XFuel
Swap one baseURL. Every call comes back with a public receipt that names the model, the hub, and the cost. /v1 is unmetered. USDC on Base is a separate paid door.
InferenceLiveeip155:8453Exactvia cdp
LlmOpenai-compatibleChat-completionsInference
Calls · 30d
1↓ 54%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 30 snapshots so far.
$0.99
Verified settled volume
148 settlements proven x402 by their on-chain EIP-3009 marker.
$0.010
Listed price
As published in the catalog. Always read the live 402 before paying.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-08-24 13:41Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x23f713411c30BBd9A989c9cbC22EB0b55F7f7334The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"nonce": "0x35b3ea98d403d33a2ada3b95da14ccd17466e2d418351260096caee8e5b7ac05",
"taskId": "x402-discovery-ce3cb1b7-d71d-4bb8-84f1-0cc2e6a418fc",
"version": "2",
"expiresAt": 1790198243061
},
"payTo": "0x23f713411c30BBd9A989c9cbC22EB0b55F7f7334",
"amount": "2000",
"scheme": "exact",
"network": "eip155:8453",
"maxAmountRequired": "2000",
"maxTimeoutSeconds": 120
},
{
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"nonce": "0x415f796feceff8df92c1d4f6b0f64c308d079ead6f7fa1447c2ef64cec3cdf6e",
"taskId": "x402-discovery-ce3cb1b7-d71d-4bb8-84f1-0cc2e6a418fc",
"feePayer": "CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww",
"expiresAt": 1790198243061
},
"payTo": "58Qo8QTJ1Sd4aXSygwAeBLNL3VrXRmfUCceB6b5RJCx6",
"amount": "2000",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"maxAmountRequired": "2000",
"maxTimeoutSeconds": 120
}
],
"resource": {
"url": "https://api.xfuel.app/task-request",
"tags": [
"treasury",
"possession-book",
"spend-receipt",
"x402",
"usdc"
],
"iconUrl": "https://api.xfuel.app/chit402-icon.svg",
"mimeType": "application/json",
"description": "Treasury desk and possession book for agent spend. Who paid which call — export, policy, evidence. POST /v1/chat/completions is the x402 USDC door on Base and Solana. Returns signed receipt + public verify_url. Paying this host is real mainnet USDC.",
"serviceName": "Chit402"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"sender": "YourSolanaWalletPubkey",
"payment": {
"rail": "usdc"
},
"chain_id": "base",
"messages": [
{
"role": "user",
"content": "Hello"
}
],
"model_id": "xfuel/auto",
"max_tokens": 500,
"message_type": "inference_request"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"status": "accepted",
"task_id": "ai-task-12345",
"fee_amount": "250",
"net_amount": "49750",
"verify_url": "https://api.xfuel.app/receipt/ai-task-12345",
"payment_ref": "base:0x...",
"gross_amount": "50000",
"payment_rail": "usdc"
}
}
},
"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": [
"message_type",
"chain_id",
"sender"
],
"properties": {
"amount": {
"type": "string",
"description": "Gross task value in USDC base units (6 decimals)"
},
"sender": {
"type": "string",
"description": "0x address that owns/pays for the task"
},
"payment": {
"type": "object",
"properties": {
"rail": {
"enum": [
"usdc"
],
"type": "string",
"description": "Payment rail; use \"usdc\""
}
}
},
"chain_id": {
"type": "string",
"description": "Settlement chain; \"base\" for USDC settlement"
},
"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"
},
"model_id": {
"type": "string",
"description": "Model id from GET /v1/models; xfuel/auto routes automatically"
},
"input_hash": {
"type": "string",
"description": "keccak256 of your input (optional; for proof binding)"
},
"max_tokens": {
"type": "integer",
"description": "Output token budget (default 500)"
},
"message_type": {
"enum": [
"inference_request"
],
"type": "string",
"description": "Task type; only inference_request is supported via x402"
}
}
},
"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
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.01USDC≈ $0.01 USD
on Base · exact scheme
Pay 0.01 USDC on Base to 0x23f7…f7334. The signed payment is good for 2 minutes.
- Paid to
- 0x23f7…f7334
- USD Coin contract
- 0x8335…02913
- Payment window
- 2 minutes
- As published
- 10000 smallest units
10000units
on solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- 58Qo8Q…RJCx6
- Token contract
- EPjFWd…TDt1v
- Payment window
- 2 minutes
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"nonce": "0xf7fe120d0d4f3e7aa58deb42f4d6da86baf9aa5134e58256a02ee1361c9ea3f8",
"taskId": "x402-discovery-8b1317ab-8134-4d4a-aab5-d03ac1c768ae",
"version": "2",
"expiresAt": 1787579010529
},
"payTo": "0x23f713411c30BBd9A989c9cbC22EB0b55F7f7334",
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"maxAmountRequired": "10000",
"maxTimeoutSeconds": 120
},
{
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"nonce": "0x46365a5f16c5096c72b607af71efa63796549824ba84de6b57d8b9739b73216c",
"taskId": "x402-discovery-8b1317ab-8134-4d4a-aab5-d03ac1c768ae",
"feePayer": "CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww",
"expiresAt": 1787579010529
},
"payTo": "58Qo8QTJ1Sd4aXSygwAeBLNL3VrXRmfUCceB6b5RJCx6",
"amount": "10000",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"maxAmountRequired": "10000",
"maxTimeoutSeconds": 120
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"sender": "YourSolanaWalletPubkey",
"payment": {
"rail": "usdc"
},
"chain_id": "base",
"messages": [
{
"role": "user",
"content": "Hello"
}
],
"model_id": "xfuel/auto",
"max_tokens": 500,
"message_type": "inference_request"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"status": "accepted",
"task_id": "ai-task-12345",
"fee_amount": "250",
"net_amount": "49750",
"verify_url": "https://api.xfuel.app/receipt/ai-task-12345",
"payment_ref": "base:0x...",
"gross_amount": "50000",
"payment_rail": "usdc"
}
}
},
"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": [
"message_type",
"chain_id",
"sender"
],
"properties": {
"amount": {
"type": "string",
"description": "Gross task value in USDC base units (6 decimals); min 10000 ($0.01)"
},
"sender": {
"type": "string",
"description": "0x address that owns/pays for the task"
},
"payment": {
"type": "object",
"properties": {
"rail": {
"enum": [
"usdc"
],
"type": "string",
"description": "Payment rail; use \"usdc\""
}
}
},
"chain_id": {
"type": "string",
"description": "Settlement chain; \"base\" for USDC settlement"
},
"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"
},
"model_id": {
"type": "string",
"description": "Model id from GET /v1/models; xfuel/auto routes automatically"
},
"input_hash": {
"type": "string",
"description": "keccak256 of your input (optional; for proof binding)"
},
"max_tokens": {
"type": "integer",
"description": "Output token budget (default 500)"
},
"message_type": {
"enum": [
"inference_request"
],
"type": "string",
"description": "Task type; only inference_request is supported via x402"
}
}
},
"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"
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-08-24 13:41Z
- Last indexed by Roundhouse
- 2026-09-23 13:10Z
- Last enriched (probe, favicon, geo)
- 2026-09-23 21:15Z
- x402 version
- 2
- Max timeout
- 120s
- Liveness probe
- HTTP 402
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 30 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service XFuel and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=XFuel' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://api.xfuel.app/task-request, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402, or use an organization key from https://roundhouseai.io/dashboard/team. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.