payment-ready until 2026-09-30
imported from the x402 Bazaar, not submitted by the operator · own this service? claim it · or ask to be removed
Pay-per-call web search and web data for AI agents. Multi-engine SERP (web + news, batch, rank-fused), search-and-read (top hits to markdown in one call), URL-to-markdown scraping, Google Trends (interest over time, related queries/topics, by region), structured data (WHOIS/DNS, enrichment, SEC filings, crypto/DeFi, geocoding, weather) and academic search (papers, references, cited-by, lit-review). 43 endpoints, USDC on Base, no key, no signup.
Pay from $0.005 to $0.15 per request in USDC on Base, settled onchain via the x402 protocol, no signup, no API key needed.
measured since 2026-06-21 (start of our harvest window) · $181.89 all-time · settled via coinbase
VERDICT
ranking generation 3solid 84/100 #135 of 316 in Data by measured score
What the score read on this service: status degraded, 96.6% uptime 30d, 250ms response p95, x402 compliance 14 of 14, $0.005 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.
It is a score inside Data, 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 316 listings, this one among them. That set is wider than the 316 the position above is counted against, 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.
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.
ALTERNATIVES IN DATA
Other Data services in this directory, ordered by the same measured score. The figures are ours: 30-day uptime from our own probes, 30-day settlement volume read on-chain (a conservative undercount, and null where we cannot measure it, never a zero).
| SERVICE | BAND | SCORE | UPTIME 30D | VOL 30D |
|---|---|---|---|---|
| StableEnrich | strong | 96 | 100% | $2.0k |
| glim.sh | strong | 95 | 100% | $47.37 |
| SniperX•x402 | strong | 95 | 100% | $326.57 |
| cn402 | strong | 94 | 100% | $36.42 |
| API Acre | solid | 92 | 99.5% | $31.95 |
ASSESSMENT
updated 4h agoThe parts the verdict above is computed from, each with its proof. Click any chip. Measured values stay read-only; unknown is honest, and an unknown is never counted as a zero.
reliability 96.6%
- uptime 24h
- 76%
- uptime 7d
- 85%
- uptime 30d
- 96.6%
- uptime 90d
- 98.4%
- response p95
- 250ms
- avg response
- 252ms
- total checks
- 2,759
Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.
compliance A (14/14)
14 of 14 x402 conformance checks pass. Full checklist below.
price $0.005 to $0.15 (p40 in Data)
- price (min)
- $0.005
- price (max)
- $0.15
- category percentile (min)
- p40 in Data
- category percentile (max)
- p79 in Data
- endpoints / prices
- 43 / 9
- model
- tiered
- stability
- 0%
risk clean
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
- -
- registrar
- -
- hosting
- custom
- domain created
- ---
Identity facts, not a risk score.
traction $139.345 30d · 58 buyers · top buyer 91%
- volume 30d
- $139.345
- buyers 30d
- 58
- settlements 30d
- 4,127
- measured since
- 2026-06-21 (start of our harvest window)
- last settlement
- 2026-09-22
- top buyer share
- 91% of 30d volume
- trend 7d vs 30d
- 0.60x the 30d daily rate
- networks
- eip155:8453
- volume all-time
- $181.89
- settlements all-time
- 5,926
- median settlement 30d
- $0.03
- max settlement 30d
- $0.10
- settled via
- coinbase ($139.34, 4,127 tx)
Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.
Top buyer share is a concentration signal, not part of the ranking score.
