x402 census · api.xfuel.app · 0746958bfdfe · JSON

POST /v1/chat/completions

live

Signed spend receipts for agent x402 payments — who paid which call, verifiable by a third party. Treasury desk and possession book for agent spend — 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.

Verdict: live. The unpaid GET reached a valid 402. The live amount equals the catalog price.

Facts from the catalogs

Field Value

URL https://api.xfuel.app/v1/chat/completions

Method POST

Price $0.002 USDC = 2000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Network eip155:8453 (base); also accepts solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp

payTo 0x23f713411c30BBd9A989c9cbC22EB0b55F7f7334

Seller api.xfuel.app

Catalogs cdp (row updated 2026-09-28), payai (row updated 2026-09-03)

Listed since (lower bound) 2026-09-03 (earliest catalog timestamp; catalogs report last-update times only)

Last catalog update 2026-09-28

CDP quality counters 51 calls and 10 unique payers in 30 days, last call 2026-09-28 (catalog-reported, not verified on chain)

Category (keyword rule) inference/llm

Templated path no

x402Version in catalog 2

Service name / tags Chit402 · treasury, possession-book, spend-receipt, x402, usdc

Unpaid probe (census of 2026-09-30)

Field Value

Probed at 2026-09-30T23:12:17.120Z

HEAD 402

GET 402

Verdict live live: valid 402 to an unpaid GET

402 carried in header+body

x402Version in the 402 2

accepts[0] {"scheme":"exact","network":"eip155:8453","amount":"2000","payTo":"0x23f713411c30BBd9A989c9cbC22EB0b55F7f7334","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","maxTimeoutSeconds":120,"extra":{"name":"USD Coin","version":"2"}}

Live amount equals catalog price yes

Live payTo equals catalog payTo yes

extensions.bazaar in the 402 yes

PAYMENT-REQUIRED header yes

WWW-Authenticate offer none

Content type / server / CORS application/json / n/a / none

Latency 6,287 ms

Error none

No hourly re-probe has reached this resource yet; the cron covers a rotating slice of 150 per hour.

On-chain facts for the payTo (public address)

Field Value

Distinct payers 4

Payments 10

USDC volume $0.03

Median payment $0.002

First / last payment 2026-08-30 / 2026-09-25

Sampler-shaped share of payments 100.0%

Payers that are not samplers 0

Source forensics-2026-09-30

Address 0x23f713411c30BBd9A989c9cbC22EB0b55F7f7334

Declared input and output (extensions.bazaar)

{
 "input": {
  "body": {
   "max_tokens": 500,
   "messages": [
    {
     "content": "Hello",
     "role": "user"
    }
   ],
   "model": "xfuel/auto"
  },
  "bodyType": "json",
  "method": "POST",
  "type": "http"
 },
 "output": {
  "type": "json",
  "example": {
   "choices": [
    {
     "finish_reason": "stop",
     "index": 0,
     "message": {
      "content": "Hello!",
      "role": "assistant"
     }
    }
   ],
   "created": 1700000000,
   "id": "chatcmpl-abc123",
   "model": "xfuel/auto",
   "object": "chat.completion",
   "usage": {
    "completion_tokens": 5,
    "prompt_tokens": 10,
    "total_tokens": 15
   },
   "xfuel": {
    "verify_url": "https://api.xfuel.app/receipt/xfuel-abc123"
   }
  }
 }
}

Try it (unpaid: shows the 402)

curl -si -X POST 'https://api.xfuel.app/v1/chat/completions' -H 'accept: application/json' -H 'content-type: application/json' --data '{}'

The catalog declares POST. A 402 answer carries the payment requirements in the JSON body and, for x402 v2, base64 in the PAYMENT-REQUIRED header. This page never sends a payment.

Paid checks (x402, USDC on Base)

GET https://bazaar.agentexchange.work/r/0746958bfdfe/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"0746958bfdfe"} places this resource at the top of the report and search pages for 30 days for $1.00, labelled. Unpaid requests answer 402 with the terms. Pricing.

Catalog references: PayAI listing status · agentic.market (CDP Bazaar front end) · this record as JSON · all resources on api.xfuel.app.