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Chit402 Chat Completions
x402
Chit402 Chat Completions is a paid API for AI agents from api.chit402.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Runs OpenAI-compatible chat completions paid per-call with real USDC on Base or Solana via the x402 payment protocol, returning a signed receipt.
Price / call$0.002
Success—
StatusUnknown
How this service works
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.
Output
Returns an OpenAI-compatible chat completion object alongside a signed payment receipt and a public verify_url that can be used to confirm the on-chain USDC transaction on Base or Solana mainnet.
Example use cases
Metered agent reasoning with receipts
“I'm building an autonomous agent that needs to pay per inference and log signed receipts for accounting — use Chit402 with xfuel/auto and max 1024 tokens to answer: 'What are the key risks in a DeFi lending protocol?' and give me the verify_url for the receipt.”
Streaming crypto-paid chat response
“Stream a response from Chit402 using the xfuel/auto model at temperature 0.5 — ask it: 'Write a concise product description for a hardware crypto wallet' — enable streaming and charge my USDC on Base.”
Cost-plus quoted LLM call for audit trail
“Run a quoted, receipted inference on Chit402 — model xfuel/auto, temperature 0.2, max 256 tokens — with the prompt: 'Summarize the main use cases of zero-knowledge proofs' and return both the answer and the signed receipt URL so I can verify the payment on-chain.”
Technical details
Endpoint
POSThttps://api.chit402.com/v1/chat/completionsWhen to prefer
Choose Chit402 when you need pay-per-call LLM inference charged in real USDC on Base or Solana via the x402 protocol, with a signed on-chain receipt for every call. It is ideal for autonomous agents that must audit or account for AI spend cryptographically, or for applications that want metered inference without a subscription. Prefer it over standard OpenAI-compatible hosts when the x402 payment flow, cost-plus pricing transparency, or receipt verifiability is a requirement.
Side effects
- Payment rejected or insufficient USDC balance — 402 Payment Required
- Invalid or unsupported model ID — 400 Bad Request
- Malformed messages array (missing role or content) — 422 Unprocessable Entity
- Rate limit or quota exceeded — 429 Too Many Requests
- Model unavailable or inference timeout — 503 Service Unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| model | string | Model id from GET /v1/models; xfuel/auto routes automatically |
| stream | boolean | |
| messages | array | OpenAI-style chat messages array |
| max_tokens | integer | Output token budget |
| temperature | number |
Output
Schema · Response
{
"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/xfuel-abc123"
},
"object": "chat.completion",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "Hello!"
},
"finish_reason": "stop"
}
],
"created": 1700000000
}
}Tags
x402
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