Taifoon coordination API
payment-ready until 2026-11-03
Pay-per-call AI and chain services for agents, x402 v2 exact in USDC on Base, Arbitrum, Monad, Arc, Robinhood Chain or Solana.
Compare: all LLM APIs
Call it x402 v2
x402 v2
- Base URL
- https://coord.taifoon.dev
- Payment
- x402 v2, header channel
$ curl -i 'https://coord.taifoon.dev/v1/x402/class/market.price' An unpaid request returns HTTP 402 with the payment terms. Sign a payment authorization, then retry with the PAYMENT-SIGNATURE header.
Endpoints 3 paid routes on coord.taifoon.dev
Prices as captured in the 402 response: median $0.00982 across the 3 endpoints, unchanged since first capture.
Example 402 response
Endpoints and prices
| Method | Path | Description | Price | Network | Asset | 402 channel | Captured |
|---|---|---|---|---|---|---|---|
| GET | / | Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape holds; a price older than 180 s is never served as current (nothing is charged). BTC, ETH, SOL are held to Chainlink on Base within 1 % when its feed is under 1 h old. 0.003 USDC a call. | $0.003 | Arbitrum One+ | USDC, USD Coin, Global Dollar | header | since 10-27 |
| GET | / | Olas-style yes/no forecast: { question } in, { p_yes, p_no, confidence, info_utility } out with reasoning and sources. BTC/ETH/SOL price questions with a threshold and a date are modelled from the Taifoon venue tape (sources replayable); any other question is a small open model's prior with no web search (no sources, confidence at most 0.3). Checked before you are charged. 0.01 USDC a forecast. | $0.01 | Arbitrum One+ | USDC, USD Coin, Global Dollar | header | since 10-27 |
| GET | / | risk.address, sold by Taifoon: 5 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.009820 USDC. | $0.00982 | Arbitrum One+ | USDC, USD Coin, Global Dollar | header | since 10-27 |
Payment evidence
402 payload captured at . Check evidence JSON · Measurement methodology.
First of 3 payloads captured by the monitor for GET /v1/x402/class/market.price.
291 lines, scroll inside
{
"error": "Payment Required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
"amount": "3000",
"scheme": "exact",
"network": "eip155:8453",
"mimeType": "application/json",
"resource": "https://coord.taifoon.dev/v1/x402/class/market.price",
"description": "Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape holds; a price older than 180 s is never served as current (nothing is charged). BTC, ETH, SOL are held to Chainlink on Base within 1 % when its feed is under 1 h old. 0.003 USDC a call.",
"maxAmountRequired": "3000",
"maxTimeoutSeconds": 300
},
{
"asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
"amount": "3000",
"scheme": "exact",
"network": "eip155:42161",
"mimeType": "application/json",
"resource": "https://coord.taifoon.dev/v1/x402/class/market.price",
"description": "Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape holds; a price older than 180 s is never served as current (nothing is charged). BTC, ETH, SOL are held to Chainlink on Base within 1 % when its feed is under 1 h old. 0.003 USDC a call.",
"maxAmountRequired": "3000",
"maxTimeoutSeconds": 300
},
{
"asset": "0x3600000000000000000000000000000000000000",
"extra": {
"name": "USDC",
"version": "2"
},
"payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
"amount": "3000",
"scheme": "exact",
"network": "eip155:5042",
"mimeType": "application/json",
"resource": "https://coord.taifoon.dev/v1/x402/class/market.price",
"description": "Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape holds; a price older than 180 s is never served as current (nothing is charged). BTC, ETH, SOL are held to Chainlink on Base within 1 % when its feed is under 1 h old. 0.003 USDC a call.",
"maxAmountRequired": "3000",
"maxTimeoutSeconds": 300
},
{
"asset": "0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168",
"extra": {
"name": "Global Dollar",
"version": "1"
},
"payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
"amount": "3000",
"scheme": "exact",
"network": "eip155:4663",
"mimeType": "application/json",
"resource": "https://coord.taifoon.dev/v1/x402/class/market.price",
"description": "Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape holds; a price older than 180 s is never served as current (nothing is charged). BTC, ETH, SOL are held to Chainlink on Base within 1 % when its feed is under 1 h old. 0.003 USDC a call.",
"maxAmountRequired": "3000",
"maxTimeoutSeconds": 300
},
{
"asset": "0x754704Bc059F8C67012fEd69BC8A327a5aafb603",
"extra": {
"name": "USDC",
"version": "2"
},
"payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
