age_years": 81.9,
"age_label_en": "81 years 11 months",
"age_label_ja": "81歳11か月",
"prob_alive_at_break_even_pct": 59.7
},
"prob_alive_at_start_pct": 87.4,
"prob_this_option_pays_more_pct": 59.7
}
],
"baseline": {
"start_age": 65,
"annual_amount": 847300,
"adjustment_rate": 0,
"expected_total_yen": 15510001,
"start_age_label_ja": "65歳",
"start_extra_months": 0,
"prob_alive_at_start_pct": 93
},
"summary_en": "For a male born 1975-06-15, starting at 70 years instead of 65 years breaks even at 81 years 11 months; the probability of living to that age is about 59.7% ...",
"summary_ja": "1975年6月15日生まれの男性が70歳から受け取る場合、65歳開始との損益分岐は81歳11か月で、令和7(2025)年簡易生命表ではその年齢まで生きる確率は約59.7%です(額面・税と社会保険料は考慮せず)。",
"baseline_note": null,
"annual_amount_at_65": 847300,
"best_by_expected_total": {
"label_ja": "70歳",
"start_age": 70,
"start_extra_months": 0
}
}
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"birth",
"sex"
],
"properties": {
"sex": {
"type": "string",
"description": "male or female (life tables are by sex)"
},
"as_of": {
"type": "string",
"description": "Date the person is known to be alive, YYYY-MM-DD (default today)"
},
"birth": {
"type": "string",
"description": "Birth date YYYY-MM-DD (1941-04-02 or later)"
},
"annual_65": {
"type": "string",
"description": "Annual pension at 65 in yen (e.g. from nenkin teikibin). Default: full basic pension. Affects expected totals only"
},
"start_age": {
"type": "string",
"description": "Start age to evaluate (60-75). Omit to get all start ages"
},
"fiscal_year": {
"type": "string",
"description": "Pension parameter year (default latest)"
},
"baseline_age": {
"type": "string",
"description": "Age to compare against (default 65; moved to the next whole age if 65 is already past)"
},
"life_table_year": {
"type": "string",
"description": "Life table year (default latest)"
},
"start_extra_months": {
"type": "string",
"description": "Additional months 0-11"
},
"baseline_extra_months": {
"type": "string",
"description": "Additional months 0-11 for the baseline"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}Captured payload 19 of 19
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://logigrain.net/api/date",
"mimeType": "application/json",
"description": "Date difference, add days, Unix timestamp conversion, weekday count."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"end": "2026-12-31",
"start": "2026-01-01",
"action": "diff"
}
},
"output": {
"type": "json",
"example": {
"end": "2026-12-31",
"days": 364,
"start": "2026-01-01",
"action": "diff",
"direction": "forward"
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"properties": {
"end": {
"type": "string",
"description": "End date YYYY-MM-DD (diff/business)"
},
"days": {
"type": "string",
"description": "Days to add (action=add)"
},
"start": {
"type": "string",
"description": "Start date YYYY-MM-DD (diff/add/business)"
},
"action": {
"type": "string",
"description": "Operation (default diff)"
},
"timestamp": {
"type": "string",
"description": "Unix timestamp in seconds (action=unix)"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}Can I trust it score from our own monitoring
score from our own monitoring
#20 of 148 in Finance. Bands: strong 93+, solid 75+, mixed 55+, weak below 55.
- Reliability
- 100% uptime 30d
- Compliance
- A 14/14 checks pass
- Price
- $0.001 p9 in Finance
- Risk
- clean no risk flag
- Traction
- $0.00 30d 0 buyers
- Last change
- price changed 5d ago 3 in 30d
14/14 compliance checks
- 402 payload captured
- accepts[] array present
- payTo address recoverable
- payTo at accepts[0].payTo (conformant shape)
- payTo is a valid on-chain address
- atomic price declared
- atomic price in a sane range
- asset (token) address declared
- network resolves to CAIP-2
- payment scheme declared
- served over HTTPS
- declares the current x402 version (2)
- EIP-712 domain parameters present on every EVM entry
- x402 v2 envelope delivered in the payment-required header
402 terms unchanged since 2026-11-09. Last up 2026-11-14.
