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Pre-purchase Refund-Destination Binding Verification Procedure
x402
Pre-purchase Refund-Destination Binding 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 2026-10-30).
Returns a deterministic decision-procedure brief for agents to verify where a refund will land before paying a merchant via x402
Price / call$0.002
Success—
StatusDown
How this service works
Deterministic pre-purchase procedure: an agent verifies where a refund will land before paying a merchant. Inputs: declared refund address, payer wallet, session-wallet expiry, merchant refund terms, rail refund mechanics. Outputs: execute, require-binding, or abort with evidence. Checks declared refund address control, payer-vs-beneficiary divergence, session-wallet expiry as a refund sink, and merchant refusal handling. Prevents the classic loss where the receipt stops at paid and the refund
Output
A structured brief containing a deterministic decision procedure in prose form, covering: how to verify the declared refund address is actually controlled by the correct party, how to identify divergence between the payer entity and refund beneficiary, how to assess whether a session wallet expiry could act as a refund sink, and how to handle merchant refusal. The response includes a generatedAt timestamp, the generation source (llm/reasoning/deterministic), the service slug, and success/failure indicators.
Example use cases
Autonomous agent pre-payment safety check
“I'm about to pay an x402 merchant on Base — before I authorize the payment, can you run the refund-destination binding verification to make sure my refund would actually come back to me and not get lost in a session wallet or go to the wrong address?”
Divergent payer and refund beneficiary detection
“The merchant I'm about to pay has a different entity listed as the refund beneficiary than the wallet I'm paying from — can you run the refund-destination binding verification procedure to figure out if this is a red flag and what I should do?”
Merchant refund refusal handling guidance
“I asked this x402 merchant for their declared refund address before paying and they refused to provide it — what does the refund-destination binding verification procedure say I should do in this situation?”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/pre-purchase-refund-destination-binding-verifica?utm_source=zero.xyzWhen to prefer
Use this endpoint when an autonomous agent is about to execute an x402 payment and needs a deterministic, blunt decision procedure — not marketing copy — for verifying refund destination binding. Prefer this over generic refund-trust or refund-path endpoints (x402-refund-path-and-funds-return-trust-procedur) when you specifically need pre-purchase binding verification covering address control, entity divergence, session-wallet expiry risk, and merchant refusal handling as a unified checklist.
Side effects
- Payment not included — endpoint returns HTTP 402 requiring USDC payment before delivering brief
- Invalid method — only GET, HEAD, DELETE are accepted; POST/PUT return an error
- Network or provider outage — K-2SO agent may be temporarily offline, returning 503
- Malformed query parameters — unrecognized topic override values may return default procedure instead of customized one
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": "pre-purchase-refund-destination-binding-verifica",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "pre-purchase-refund-destination-binding-verifica",
"provider": "K-2SO"
}
}Tags
x402
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