"amount": "3000",
"scheme": "exact",
"network": "eip155:143",
"mimeType": "application/json",
"resource": "https://coord.taifoon.dev/v1/x402/class/market.price",
"description": "Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape holds; a price older than 180 s is never served as current (nothing is charged). BTC, ETH, SOL are held to Chainlink on Base within 1 % when its feed is under 1 h old. 0.003 USDC a call.",
"maxAmountRequired": "3000",
"maxTimeoutSeconds": 300
},
{
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "F742C4VfFLQ9zRQyithoj5229ZgtX2WqKCSFKgH2EThq"
},
"payTo": "GQcEn5pLcweo7qaiy3rDdsiUPiygygmFBaixNtNqhQVD",
"amount": "3000",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"mimeType": "application/json",
"resource": "https://coord.taifoon.dev/v1/x402/class/market.price",
"description": "Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape holds; a price older than 180 s is never served as current (nothing is charged). BTC, ETH, SOL are held to Chainlink on Base within 1 % when its feed is under 1 h old. 0.003 USDC a call.",
"maxAmountRequired": "3000",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://coord.taifoon.dev/v1/x402/class/market.price",
"tags": [
"market",
"price"
],
"iconUrl": "https://www.taifoon.io/apple-touch-icon.png",
"mimeType": "application/json",
"description": "Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape holds; a price older than 180 s is never served as current (nothing is charged). BTC, ETH, SOL are held to Chainlink on Base within 1 % when its feed is under 1 h old. 0.003 USDC a call.",
"serviceName": "Taifoon"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"symbol": "ETH"
}
},
"output": {
"type": "json",
"example": {
"ok": true,
"bar": {
"c": 2538.81,
"h": 2539.1,
"l": 2538.6,
"o": 2538.88,
"t": 1791742740,
"v": 12.4,
"tf": "1m"
},
"age_s": 41,
"as_of": "2026-10-11T18:20:00.000Z",
"class": "market.price",
"fresh": true,
"digest": "9f2c…",
"replay": "https://clob.taifoon.dev/tape/v1/candles/ETH/1m?from=1791742740&to=1791742799",
"source": "the Taifoon venue tape (https://clob.taifoon.dev/tape/v1/candles/ETH/1m): the close of the last closed 1-minute bar",
"symbol": "ETH",
"price_usd": 2538.81,
"reference": {
"usd": 2539.4,
"age_s": 600,
"source": "Chainlink ETH / USD on Base",
"off_pct": 0.02
}
}
}
},
"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"
},
"headers": {
"type": "object",
"additionalProperties": {
"type": "string"
}
},
"queryParams": {
"type": "object",
"required": [
"symbol"
],
"properties": {
"symbol": {
"enum": [
"BTC",
"ETH",
"SOL",
"NQ",
"ES",
"YM"
],
"type": "string",
"description": "the symbol to price: one the Taifoon venue tape holds"
}
},
"additionalProperties": {
"type": "string"
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"required": [
"symbol",
"price_usd",
"as_of",
"age_s",
"digest"
],
"properties": {
"age_s": {
"type": "integer",
"description": "seconds since the bar closed; at most 180, else no price is served"
},
"as_of": {
"type": "string",
"description": "when the bar closed (ISO 8601)"
},
"digest": {
"type": "string",
"description": "sha256 over the bar’s \"t,o,h,l,c,v\" line (the market.candles digest)"
},
"replay": {
"type": "string",
"description": "the tape GET that returns the same bar"
},
"symbol": {
"enum": [
"BTC",
"ETH",
"SOL",
"NQ",
"ES",
"YM"
],
"type": "string"
},
"price_usd": {
"type": "number"
}
}
}
}
}
}
}
}
},
"x402Version": 2,
"without_x402": {
"why": "x402 is settled on eip155:8453 (Base), eip155:42161 (Arbitrum One), eip155:5042 (Arc), eip155:4663 (Robinhood Chain), eip155:143 (Monad), solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp (Solana): pay the entry of the network you hold the dollar token on. A key with a balance is the other way to pay, the same price on any of them.",
"direct": {
"then": "send the same request with X-API-Key: it is paid from the balance at the same price",
"quote": "GET https://www.taifoon.io/v1/access/quote?usdc=1&chainId=<id> with X-API-Key (POST /v1/register for one), then POST /v1/access/topup { tx, signature, chainId }",
"chains": [
"eip155:8453 (Base, USDC)",
"eip155:42161 (Arbitrum One, USDC)",
"eip155:5042 (Arc, USDC)",
"eip155:4663 (Robinhood Chain, USDG)",
"eip155:143 (Monad, USDC)"
],
"for_a_person": "https://www.taifoon.io/pricing"
},
"settles_x402": [
"eip155:8453",
"eip155:42161",
"eip155:5042",
"eip155:4663",
"eip155:143",
"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
]
}
} Other captured 402 responses (2)
Captured payload 2 of 3
{
"error": "Payment Required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