── Site signals
- homepage reachable
- openapi doc
- pricing page
- llms.txt
- robots.txt
- terms page
How the score works
What the score read on this service: status online, 100% uptime 30d, 151ms response p95, x402 compliance 14 of 14, $0.001 price against the category, on-chain traction measured. Each of those is measured, and each is published in full below.
The score comes from our own monitoring, never from reviews, operator claims, or a language model: reliability, x402 compliance, price against the category, a deterministic risk flag, and a small on-chain traction term, weighted by ranking generation 3. It is not placement anyone can buy: the paid verify tier is reported beside it and is not one of its inputs. Every component below stays published and read-only.
Bands on the 0 to 100 measured score: strong at 93 and above, solid from 75, mixed from 55, weak below 55. Price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, so the score places a service in its own field.
It is a score inside Finance, and only there: price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, which here means 148 listings, this one among them: the same 148 the position above is counted against. When the two differ, the field is the wider one, because a listing we have measured too little of to rank still sits in the field the price and the speed are normalized over. The same service in a different field would read differently. The same engine answers GET /api/v1/best, and asked for a different pool (the whole directory, or another filter) it returns a different number for this service under this same ranking generation. Neither is more correct: they answer different questions, and the methodology states which is which.
Traction is a conservative undercount; first settlement seen 2026-06-27.
All measured facts
What it does
Exact calculation tools for AI agents, paid per call with x402 (0.001 USDC on Base). Japanese rules that change every year and that LLMs often get wrong: public pension amount and start-age break-even with survival probability from the official life table, new NISA remaining limits, and the mortgage tax deduction (2026-2030 move-ins). Each answer states which year's rules it used, asks for missing facts instead of guessing, and includes a quotable sentence. Also: astronomy and calendar (moon phase, Japanese era, Western natal chart, Four Pillars, Nine Star Ki, Zi Wei Dou Shu) and general utilities (compound interest, currency and unit conversion, date math, exact combinatorics).
LogiGrain is a listed x402 Finance API. Captured payment terms name Base. Monitoring and settlement figures below describe the observations available to this directory; an unpaid HTTP 402 check does not prove that a paid call will deliver.
Assessment computed at . Latest service check observed at . Service data JSON · Measurement methodology.
Page rendered at . This response time is separate from the observation and computation times attached to each measurement.
Latest endpoint observation: . Latest price capture: . Prices are recorded quotes, not a promise of availability. Token assets and payment terms are listed separately. Endpoint data JSON · Price history JSON · Measurement methodology.
Assessment computed at . Uptime uses the stated daily-rollup window; response times are in milliseconds, compliance is passed/evaluated checks, and traction is a measured settlement floor. The comparison score is out of 100 within this category. Assessment JSON · Measurement methodology.
Observed daily coverage: 2026-10-16 to 2026-11-14 UTC. Daily monitoring and settlement rollups do not expose their computation time; a bucket date is not an update timestamp. Latest settlement in the assessment: . Uptime and response JSON · Volume JSON · Buyers JSON · Measurement methodology.
Ranked from the measured category pool, refreshed at most once a minute. The comparison has no persisted computation timestamp; the assessment time above belongs to this service only. Ranking API documentation · Ranking methodology.
x402 List home · Services · Finance
- uptime · latest daily rollup
- 100%
- uptime 7d
- 100%
- uptime 30d
- 100%
- uptime 90d
- 100%
- response p95
- 151ms
- avg response
- 209ms
- total checks
- 4,358
Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.
- price (min)
- $0.001
- category percentile (min)
- p9 in Finance
- endpoints / prices
- 19 / 1
- model
- flat
- stability
- 0%
No deterministic risk flag. Risk fires only on an exact blocklist match, or a reserved-brand name with a mismatched verified payTo. Never from low uptime, a high price, or a model guess.
- domain age
- 197d
- registrar
- Cloudflare, Inc.
- hosting
- custom
- domain created
- 2026-04-28
Identity facts, not a risk score.
