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x402 Refund-Oracle Verification Procedure
x402
x402 Refund-Oracle Verification Procedure is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status down (last checked 2026-10-19).
Grades merchant refund claims on x402 payment rails by verifying signed attestations and on-chain reversal records before an agent marks a refund as received.
Price / call$0.002
Success—
StatusDown
How this service works
Decision procedure that grades merchant refund claims on x402 rails before an agent writes the reversal off as received. Inputs: merchant-signed refund attestation, on-rail reversal record, original payment id and settlement window. Rules: 1) attestation must be signed by the payee key that received the original payment; 2) reversal record must sit on the same rail and network as the original payment and land within 2 settlement cycles; 3) attestation without an on-rail reversal record means
Output
A JSON object containing an ok boolean, a 'brief' field with plain-prose decision procedure text (120+ words) explaining whether the refund claim passes or fails verification, the topic, service slug, generation source (llm, reasoning, or deterministic), and an ISO-8601 timestamp. The result indicates whether the attestation and reversal record satisfy all three verification rules.
Example use cases
Autonomous agent refund acceptance gate
“I just got a refund attestation from a merchant on x402 rails — before my agent marks the reversal as received, can you run the oracle verification procedure to confirm the attestation is signed by the original payee key and the on-chain reversal record matches the original payment ID and settlement window?”
Disputed refund integrity check
“A merchant claims they issued a refund for payment ID txn-8821 on the Base x402 rail, but I'm not sure the reversal actually landed on-chain within the required settlement cycles — can you grade their refund claim and tell me whether it passes or fails the verification rules?”
Automated refund audit before reconciliation
“Before I reconcile this batch of x402 payments, I need to verify that the merchant refund attestation for order #5543 is valid — check that it has a corresponding on-rail reversal record and that the payee key signature is correct.”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/x402-refund-oracle-verification-procedure?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to validate a merchant-issued refund on x402 payment rails before marking the reversal as received or completing reconciliation. Prefer this over generic refund checks when you need x402-specific rule enforcement: payee key signature verification, same-rail reversal confirmation, and settlement-window compliance. Particularly valuable for unattended agents that cannot manually inspect on-chain data.
Side effects
- Attestation not signed by original payee key — claim fails rule 1
- Reversal record on different rail or network than original payment — claim fails rule 2
- Reversal landed outside 2-settlement-cycle window — claim fails rule 2
- Attestation present but no on-rail reversal record found — claim fails rule 3
- Missing or malformed payment ID — unable to look up original payment
- Payment required (402) if not including valid x402 payment header
- Topic override not recognized — falls back to default procedure
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": "x402-refund-oracle-verification-procedure",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "x402-refund-oracle-verification-procedure",
"provider": "K-2SO"
}
}Tags
x402
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