"amount": "9820",
"scheme": "exact",
"network": "eip155:8453",
"mimeType": "application/json",
"resource": "https://www.taifoon.io/api/coordination/x402/class/risk.address",
"description": "risk.address, sold by Taifoon: 5 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.009820 USDC.",
"maxAmountRequired": "9820",
"maxTimeoutSeconds": 300
},
{
"asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
"amount": "9820",
"scheme": "exact",
"network": "eip155:42161",
"mimeType": "application/json",
"resource": "https://www.taifoon.io/api/coordination/x402/class/risk.address",
"description": "risk.address, sold by Taifoon: 5 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.009820 USDC.",
"maxAmountRequired": "9820",
"maxTimeoutSeconds": 300
},
{
"asset": "0x3600000000000000000000000000000000000000",
"extra": {
"name": "USDC",
"version": "2"
},
"payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
"amount": "9820",
"scheme": "exact",
"network": "eip155:5042",
"mimeType": "application/json",
"resource": "https://www.taifoon.io/api/coordination/x402/class/risk.address",
"description": "risk.address, sold by Taifoon: 5 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.009820 USDC.",
"maxAmountRequired": "9820",
"maxTimeoutSeconds": 300
},
{
"asset": "0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168",
"extra": {
"name": "Global Dollar",
"version": "1"
},
"payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
"amount": "9820",
"scheme": "exact",
"network": "eip155:4663",
"mimeType": "application/json",
"resource": "https://www.taifoon.io/api/coordination/x402/class/risk.address",
"description": "risk.address, sold by Taifoon: 5 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.009820 USDC.",
"maxAmountRequired": "9820",
"maxTimeoutSeconds": 300
},
{
"asset": "0x754704Bc059F8C67012fEd69BC8A327a5aafb603",
"extra": {
"name": "USDC",
"version": "2"
},
"payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
"amount": "9820",
"scheme": "exact",
"network": "eip155:143",
"mimeType": "application/json",
"resource": "https://www.taifoon.io/api/coordination/x402/class/risk.address",
"description": "risk.address, sold by Taifoon: 5 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.009820 USDC.",
"maxAmountRequired": "9820",
"maxTimeoutSeconds": 300
},
{
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "F742C4VfFLQ9zRQyithoj5229ZgtX2WqKCSFKgH2EThq"
},
"payTo": "GQcEn5pLcweo7qaiy3rDdsiUPiygygmFBaixNtNqhQVD",
"amount": "9820",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"mimeType": "application/json",
"resource": "https://www.taifoon.io/api/coordination/x402/class/risk.address",
"description": "risk.address, sold by Taifoon: 5 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.009820 USDC.",
"maxAmountRequired": "9820",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://www.taifoon.io/api/coordination/x402/class/risk.address",
"tags": [
"risk",
"address"
],
"iconUrl": "https://www.taifoon.io/apple-touch-icon.png",
"mimeType": "application/json",
"description": "risk.address, sold by Taifoon: 5 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.009820 USDC.",
"serviceName": "Taifoon"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"input": {
"address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"chainId": 8453
}
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"ok": true,
"sale": {
"id": "rs_…",
"payment_tx": "0x…"
},
"class": "risk.address",
"answer": "…the seller’s answer…",
"checks": {
"content": true
}
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"address",
"chainId"
],
"properties": {
"address": {
"type": "string",
"description": "the 0x address"
},
"chainId": {
"type": "integer",
"description": "the chain the address is read on"
}
}
}
}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"headers": {
"type": "object",
"additionalProperties": {
"type": "string"
}
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"queryParams": {
"type": "object",
"additionalProperties": {
"type": "string"
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2,
"without_x402": {
"why": "x402 is settled on eip155:8453 (Base), eip155:42161 (Arbitrum One), eip155:5042 (Arc), eip155:4663 (Robinhood Chain), eip155:143 (Monad), solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp (Solana): pay the entry of the network you hold the dollar token on. A key with a balance is the other way to pay, the same price on any of them.",
"direct": {
"then": "send the same request with X-API-Key: it is paid from the balance at the same price",