CHANGES
2 in 30dPayout, price, and schema changes detected on this service's x402 wire. A payout rotation at an unchanged price shows up here even when nothing else moves. Full feed at /changes.
changes price changed 14d ago (2 in 30d)
price changed · 14d ago
GET /v1/serp · eip155:8453 · USDC: 30000 → 50000
schema changed · 15d ago
endpoint added GET /v1/author-search
endpoint added GET /v1/congress-trades
endpoint added GET /v1/cve
endpoint added GET /v1/defi-tvl
endpoint added GET /v1/dns-propagation
endpoint added GET /v1/domain-info
endpoint added GET /v1/email-validate
endpoint added GET /v1/enrich
endpoint added GET /v1/fda
endpoint added GET /v1/gas-oracle
endpoint added GET /v1/interest-by-region
endpoint added GET /v1/lit-review
endpoint added GET /v1/market-sentiment
endpoint added GET /v1/nutrition
endpoint added GET /v1/paper-details
endpoint added GET /v1/papers
endpoint added GET /v1/permits
endpoint added GET /v1/recalls
endpoint added GET /v1/related-papers
endpoint added GET /v1/related-queries
endpoint added GET /v1/related-topics
endpoint added GET /v1/serp
endpoint added GET /v1/smart-search
endpoint added GET /v1/stablecoins
endpoint added GET /v1/stackoverflow
endpoint added GET /v1/token-price
endpoint added GET /v1/topic-search
endpoint added GET /v1/trend
endpoint added GET /v1/trending-coins
endpoint added GET /v1/usgs-quakes
endpoint added GET /v1/weather
endpoint added GET /v1/whois-bulk
endpoint added GET /v1/yield-pools
schema added GET /v1/author-search exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/congress-trades exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/cve exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/defi-tvl exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/dns-propagation exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/domain-info exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/email-validate exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/enrich exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/fda exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/gas-oracle exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/interest-by-region exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/lit-review exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/market-sentiment exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/nutrition exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/paper-details exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/papers exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/permits exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/recalls exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/related-papers exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/related-queries exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/related-topics exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/serp exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/smart-search exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/stablecoins exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/stackoverflow exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/token-price exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/topic-search exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/trend exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/trending-coins exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/usgs-quakes exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/weather exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/whois-bulk exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
schema added GET /v1/yield-pools exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}
Amounts are on-wire atomic units in the named asset.
WHAT IT DOES
ai-derivedNo AI synthesis has been produced for this service yet.
ENDPOINTS
| METHOD | PATH | DESCRIPTION | PRICE | NETWORK | ASSET | 402 CHANNEL |
|---|---|---|---|---|---|---|
| GET | /v1/author-search | $0.02 | Base | USDC | header | |
| GET | /v1/congress-trades | $0.05 | Base | USDC | header | |
| GET | /v1/cve | $0.01 | Base | USDC | header | |
| GET | /v1/defi-tvl | $0.02 | Base | USDC | header | |
| GET | /v1/dns-propagation | $0.03 | Base | USDC | header | |
| GET | /v1/domain-info | $0.02 | Base | USDC | header | |