- assessment volume 30d
- $0.00
- exact assessment volume 30d (USD)
- 0
- assessment recorded at (UTC)
- 2026-11-14T02:53:28.037Z
- buyers 30d
- 0
- settlements 30d
- 0
- measured since
- 2026-06-27 (start of our harvest window)
- last settlement
- 2026-09-24
- top buyer share
- -
- top 3 buyers share
- -
- concentrated volume
- no
- trend 7d vs 30d
- -
- networks
- eip155:8453
- volume all-time
- $0.51
- settlements all-time
- 509
- median settlement 30d
- -
- max settlement 30d
- -
Assessment volume uses the latest 30d assessment. Over time sums daily address snapshots, rounded to cents and refreshed separately. The two sources can differ in timing, precision and shared-address attribution. Amounts use cents for comparison; known sub-cent values keep up to 12 significant digits. The exact stored assessment value is shown above.
Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.
Top buyer share lowers the on-chain traction part of the ranking score behind this page's verdict and /best, by up to half when one address holds all 30d volume. The Recommended and Highest volume sorts of the services list do not use it; they use the Concentrated volume rule instead.
- member since
- 2026-07-01
Recent checks
| Checked at (UTC) | Status | HTTP | Response | Endpoints |
|---|---|---|---|---|
| Online | 402 | 94ms | 19 | |
| Online | 402 | 107ms | 19 | |
| Online | 402 | 89ms | 19 | |
| Online | 402 | 49ms | 19 | |
| Online | 402 | 94ms | 19 | |
| Online | 402 | 85ms | 19 | |
| Online | 402 | 80ms | 19 | |
| Online | 402 | 74ms | 19 | |
| Online | 402 | 104ms | 19 | |
| Online | 402 | 60ms | 19 | |
| Online | 402 | 91ms | 19 | |
| Online | 402 | 113ms | 19 | |
| Online | 402 | 104ms | 19 | |
| Online | 402 | 70ms | 19 | |
| Online | 402 | 126ms | 19 | |
| Online | 402 | 120ms | 19 | |
| Online | 402 | 100ms | 19 | |
| Online | 402 | 73ms | 19 |
Changes3 in 30d
| Observed at (UTC) | Change | Evidence |
|---|---|---|
| price changed |
| |
| price changed |
| |
| schema changed | endpoint added endpoint added endpoint added endpoint added endpoint added endpoint added endpoint added endpoint added endpoint added endpoint added endpoint added endpoint added endpoint added endpoint added endpoint added schema added schema added schema added schema added schema added schema added schema added schema added schema added schema added schema added schema added schema added schema added schema added |
Amounts are on-wire atomic units in the named asset.
Over time
- Volume 30d
- $0.00
- Uptime
- 100% on all 29 completed days
More charts
10-16 to 11-14* UTC
Scores over time
10-16 to 11-14* UTC
10-16 to 11-14* UTC
10-16 to 11-14* UTC
Scores: one day per column, 10-16 to 11-14*, on the columns of Response time. Uptime held 100% every day in this window, including any partial day. Daily readings remain in the Uptime strip and Values. The checklist grew from 11 to 14 checks on 2026-07-28, before this window. Pillar lines use their own low and high. Exact dated readings are available in each readout and in Values.
Each series spans only the dates it has data for. Every series is also served as JSON at /api, /scores, /volume and /buyers.
Values
* today so far, partial (UTC).
The uptime summary counts completed UTC days only. The strip, readouts and table retain today's partial reading.
Daily snapshot total, 30d: $0.02, peak $0.01 on 11-09. The visible 30d total in Traction comes from the latest assessment. These sources can differ in their window, refresh time, cent rounding and shared-address attribution.
Daily address snapshots: 2026-10-16 to 2026-11-14 UTC; * today so far, partial (UTC). Daily snapshots store cents. A recorded $0.00 with settlements cannot distinguish exact zero from volume rounded away. Lost precision is unavailable here. † marks a recorded $0.00 with settlements.
Settlement volume uses the stored USD valuation of tracked payments; it is distinct from token quantities. USD-pegged assets are valued at 1 USD per token in these rollups. The measured settlement floor does not cover all payments to this service.