"quote": "GET https://www.taifoon.io/v1/access/quote?usdc=1&chainId=<id> with X-API-Key (POST /v1/register for one), then POST /v1/access/topup { tx, signature, chainId }",
"chains": [
"eip155:8453 (Base, USDC)",
"eip155:42161 (Arbitrum One, USDC)",
"eip155:5042 (Arc, USDC)",
"eip155:4663 (Robinhood Chain, USDG)",
"eip155:143 (Monad, USDC)"
],
"for_a_person": "https://www.taifoon.io/pricing"
},
"settles_x402": [
"eip155:8453",
"eip155:42161",
"eip155:5042",
"eip155:4663",
"eip155:143",
"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
]
}
}Captured payload 3 of 3
{
"error": "Payment Required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"mimeType": "application/json",
"resource": "https://coord.taifoon.dev/v1/x402/class/mech.predict",
"description": "Olas-style yes/no forecast: { question } in, { p_yes, p_no, confidence, info_utility } out with reasoning and sources. BTC/ETH/SOL price questions with a threshold and a date are modelled from the Taifoon venue tape (sources replayable); any other question is a small open model's prior with no web search (no sources, confidence at most 0.3). Checked before you are charged. 0.01 USDC a forecast.",
"maxAmountRequired": "10000",
"maxTimeoutSeconds": 300
},
{
"asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
"amount": "10000",
"scheme": "exact",
"network": "eip155:42161",
"mimeType": "application/json",
"resource": "https://coord.taifoon.dev/v1/x402/class/mech.predict",
"description": "Olas-style yes/no forecast: { question } in, { p_yes, p_no, confidence, info_utility } out with reasoning and sources. BTC/ETH/SOL price questions with a threshold and a date are modelled from the Taifoon venue tape (sources replayable); any other question is a small open model's prior with no web search (no sources, confidence at most 0.3). Checked before you are charged. 0.01 USDC a forecast.",
"maxAmountRequired": "10000",
"maxTimeoutSeconds": 300
},
{
"asset": "0x3600000000000000000000000000000000000000",
"extra": {
"name": "USDC",
"version": "2"
},
"payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
"amount": "10000",
"scheme": "exact",
"network": "eip155:5042",
"mimeType": "application/json",
"resource": "https://coord.taifoon.dev/v1/x402/class/mech.predict",
"description": "Olas-style yes/no forecast: { question } in, { p_yes, p_no, confidence, info_utility } out with reasoning and sources. BTC/ETH/SOL price questions with a threshold and a date are modelled from the Taifoon venue tape (sources replayable); any other question is a small open model's prior with no web search (no sources, confidence at most 0.3). Checked before you are charged. 0.01 USDC a forecast.",
"maxAmountRequired": "10000",
"maxTimeoutSeconds": 300
},
{
"asset": "0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168",
"extra": {
"name": "Global Dollar",
"version": "1"
},
"payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
"amount": "10000",
"scheme": "exact",
"network": "eip155:4663",
"mimeType": "application/json",
"resource": "https://coord.taifoon.dev/v1/x402/class/mech.predict",
"description": "Olas-style yes/no forecast: { question } in, { p_yes, p_no, confidence, info_utility } out with reasoning and sources. BTC/ETH/SOL price questions with a threshold and a date are modelled from the Taifoon venue tape (sources replayable); any other question is a small open model's prior with no web search (no sources, confidence at most 0.3). Checked before you are charged. 0.01 USDC a forecast.",
"maxAmountRequired": "10000",
"maxTimeoutSeconds": 300
},
{
"asset": "0x754704Bc059F8C67012fEd69BC8A327a5aafb603",
"extra": {
"name": "USDC",
"version": "2"
},
"payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
"amount": "10000",
"scheme": "exact",
"network": "eip155:143",
"mimeType": "application/json",
"resource": "https://coord.taifoon.dev/v1/x402/class/mech.predict",
"description": "Olas-style yes/no forecast: { question } in, { p_yes, p_no, confidence, info_utility } out with reasoning and sources. BTC/ETH/SOL price questions with a threshold and a date are modelled from the Taifoon venue tape (sources replayable); any other question is a small open model's prior with no web search (no sources, confidence at most 0.3). Checked before you are charged. 0.01 USDC a forecast.",
"maxAmountRequired": "10000",
"maxTimeoutSeconds": 300
},
{
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "F742C4VfFLQ9zRQyithoj5229ZgtX2WqKCSFKgH2EThq"
},
"payTo": "GQcEn5pLcweo7qaiy3rDdsiUPiygygmFBaixNtNqhQVD",
"amount": "10000",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"mimeType": "application/json",