| GET | /v1/email-validate | $0.03 | Base | USDC | header | |
| GET | /v1/enrich | $0.15 | Base | USDC | header | |
| GET | /v1/fda | $0.02 | Base | USDC | header | |
| GET | /v1/gas-oracle | $0.01 | Base | USDC | header | |
| GET | /v1/geocode | $0.01 | Base | USDC | header | |
| GET | /v1/github | $0.02 | Base | USDC | header | |
| GET | /v1/hackernews | $0.01 | Base | USDC | header | |
| GET | /v1/interest-by-region | $0.03 | Base | USDC | header | |
| GET | /v1/lit-review | $0.08 | Base | USDC | header | |
| GET | /v1/market-sentiment | $0.05 | Base | USDC | header | |
| GET | /v1/nutrition | $0.01 | Base | USDC | header | |
| GET | /v1/paper-details | $0.03 | Base | USDC | header | |
| GET | /v1/paper-fulltext | $0.04 | Base | USDC | header | |
| GET | /v1/papers | $0.02 | Base | USDC | header | |
| GET | /v1/permits | $0.03 | Base | USDC | header | |
| GET | /v1/recalls | $0.02 | Base | USDC | header | |
| GET | /v1/related-papers | $0.03 | Base | USDC | header | |
| GET | /v1/related-queries | $0.03 | Base | USDC | header | |
| GET | /v1/related-topics | $0.03 | Base | USDC | header | |
| GET | /v1/scrape | $0.03 | Base | USDC | header | |
| GET | /v1/sec-edgar | $0.05 | Base | USDC | header | |
| GET | /v1/serp | $0.05 | Base | USDC | header | |
| GET | /v1/serp-batch | $0.10 | Base | USDC | header | |
| GET | /v1/serp-multi | $0.05 | Base | USDC | header | |
| GET | /v1/serp-read | $0.08 | Base | USDC | header | |
| GET | /v1/smart-search | $0.02 | Base | USDC | header | |
| GET | /v1/stablecoins | $0.02 | Base | USDC | header | |
| GET | /v1/stackoverflow | $0.01 | Base | USDC | header | |
| GET | /v1/token-price | $0.01 | Base | USDC | header | |
| GET | /v1/topic-search | $0.02 | Base | USDC | header | |
| GET | /v1/trend | $0.05 | Base | USDC | header | |
| GET | /v1/trending-coins | $0.01 | Base | USDC | header | |
| GET | /v1/usgs-quakes | $0.005 | Base | USDC | header | |
| GET | /v1/weather | $0.005 | Base | USDC | header | |
| GET | /v1/website-audit | $0.08 | Base | USDC | header | |
| GET | /v1/whois-bulk | $0.05 | Base | USDC | header | |
| GET | /v1/yield-pools | $0.03 | Base | USDC | header |
REQUEST / RESPONSE EXAMPLE
An unpaid request to GET /v1/author-search returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.
curl -i 'https://api.kadec0.xyz/v1/author-search'
// 402 response (captured by monitor) · 43 payloads · click to expand
[
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA",
"amount": "50000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.kadec0.xyz/v1/serp",
"tags": [
"search",
"web-search",
"web",
"serp",
"search-results"
],
"mimeType": "application/json",
"description": "Web search results (SERP). Keyless web search returning ranked title, URL, and snippet for a query — with locale/region targeting, freshness filters (past day, week, month, year), pagination, a news mode that adds publish date and source, and selectable backend engine (auto rotation, or pin Brave, Yahoo, or Yandex).",
"serviceName": "Web Search (SERP)"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"q": "best python web scraping library",
"num_results": "10"
}
},
"output": {
"type": "json",
"example": {
"count": 1,
"items": [
{
"url": "https://example.com/tutorial",
"rank": 1,
"type": "search_result",
"title": "Python Web Scraping Tutorial",
"snippet": "Learn how to scrape data..."
}
]
}
}
},
"schema": {
"type": "object",
"$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",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"q"
],
"properties": {
"q": {
"type": "string",
"description": "search query"
},
"mode": {
"enum": [
"web",
"news"
],
"type": "string",
"default": "web",
"description": "web results or recent news (news adds date+source per item). the news index is narrow, so a long or highly specific news query that matches nothing falls through to web rather than returning empty; those items carry requestedMode=news and servedBy=web"
},
"page": {
"type": "string",
"default": "1",
"description": "result page (pagination)"
},
"engine": {
"type": "string",
"default": "auto",
"description": "search backend: auto (recommended - rotates engines and falls back on blocks) or pin one of yahoo, yandex (web mode); news mode supports bing. when set, each result carries an 'engine' field; if the pinned engine returns nothing, auto serves instead and results also carry 'requestedEngine'"
},
"region": {
