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Paid LLM Receipt Delivery-Proof Verification Procedure
x402
Paid LLM Receipt Delivery-Proof Verification Procedure is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-30).
Returns a deterministic decision procedure for verifying that a paid LLM API call receipt proves actual delivery before consuming the output.
Price / call$0.002
Success—
StatusUnknown
How this service works
Deterministic procedure an agent runs after paying for an LLM API call, before consuming output. Checks: receipt binds the request hash, names a model run id, captures the output hash before the output is used, matches the paid amount to the quoted price, sets timeout and retry gates for slow or missing responses, and classifies refund or dispute state when the run fails. Verdicts: delivery-proven, verify-more, refuse-output-with-evidence.
Output
A structured brief containing a blunt, deterministic decision procedure in prose form, covering: request hash binding verification, model run ID validation, output hash capture before use, paid amount matching, timeout and retry rules, and refund-or-dispute state classification. Also includes metadata like generation timestamp, source, and service slug.
Example use cases
Post-payment output safety gate
“I just paid for an LLM API response via x402 — give me the step-by-step procedure to verify the receipt proves delivery, including how to check the request hash, model run ID, and whether the paid amount matches, before my agent consumes the output.”
Receipt dispute classification workflow
“My agent received a receipt after paying for an AI model run but something looks off — walk me through the decision procedure to classify this as valid, refund-eligible, or disputable based on the receipt fields.”
Timeout and retry rule lookup
“What are the exact timeout and retry rules an agent should follow when trying to verify a paid LLM receipt, and when should it stop retrying and escalate to a refund or dispute?”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/per-model-run-receipt-verification-for-paid-llm?utm_source=zero.xyzWhen to prefer
Use this endpoint when an agent has just completed a paid x402 LLM API call and needs a deterministic, step-by-step procedure to verify the receipt proves delivery before consuming or acting on the output. Prefer this over general payment validation tools when the specific concern is LLM output delivery proof, receipt hash binding, and refund/dispute classification in a per-model-run billing context.
Side effects
- Receipt fields missing or malformed — procedure may flag unverifiable state
- Network timeout fetching the procedure — agent should retry per returned retry rules
- Payment not confirmed on-chain — endpoint returns unpaid/402 response
- Topic override not recognized — falls back to default per-model-run procedure
- LLM generation failure — generationSource field indicates fallback to deterministic output
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"paid": true,
"result": {
"ok": true,
"brief": "plain prose decision procedure (120+ words)",
"model": "deepseek/deepseek-v4-flash-0731",
"topic": "string topic",
"service": "per-model-run-receipt-verification-for-paid-llm",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "per-model-run-receipt-verification-for-paid-llm",
"provider": "K-2SO"
}
}Tags
x402
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