"resource": "https://coord.taifoon.dev/v1/x402/class/mech.predict",
"description": "Olas-style yes/no forecast: { question } in, { p_yes, p_no, confidence, info_utility } out with reasoning and sources. BTC/ETH/SOL price questions with a threshold and a date are modelled from the Taifoon venue tape (sources replayable); any other question is a small open model's prior with no web search (no sources, confidence at most 0.3). Checked before you are charged. 0.01 USDC a forecast.",
"maxAmountRequired": "10000",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://coord.taifoon.dev/v1/x402/class/mech.predict",
"tags": [
"mech",
"predict"
],
"iconUrl": "https://www.taifoon.io/apple-touch-icon.png",
"mimeType": "application/json",
"description": "Olas-style yes/no forecast: { question } in, { p_yes, p_no, confidence, info_utility } out with reasoning and sources. BTC/ETH/SOL price questions with a threshold and a date are modelled from the Taifoon venue tape (sources replayable); any other question is a small open model's prior with no web search (no sources, confidence at most 0.3). Checked before you are charged. 0.01 USDC a forecast.",
"serviceName": "Taifoon"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"question": "Will Bitcoin be above $100,000 on December 31, 2026?"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"tool": "prediction-tape",
"prompt": "Will Bitcoin be above $100,000 on December 31, 2026?",
"result": "{\"p_yes\":0.31,\"p_no\":0.69,\"confidence\":0.6,\"info_utility\":0.7}",
"forecast": {
"p_no": 0.69,
"p_yes": 0.31,
"sources": [
{
"url": "https://clob.taifoon.dev/tape/v1/candles/BTC/1m?from=…&to=…",
"kind": "tape",
"what": "the last closed 1-minute BTC bar (its close is the spot)",
"as_of": "…",
"value": 0
}
],
"grounded": "tape",
"reasoning": "BTC closed at … USD on the Taifoon venue tape …; a driftless lognormal price ends at or above 100,000 with probability 0.31. …",
"confidence": 0.6,
"info_utility": 0.7
},
"follow_up": {
"id": "fc_…",
"state": "PENDING",
"resolver": "tape"
},
"requestId": "fc_…"
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"question"
],
"properties": {
"question": {
"type": "string",
"maxLength": 2000,
"minLength": 8,
"description": "one yes/no question (or the Olas prompt \"With the given question \\\"…\\\" …\")"
}
}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"headers": {
"type": "object",
"additionalProperties": {
"type": "string"
}
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"queryParams": {
"type": "object",
"additionalProperties": {
"type": "string"
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"required": [
"requestId",
"result",
"prompt",
"tool"
],
"properties": {
"tool": {
"enum": [
"prediction-tape",
"prediction-offline"
],
"type": "string"
},
"prompt": {
"type": "string"
},
"result": {
"type": "string",
"description": "JSON string { p_yes, p_no, confidence, info_utility }, each in [0, 1], p_yes + p_no = 1 (the Olas prediction tools’ result)"
},
"forecast": {
"type": "object",
"description": "p_yes, p_no, confidence, info_utility, reasoning, grounded (tape | none), sources (each a GET that replays it), limits"
},
"follow_up": {
"type": "object",
"description": "the row kept for scoring once the question resolves: id, resolver (tape | null), state (PENDING | MISSING)"
},
"requestId": {
"type": "string"
}
}
}
}
}
}
}
}
},
"x402Version": 2,
"without_x402": {
"why": "x402 is settled on eip155:8453 (Base), eip155:42161 (Arbitrum One), eip155:5042 (Arc), eip155:4663 (Robinhood Chain), eip155:143 (Monad), solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp (Solana): pay the entry of the network you hold the dollar token on. A key with a balance is the other way to pay, the same price on any of them.",
"direct": {
"then": "send the same request with X-API-Key: it is paid from the balance at the same price",
"quote": "GET https://www.taifoon.io/v1/access/quote?usdc=1&chainId=<id> with X-API-Key (POST /v1/register for one), then POST /v1/access/topup { tx, signature, chainId }",
"chains": [
"eip155:8453 (Base, USDC)",
"eip155:42161 (Arbitrum One, USDC)",
"eip155:5042 (Arc, USDC)",
"eip155:4663 (Robinhood Chain, USDG)",
"eip155:143 (Monad, USDC)"
],
"for_a_person": "https://www.taifoon.io/pricing"
},
"settles_x402": [
"eip155:8453",
"eip155:42161",
"eip155:5042",
"eip155:4663",
"eip155:143",
"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
]
}
}Can I trust it score from our own monitoring
score from our own monitoring
#139 of 210 in AI. Bands: strong 93+, solid 75+, mixed 55+, weak below 55.