"type": "string",
"default": "us-en",
"description": "locale, e.g. us-en, uk-en, de-de"
},
"timelimit": {
"enum": [
"d",
"w",
"m",
"y"
],
"type": "string",
"description": "restrict to past day/week/month/year"
},
"safesearch": {
"enum": [
"on",
"moderate",
"off"
],
"type": "string",
"default": "moderate"
},
"num_results": {
"type": "string",
"default": "10",
"description": "max results, cap 25"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.kadec0.xyz/v1/usgs-quakes",
"tags": [
"usgs",
"earthquakes",
"seismology",
"geological",
"government"
],
"mimeType": "application/json",
"description": "Real-time earthquake feed. Recent seismic events from USGS with magnitude, location, depth, and tsunami flag, filterable by magnitude, time, and radius.",
"serviceName": "USGS Earthquake Feed"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"starttime": "2026-06-18",
"minmagnitude": "4.5"
}
},
"output": {
"type": "json",
"example": {
"count": 1,
"items": [
{
"type": "earthquake",
"place": "10 km S of Kastri, Greece",
"depthKm": 10,
"tsunami": 0,
"latitude": 34.74,
"longitude": 24.1,
"magnitude": 5.2
}
]
}
}
},
"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",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [],
"properties": {
"limit": {
"type": "string",
"default": "50"
},
"endtime": {
"type": "string",
"description": "ISO date/time"
},
"latitude": {
"type": "string",
"description": "radius search center lat (needs longitude+maxradiuskm)"
},
"longitude": {
"type": "string"
},
"starttime": {
"type": "string",
"description": "ISO date/time (default: 24h ago)"
},
"maxradiuskm": {
"type": "string"
},
"minmagnitude": {
"type": "string",
"default": "2.5"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.kadec0.xyz/v1/weather",
"tags": [
"weather",
"forecast",
"air-quality",
"meteorology",
"climate"
],
"mimeType": "application/json",
"description": "Weather forecast and air quality for any location worldwide. Returns current conditions plus a 16-day daily weather forecast - temperature highs and lows, precipitation, and wind - alongside air-quality readings including AQI, PM2.5, PM10, and ozone, for any latitude and longitude. Daily forecast resolution. Keyless, via Open-Meteo.",
"serviceName": "Weather Forecast & Air Quality"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"lat": "52.52",
"lng": "13.41",
"forecast_days": "3"
}
},
"output": {
"type": "json",
"example": {
"count": 1,
"items": [
{
"type": "weather",
"current": {
"condition": "Overcast",
"temperature": 23.2
},
"forecast": [
{
"date": "2026-06-21",
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"payTo": "0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA",
"amount": "50000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.kadec0.xyz/v1/market-sentiment",
"tags": [
"fear-greed",
"market-sentiment",
"vix",
"crypto",
"stocks"
],
"mimeType": "application/json",
"description": "Market fear & greed index. Aggregated investor sentiment from CNN Fear & Greed, the crypto Fear & Greed index, and the VIX volatility gauge.",
"serviceName": "Market Fear & Greed Index"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"asset_class": "all"
}
},
"output": {
"type": "json",
"example": {
"count": 1,
"items": [
{
"vix": {
"level": "normal",
"value": 16.78,
"source": "cboe_vix"
},
"type": "market_sentiment",
"crypto": {
"label": "Extreme Fear",
"score": 23,
"source": "alternative.me",
"trend7d": {
"change": -5
}
},
"stocks": {
"label": "fear",
"score": 37.26,
"source": "cnn"
},
"assetClass": "all"
}
]
}
}
},
"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",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [],
"properties": {
"asset_class": {
"enum": [
"crypto",
"stocks",
"all"
],
"type": "string",
"default": "all"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA",
"amount": "50000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.kadec0.xyz/v1/whois-bulk",
"tags": [
"whois",
"bulk",
"domain",
"registrar",
"batch"
],
"mimeType": "application/json",
"description": "Bulk WHOIS lookup. Registrar, dates, and nameservers for up to 10 domains in a single batch call.",
"serviceName": "Bulk WHOIS Lookup"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"domains": "example.com,google.com,github.com"
}
},
"output": {
"type": "json",
"example": {
"count": 2,
"items": [
{
"type": "whois",
"whois": {
"registrar": "..."
