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Chit402 Paid AI Inference via x402
x402
Chit402 Paid AI Inference via x402 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).
Submits a paid AI inference request over the x402 USDC payment protocol, returning a receipted task ID and payment reference for treasury tracking.
Price / call$0.002
Success—
StatusUnknown
How this service works
Who paid which call — export, policy, evidence. Possession book for agent spend.
Output
Returns a JSON object with status ('accepted'), a unique task_id, the gross and net USDC amounts (in 6-decimal base units), the fee deducted, the payment rail used, a payment_ref (on-chain transaction reference on Base), and a verify_url pointing to a hosted receipt on xfuel.app for treasury verification.
Example use cases
Agent fleet spend tracking
“My autonomous agent at 0xDef...456 needs to run an AI call on Chit402 using xfuel/auto — have it ask 'Summarize this contract clause: indemnification applies to all third-party claims' with a 300-token budget, settle on Base in USDC, and return the receipt URL so I can add it to the treasury log.”
Auditable AI output for compliance
“Submit an inference request to Chit402 from wallet 0x789...abc for the message 'Generate a risk disclaimer for a DeFi product' using 400 max tokens on the xfuel/auto model, pay in USDC on Base, and give me the task ID and payment reference so we have evidence for our audit trail.”
Cost-plus AI inference for product pipeline
“I need to call Chit402's inference endpoint from wallet 0x111...222 with the message 'Write a one-paragraph product description for a Bluetooth speaker' — use xfuel/auto, cap at 500 tokens, pay in USDC on Base, and show me the fee amount and verify URL when it's done.”
Technical details
Endpoint
POSThttps://api.chit402.com/v1/responsesWhen to prefer
Choose this endpoint when you need verifiable, receipted AI inference paid per-call in USDC on Base via the x402 protocol — especially for autonomous agent fleets that require treasury reconciliation, spend export, or compliance evidence. Prefer it over generic OpenAI-compatible endpoints when on-chain payment proof, cost-plus pricing transparency, and per-call receipt URLs are required for auditing or policy enforcement.
Side effects
- Insufficient USDC balance or payment failure — payment not settled, task rejected
- Invalid or unsupported model_id — returns error indicating model not found
- Malformed messages array (missing role or content) — validation error returned
- Unsupported chain_id or rail — only 'base' and 'usdc' are accepted
- max_tokens exceeds model limits — request rejected or truncated
- Invalid sender address format — request rejected with address parse error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| amount | string | Gross task value in USDC base units (6 decimals) |
| sender | string | 0x address that owns/pays for the task |
| payment | object | |
| chain_id | string | Settlement chain; "base" for USDC settlement |
| messages | array | OpenAI-style chat messages array |
| model_id | string | Model id from GET /v1/models; xfuel/auto routes automatically |
| input_hash | string | keccak256 of your input (optional; for proof binding) |
| max_tokens | integer | Output token budget (default 500) |
| message_type | string | Task type; only inference_request is supported via x402 |
Output
Schema · Response
{
"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"
}
}Tags
x402
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