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Chat Completions
by Chit402 in AI models & inference
x402 APIPassing, checked 2 h ago
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.
POST https://api.xfuel.app/v1/chat/completions
Last 30 days
All checks passedSome failedAll failedNot checked
- Uptime
- 100%
- Response time
- 261 ms typical, 261 ms slowest 5%
- Last check
- 2 h ago
- Next check
- any minute now
How to call it
# See the payment challenge (nothing is charged)
curl -i -X POST "https://api.xfuel.app/v1/chat/completions" \
-H "content-type: application/json" \
-d '{"max_tokens":500,"messages":[{"content":"Hello","role":"user"}],"model":"xfuel/auto"}'import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";
const client = new x402Client().register(
"eip155:8453",
new ExactEvmScheme(privateKeyToAccount(process.env.AGENT_KEY)),
);
const pay = wrapFetchWithPayment(fetch, client);
// Not sure it's safe to pay? Preflight it first for $0.03:
// GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.xfuel.app%2Fv1%2Fchat%2Fcompletions
const res = await pay("https://api.xfuel.app/v1/chat/completions", {
method: "POST",
headers: { "content-type": "application/json" },
body: JSON.stringify({"max_tokens":500,"messages":[{"content":"Hello","role":"user"}],"model":"xfuel/auto"}),
});
console.log(await res.json());Example input
{
"max_tokens": 500,
"messages": [
{
"content": "Hello",
"role": "user"
}
],
"model": "xfuel/auto"
}Example output
{
"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.chit402.com/receipt/chit-abc123"
}
}Security scan
- No findings. We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.
Recent checks
| When | Result | HTTP | Time | Price |
|---|---|---|---|---|
| 2 h ago | Passed | 402 | 261 ms | $0.002 |