},
"domain": "example.com"
},
{
"type": "whois",
"whois": {
"registrar": "MarkMonitor Inc."
},
"domain": "google.com"
}
]
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"domains"
],
"properties": {
"domains": {
"type": "string",
"description": "comma list of up to 10 domains"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA",
"amount": "30000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.kadec0.xyz/v1/dns-propagation",
"tags": [
"dns",
"propagation",
"resolvers",
"nameservers",
"domain"
],
"mimeType": "application/json",
"description": "DNS propagation checker. Compares a DNS record across public resolvers (Google, Cloudflare, Quad9, OpenDNS) to spot propagation lag or split-horizon answers.",
"serviceName": "DNS Propagation Checker"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"domain": "example.com",
"record_type": "A"
}
},
"output": {
"type": "json",
"example": {
"count": 4,
"items": [
{
"records": [
"93.184.216.34"
],
"resolver": "google",
"consistent": true,
"recordType": "A",
"resolverIp": "8.8.8.8"
}
]
}
}
},
"schema": {
"type": "object",
"$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",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"domain"
],
"properties": {
"domain": {
"type": "string"
},
"record_type": {
"enum": [
"A",
"AAAA",
"CNAME",
"MX",
"NS",
"TXT"
],
"type": "string",
"default": "A"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA",
"amount": "30000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.kadec0.xyz/v1/interest-by-region",
"tags": [
"google-trends",
"trends",
"interest-by-region",
"regional",
"geo"
],
"mimeType": "application/json",
"description": "Google Trends interest by region for a keyword. Returns the subregional breakdown of Google Trends search interest inside a country - by state, province, or region - each ranked 0-100 relative to the strongest region. For regional demand mapping, geo targeting, and finding where a keyword over-indexes before spending on it.",
"serviceName": "Google Trends Interest by Region"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"geo": "US",
"keyword": "bitcoin"
}
},
"output": {
"type": "json",
"example": {
"count": 1,
"items": [
{
"geo": "US",
"type": "google_trends_interest_by_region",
"stale": false,
"keyword": "bitcoin",
"regions": [
{
"value": 100,
"region": "Wyoming",
"regionCode": "US-WY"
},
{
"value": 47,
"region": "Nevada",
"regionCode": "US-NV"
}
],
"queriedAt": "2026-09-02T19:38:34Z",
"timeframe": "past_12_months",
"dataSource": "primary"
}
]
}
}
},
"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",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"keyword",
"geo"
],
"properties": {
"geo": {
"type": "string",
"description": "ISO-3166 alpha-2 country code, e.g. US, GB, DE, JP (213 countries supported)"
},
"keyword": {
"type": "string",
"description": "the search term"
},
"timeframe": {
"enum": [
"2004_present",
"past_12_months",
"past_30_days",
"past_4_hours",
"past_5_years",
"past_7_days",
"past_90_days",
"past_day",
"past_hour"
],
"type": "string",
"default": "past_12_months",
"description": "time window. Each response reports its own bucket size in `granularity`: past_30_days and past_90_days return a daily series, past_12_months and past_5_years weekly, windows under a day hourly"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA",
"amount": "20000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.kadec0.xyz/v1/domain-info",
"tags": [
"whois",
"dns",
"domain",
"registrar",
"nameservers"
],
"mimeType": "application/json",
"description": "Domain WHOIS and DNS lookup. Registrar, creation and expiry dates, nameservers, and full DNS records (A, AAAA, MX, NS, TXT, CNAME) for a domain.",
"serviceName": "Domain WHOIS & DNS Lookup"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"domain": "example.com"
}
},
"output": {
"type": "json",
"example": {
"count": 1,
"items": [
{
"dns": {
"A": [
"93.184.216.34"
]
},
"type": "domain_info",
"whois": {
"registrar": "..."
