payment-ready until 2026-09-01
OpenAI-compatible paid inference via x402. POST /v1/chat/completions. $0.01 USDC on Base and Solana. Returns a signed public receipt.
Pay from $0.01 per request in USDC on Base / Solana, settled onchain via the x402 protocol, no signup, no API key needed.
listed 2026-08-25 · no on-chain settlement recorded yet
VERDICT
ranking generation 3Not yet ranked: too little of this service has been measured to place it against the rest of AI. We show no score rather than one assembled out of defaults.
ALTERNATIVES IN AI
Other AI 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 |
|---|---|---|---|---|
| x402engine | solid | 93 | 100% | $23.34 |
| Agent402.tools | solid | 92 | 98.2% | $70.37 |
| vaaya | solid | 91 | 100% | $27.55 |
| Otto AI | solid | 91 | 100% | $60.72 |
| StableEmail | solid | 90 | 100% | $26.16 |
ASSESSMENT
updated 30m 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 -
- uptime 24h
- -
- uptime 7d
- -
- uptime 30d
- -
- uptime 90d
- -
- response p95
- -
- avg response
- -
- total checks
- 0
Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.
compliance unknown
x402 compliance not evaluated yet.
price $0.01 (p44 in AI)
- price (min)
- $0.01
- category percentile (min)
- p44 in AI
- endpoints / prices
- 1 / 1
- model
- flat
- stability
- 100%
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
- 258d
- registrar
- Namecheap Inc.
- hosting
- custom
- domain created
- 2025-12-09
Identity facts, not a risk score.
traction $0.00 30d · 0 buyers
- volume 30d
- $0.00
- buyers 30d
- 0
- settlements 30d
- 0
- measured since
- --- (start of our harvest window)
- last settlement
- ---
- top buyer share
- -
- trend 7d vs 30d
- -
- networks
- eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpKuc147dw2N9d
- volume all-time
- $0
- settlements all-time
- 0
- median settlement 30d
- -
- max settlement 30d
- -
- settled via
- -
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.
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/chat/completions | $0.01 | Base/Solana | USDC | header |
REQUEST / RESPONSE EXAMPLE
An unpaid request to GET /v1/chat/completions returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.
curl -i 'https://api.xfuel.app/v1/chat/completions'
// 402 response (captured by monitor) · 1 payload · click to expand
[
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"nonce": "0x2d122724c438ad8c1baf43a061e03b41bcb655a1c2144618aa69a7a6bbdd6a4f",
"taskId": "openai-d598fdf7-ba2d-4a6b-8e4a-630c498b609d",
"version": "2",
"expiresAt": 1787643360821
},
"payTo": "0x23f713411c30BBd9A989c9cbC22EB0b55F7f7334",
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"maxAmountRequired": "10000",
"maxTimeoutSeconds": 120
},
{
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"nonce": "0x6fdc1b72c7cdbf50fc9414dc4014ee0a63b602a157b317e41775aea11c01b794",
"taskId": "openai-d598fdf7-ba2d-4a6b-8e4a-630c498b609d",
"feePayer": "CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww",
"expiresAt": 1787643360821
},
"payTo": "58Qo8QTJ1Sd4aXSygwAeBLNL3VrXRmfUCceB6b5RJCx6",
"amount": "10000",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"maxAmountRequired": "10000",
"maxTimeoutSeconds": 120
}
],
"resource": {
"url": "https://api.xfuel.app/v1/chat/completions",
"tags": [
"llm",
"openai-compatible",
"chat-completions",
"inference"
],
"iconUrl": "https://api.xfuel.app/xfuel-icon.svg",
"mimeType": "application/json",
"description": "OpenAI-compatible paid inference via x402 USDC on Base and Solana ($0.01). POST /v1/chat/completions is the recommended surface. Returns signed receipt + public verify_url. Paying this host is real mainnet USDC.",
"serviceName": "XFuel"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"model": "xfuel/auto",
"messages": [
{
"role": "user",
"content": "Hello"
}
],
"max_tokens": 500
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"id": "chatcmpl-abc123",
"model": "xfuel/auto",
"usage": {
"total_tokens": 15,
"prompt_tokens": 10,
"completion_tokens": 5
},
"xfuel": {
"verify_url": "https://api.xfuel.app/receipt/openai-abc123"
},
"object": "chat.completion",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "Hello!"
},
"finish_reason": "stop"
}
],
"created": 1700000000
}
}
},
"schema": {
"type": "object",
"$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": [
"messages"
],
"properties": {
"model": {
"type": "string",
"description": "Model id from GET /v1/models; xfuel/auto routes automatically"
},
"stream": {
"type": "boolean"
},
"messages": {
"type": "array",
"items": {
"type": "object",
"required": [
"role",
"content"
],
"properties": {
"role": {
"enum": [
"system",
"user",
"assistant"
],
"type": "string"
},
"content": {
"type": "string"
}
}
},
"description": "OpenAI-style chat messages array"
},
"max_tokens": {
"type": "integer",
"description": "Output token budget"
},
"temperature": {
"type": "number",
"maximum": 2,
"minimum": 0
}
}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"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/xfuel/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.
checklist grew 11->14 on 2026-07-28; a step here is a metric change, not a regression
COMPLIANCE
not evaluatedlast 402 captured 2026-08-25 · last up 2026-08-25
- 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 (2) live · click to expand
EMBED THIS BADGE
<a href="https://x402-list.com/services/xfuel?utm_source=badge&utm_medium=referral&utm_campaign=embed"> <img src="https://x402-list.com/badge/xfuel.svg" alt="XFuel listed on x402-list" height="28"> </a>
[](https://x402-list.com/services/xfuel?utm_source=badge&utm_medium=referral&utm_campaign=embed)
<a href="https://x402-list.com/services/xfuel?utm_source=badge&utm_medium=referral&utm_campaign=embed"> <img src="https://x402-list.com/badge/xfuel.svg?data=uptime" alt="XFuel uptime on x402-list" height="28"> </a>