Assessment history last recorded at . Each UTC day uses its last recorded run; missing readings stay unmeasured. Assessment history JSON · Measurement methodology.
| Day | Volume | Buyers | Settlements | Uptime | Response | Compliance | Price percentile | Site signals |
|---|---|---|---|---|---|---|---|---|
| 2026-10-16 | no data | no data | no data | 100% | 225.70ms | 14/14 | p13 | 4/6 |
| 2026-10-17 | no data | no data | no data | 100% | 192.33ms | 14/14 | p13 | 4/6 |
| 2026-10-18 | no data | no data | no data | 100% | 165.75ms | 14/14 | p13 | 4/6 |
| 2026-10-19 | no data | no data | no data | 100% | 211.21ms | 14/14 | p12 | 4/6 |
| 2026-10-20 | no data | no data | no data | 100% | 237.87ms | 14/14 | p12 | 4/6 |
| 2026-10-21 | no data | no data | no data | 100% | 179.10ms | 14/14 | p12 | 4/6 |
| 2026-10-22 | no data | no data | no data | 100% | 265.13ms | 14/14 | p12 | 4/6 |
| 2026-10-23 | no data | no data | no data | 100% | 178.71ms | 14/14 | p12 | 4/6 |
| 2026-10-24 | no data | no data | no data | 100% | 127.74ms | 14/14 | p12 | 4/6 |
| 2026-10-25 | no data | no data | no data | 100% | 209.88ms | 14/14 | p12 | 4/6 |
| 2026-10-26 | no data | no data | no data | 100% | 271.91ms | 14/14 | p12 | 4/6 |
| 2026-10-27 | no data | no data | no data | 100% | 250.44ms | 14/14 | p11 | 4/6 |
| 2026-10-28 | no data | no data | no data | 100% | 187.57ms | 14/14 | p11 | 4/6 |
| 2026-10-29 | no data | no data | no data | 100% | 204.60ms | 14/14 | p11 | 4/6 |
| 2026-10-30 | no data | no data | no data | 100% | 213.40ms | 14/14 | p11 | 4/6 |
| 2026-10-31 | no data | no data | no data | 100% | 274.26ms | 14/14 | p10 | 4/6 |
| 2026-11-01 | no data | no data | no data | 100% | 212.28ms | 14/14 | p10 | 4/6 |
| 2026-11-02 | no data | no data | no data | 100% | 174.64ms | 14/14 | p10 | 4/6 |
| 2026-11-03 | no data | no data | no data | 100% | 218.47ms | 14/14 | p10 | 4/6 |
| 2026-11-04 | no data | no data | no data | 100% | 226.03ms | 14/14 | p9 | 4/6 |
| 2026-11-05 | no data | no data | no data | 100% | 166.90ms | 14/14 | p9 | 4/6 |
| 2026-11-06 | no data | no data | no data | 100% | 158.93ms | 14/14 | p9 | 4/6 |
| 2026-11-07 | no data | no data | no data | 100% | 161.31ms | 14/14 | p9 | 4/6 |
| 2026-11-08 | no data | no data | no data | 100% | 86.46ms | 14/14 | p9 | 4/6 |
| 2026-11-09 | $0.01 | 3 | 6 | 100% | 130.24ms | 14/14 | p9 | 4/6 |
| 2026-11-10 | $0.01 | 4 | 6 | 100% | 111.68ms | 14/14 | p9 | 4/6 |
| 2026-11-11 | $0.00 recorded† | 1 | 1 | 100% | 113.82ms | 14/14 | p9 | 4/6 |
| 2026-11-12 | no data | no data | no data | 100% | 100.89ms | 14/14 | p9 | 4/6 |
| 2026-11-13 | no data | no data | no data | 100% | 109.46ms | 14/14 | p9 | 4/6 |
| 2026-11-14* | no data | no data | no data | 100% | 91.25ms | 14/14 | p9 | 4/6 |
Alternatives in Finance
5 of 147 other ranked services in Finance, ordered by the same measured score.
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Update this listingEarn the verified tier: x402list pays a real call to this endpoint and, if it delivers, the service is delivery-verified. The fee covers the cost of the probe, not the badge; there is no refund if the call does not deliver. Agent and API only, no in-browser signing. See /api.
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Delisting
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