},
"domain": "example.com"
}
]
}
}
},
"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",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"domain"
],
"properties": {
"domain": {
"type": "string"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA",
"amount": "30000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.kadec0.xyz/v1/yield-pools",
"tags": [
"yield",
"apy",
"defi",
"yield-farming",
"defillama"
],
"mimeType": "application/json",
"description": "DeFi yield and APY across pools. Returns the top yield-farming pools via DefiLlama with current APY, base and reward APY split, TVL, chain, and project, filterable by chain, project, symbol, stablecoin-only, minimum TVL, and minimum APY. For yield discovery and comparing APY across protocols. Keyless.",
"serviceName": "DeFi Yield & APY Pools"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"chain": "Ethereum",
"minTvl": "5000000",
"maxItems": "10",
"stablecoin": "true"
}
},
"output": {
"type": "json",
"example": {
"count": 1,
"items": [
{
"apy": 2.284,
"type": "yield_pool",
"chain": "Ethereum",
"ilRisk": "no",
"symbol": "STETH",
"tvlUsd": 15508339626,
"apyBase": 2.284,
"project": "lido",
"exposure": "single",
"stablecoin": 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",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [],
"properties": {
"chain": {
"type": "string",
"description": "e.g. Ethereum|Arbitrum|Solana"
},
"minApy": {
"type": "string",
"default": "0"
},
"minTvl": {
"type": "string",
"default": "1000000"
},
"symbol": {
"type": "string",
"description": "pool symbol substring, e.g. USDC|ETH"
},
"project": {
"type": "string",
"description": "e.g. aave-v3|lido|uniswap-v3"
},
"maxItems": {
"type": "string",
"default": "25"
},
"stablecoin": {
"type": "string",
"description": "true -> stablecoin pools only"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA",
"amount": "20000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.kadec0.xyz/v1/recalls",
"tags": [
"consumer-recalls",
"cpsc",
"product-safety",
"nhtsa",
"government"
],
"mimeType": "application/json",
"description": "Consumer product recalls. A normalized multi-agency recall feed spanning FDA, CPSC, and NHTSA — product, reason, company, classification, and severity.",
"serviceName": "Consumer Product Recalls"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"q": "salmonella",
"limit": "10",
"agency": "all"
}
},
"output": {
"type": "json",
"example": {
"count": 1,
"items": [
{
"date": "2026-05-12",
"type": "recall",
"agency": "FDA",
"reason": "undeclared milk",
"status": "Ongoing",
"company": "...",
"product": "...",
"severity": "high",
"recallNumber": "F-1234-2026",
"classification": "Class I"
}
]
}
}
},
"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",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [],
"properties": {
"q": {
"type": "string",
"description": "search text. For agency=nhtsa pass '<make> <model> <year>'"
},
"limit": {
"type": "string",
"default": "25"
},
"agency": {
"enum": [
"fda",
"cpsc",
"nhtsa",
"all"
],
"type": "string",
"default": "all",
"description": "usda/FSIS is unavailable (agency blocks bots)"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA",
"amount": "80000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.kadec0.xyz/v1/lit-review",
"tags": [
"literature-review",
"citations",
"cited-by",
"systematic-review",
"research-map"
],
"mimeType": "application/json",
"description": "Literature review map in one call. Give a seed paper (DOI, arXiv id, OpenAlex id, or PMID) or a topic query and get one structured result: the seed's references, its cited-by list (most-cited first), and semantically related work, deduplicated into one uniform table with title, authors, year, venue, DOI, and citation count. Collapses search, citation lookup, and related-paper discovery into a single call. Keyless.",
"serviceName": "Literature Review Map"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"doi": "10.48550/arXiv.1706.03762",
"maxItems": "10"
}
},
"output": {
"type": "json",
"example": {
"count": 1,
"items": [
{
"seed": {
"year": 2017,
"title": "Attention Is All You Need",
"citationCount": 181057
},
"type": "lit_review",
"counts": {
"total": 30,
"citedBy": 10,
"related": 10,
"references": 10
},
"citedBy": [
{
"year": 2019,
"title": "BERT",
"relation": "cited_by"
}
],
"references": [