- Reliability
- 100% uptime since 10-27
- Compliance
- A 14/14 checks pass
- Price
- $0.003 to $0.01 p28 in AI
- Risk
- clean no risk flag
- Traction
- $1.87 30d 17 buyers, top buyer 61% (address, not entity)
- Last change
- price changed 1h ago 1 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 2026-10-27. Last up 2026-10-27.
── 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, 2184ms response p95, x402 compliance 14 of 14, $0.003 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 AI, 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 210 listings, this one among them: the same 210 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.
Settled via coinbase ($1.87, 219 tx). Traction is a conservative undercount; first settlement seen 2026-10-03.
All measured facts
What it does
Pay-per-call AI and chain services for agents, x402 v2 exact in USDC on Base, Arbitrum, Monad, Arc, Robinhood Chain or Solana. OpenAI-compatible chat completions (POST /v1/chat/completions, or /v1/chat/completions/<model>): Llama 3.3 70B, gpt-oss-120b, DeepSeek V3.2 / V4 Flash, Qwen3 235B, GLM 4.7 and TEE-attested GLM 5.3 Flash, Qwen3-VL and Qwen3.8 from 0.001 USDC per call. Graded answers by System One / Jev (0.05 USDC per grade). Class walls: market.price (0.003), risk.address and mech.predict (0.01). Proved transaction reads under the V5 superroot (GET /v1/proof/tx/<chain>/<tx>, 0.002). No account needed; a free key raises limits. Seller of record: Taifoon.
Taifoon coordination API is a listed x402 AI API. Captured payment terms name Arbitrum One, Base, Solana. 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: 2026-09-28 to 2026-10-27 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 · AI
- uptime · latest daily rollup
- 100%
- uptime 7d
- 100%
- uptime 30d
- 100%
- uptime 90d
- 100%
- response p95
- 2184ms
- avg response
- 1741ms
- total checks
- 5
Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.
- price (min)
- $0.003
- price (max)
- $0.01
- category percentile (min)
- p28 in AI
- category percentile (max)
- p25 in AI
- endpoints / prices
- 3 / 3
- model
- tiered
- 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
- -
- registrar
- -
- hosting
- custom
- domain created
- ---
Identity facts, not a risk score.
- assessment volume 30d
- $1.87
- exact assessment volume 30d (USD)
- 1.869942
- assessment recorded at (UTC)
- 2026-10-27T12:43:00.955Z
- buyers 30d
- 17
- settlements 30d
- 219
- measured since
- 2026-10-03 (start of our harvest window)
- last settlement
- 2026-10-27
- top buyer share
- 61% of 30d volume (address, not entity)
- top 3 buyers share
- 75% of 30d volume (addresses, not entities)
- concentrated volume
- no
- trend 7d vs 30d
- 0.60x the 30d daily rate
- networks
- eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpKuc147dw2N9d
- volume all-time
- $1.89
- settlements all-time
- 219
- median settlement 30d
- $0.001
- max settlement 30d
- $0.50
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
- 2026-10-27
Recent checks
| Checked at (UTC) | Status | HTTP | Response | Endpoints |
|---|---|---|---|---|
| Online | 402 | 1710ms | 3 | |
| Online | 402 | 2534ms | 3 | |
| Online | 402 | 1984ms | 3 | |
| Online | 402 | 1279ms | 3 | |
| Online | 402 | 1442ms | 3 | |
| Online | 402 | 2184ms | 3 | |
| Online | 402 | 1604ms | 3 | |
| Online | 402 | 2096ms | 3 | |
| Online | 402 | 1377ms | 3 |
Changes1 in 30d
| Observed at (UTC) | Change | Evidence |
|---|---|---|
| price changed |
|
Amounts are on-wire atomic units in the named asset.