{
"year": 2014,
"title": "Neural Machine Translation",
"relation": "reference"
}
]
}
]
}
}
},
"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",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"anyOf": [
{
"required": [
"id"
]
},
{
"required": [
"doi"
]
},
{
"required": [
"q"
]
}
],
"required": [],
"properties": {
"q": {
"type": "string",
"description": "topic query (seed = top hit); use this OR id/doi"
},
"id": {
"type": "string",
"description": "seed paper: arXiv id, DOI, OpenAlex id, or PMID"
},
"doi": {
"type": "string",
"description": "alias for id (DOI form)"
},
"maxItems": {
"type": "string",
"default": "10",
"description": "max nodes per section (1-25)"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA",
"amount": "20000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.kadec0.xyz/v1/topic-search",
"tags": [
"topic-search",
"field-search",
"research-field",
"paper-discovery",
"openalex-topics"
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"engines"
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"properties": {
"q": {
"type": "string",
"description": "search query"
},
"mode": {
"enum": [
"web",
"news"
],
"type": "string",
"default": "web"
},
"region": {
"type": "string",
"default": "us-en",
"description": "locale, e.g. us-en, uk-en, de-de"
},
"engines": {
"type": "string",
"description": "comma list of 2-3 engines: yahoo, yandex (web mode). news mode has a single live engine (bing), so multi-engine is web-only"
},
"timelimit": {
"enum": [
"d",
"w",
"m",
"y"
],
"type": "string",
"description": "restrict to past day/week/month/year"
},
"safesearch": {
"enum": [
"on",
"moderate",
"off"
],
"type": "string",
"default": "moderate"
},
"num_results": {
"type": "string",
"default": "10",
"description": "max results per engine, cap 25"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA",
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.kadec0.xyz/v1/geocode",
"tags": [
"geocode",
"geocoding",
"lat-lng",
"address",
"coordinates"
],
"mimeType": "application/json",
"description": "Geocoding and reverse geocoding. Converts an address or place name to latitude/longitude, or coordinates back to an address.",
"serviceName": "Geocoding & Reverse Geocode"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"q": "1600 Amphitheatre Parkway, Mountain View, CA"
}
},
"output": {
"type": "json",
"example": {
"count": 1,
"items": [
{
"lat": 37.422,
"lon": -122.0841,
"type": "geocode",
"address": {
"city": "Mountain View",
"country": "United States"
},
"displayName": "Googleplex, Mountain View, CA, USA"
}
]
}
}
},
"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",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"anyOf": [
{
"required": [
"q"
]
},
{
"required": [
"lat",
"lon"
]
}
],
"required": [],
"properties": {
"q": {
"type": "string",
"description": "address (forward geocode)"
},
"lat": {
"type": "string",
"description": "latitude (reverse geocode)"
},
"lon": {
"type": "string",
"description": "longitude (reverse geocode)"
},
"maxItems": {
"type": "string",
"default": "5"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}
] OVER TIME
All charts use the 30d selector; each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/hacker-news-stories-search/price, /scores, /volume and /buyers. On-chain volume and distinct buyers are measured over the service's settlement address and are a conservative undercount (only settlements that reach a measured facilitator are counted). The on-chain series roll up hourly, so the latest day can be up to about an hour behind; distinct buyers are counted per payout address, so a service that settles to more than one address is an upper bound.
Median across 43 endpoints. Use the selector to isolate one.
checklist grew 11->14 on 2026-07-28; a step here is a metric change, not a regression
Measured site and economics pillars from the assessment history, so the latest value shown elsewhere on this page reads as a point on a trend rather than a permanent state.
COMPLIANCE
14/14 checks pass · grade Alast 402 captured 2026-09-08 · last up 2026-09-23
- 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
SITE PILLARS
- homepage reachable
- openapi doc
- pricing page
- llms.txt
- robots.txt
- terms page
recent checks (18) live · click to expand
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