Over time
- Volume 30d
- $1.87
- Uptime
- no completed-day data
More charts
09-28 to 10-27* UTC
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: $1.89, peak $0.63 on 10-08. 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: 2026-09-28 to 2026-10-27 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 |
|---|---|---|---|---|---|---|---|---|
| 2026-10-03 | $0.05 | 1 | 1 | no data | no data | no data | no data | no data |
| 2026-10-04 | $0.34 | 1 | 6 | no data | no data | no data | no data | no data |
| 2026-10-05 | $0.07 | 1 | 2 | no data | no data | no data | no data | no data |
| 2026-10-06 | $0.26 | 3 | 4 | no data | no data | no data | no data | no data |
| 2026-10-07 | $0.03 | 2 | 2 | no data | no data | no data | no data | no data |
| 2026-10-08 | $0.63 | 2 | 4 | no data | no data | no data | no data | no data |
| 2026-10-09 | no data | no data | no data | no data | no data | no data | no data | no data |
| 2026-10-10 | no data | no data | no data | no data | no data | no data | no data | no data |
| 2026-10-11 | no data | no data | no data | no data | no data | no data | no data | no data |
| 2026-10-12 | $0.13 | 2 | 11 | no data | no data | no data | no data | no data |
| 2026-10-13 | $0.00 recorded† | 1 | 1 | no data | no data | no data | no data | no data |
| 2026-10-14 | $0.01 | 3 | 4 | no data | no data | no data | no data | no data |
| 2026-10-15 | $0.03 | 2 | 3 | no data | no data | no data | no data | no data |
| 2026-10-16 | $0.03 | 2 | 3 | no data | no data | no data | no data | no data |
| 2026-10-17 | $0.01 | 1 | 1 | no data | no data | no data | no data | no data |
| 2026-10-18 | $0.02 | 1 | 2 | no data | no data | no data | no data | no data |
| 2026-10-19 | $0.02 | 1 | 2 | no data | no data | no data | no data | no data |
| 2026-10-20 | $0.01 | 1 | 1 | no data | no data | no data | no data | no data |
| 2026-10-21 | $0.01 | 4 | 6 | no data | no data | no data | no data | no data |
| 2026-10-22 | $0.03 | 3 | 10 | no data | no data | no data | no data | no data |
| 2026-10-23 | $0.00 recorded† | 1 | 1 | no data | no data | no data | no data | no data |
| 2026-10-24 | no data | no data | no data | no data | no data | no data | no data | no data |
| 2026-10-25 | $0.18 | 6 | 139 | no data | no data | no data | no data | no data |
| 2026-10-26 | $0.03 | 2 | 15 | no data | no data | no data | no data | no data |
| 2026-10-27* | $0.00 recorded† | 1 | 1 | 100% | 1663.67ms | 14/14 | p28 | 3/6 |
Alternatives in AI
5 of 209 other ranked services in AI, ordered by the same measured score.
Own this service?
Keep this listing accurate. Ownership is proven with a domain check and every change is reviewed by hand.
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.
Verify this service ($0.25)Embed a badge
HTML
<a href="https://x402-list.com/services/ taifoon-coordination-api? utm_source=badge& utm_medium=referral& utm_campaign=embed"> <img src="https://x402-list.com/ badge/ taifoon-coordination-api.svg" alt="Taifoon coordination API listed on x402-list" height="28"> </a>
Markdown
[](https://x402-list.com/ services/ taifoon-coordination-api? utm_source=badge& utm_medium=referral& utm_campaign=embed)
HTML, live uptime variant
<a href="https://x402-list.com/services/ taifoon-coordination-api? utm_source=badge& utm_medium=referral& utm_campaign=embed"> <img src="https://x402-list.com/ badge/ taifoon-coordination-api.svg? data=uptime" alt="Taifoon coordination API uptime on x402-list" height="28"> </a>
Delisting
To request delisting, email info@x402-list.com with the service name, slug, or URL. Removal is free and does not require proof of ownership. Contact.