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Bought Web Action Receipt Verification Standard
x402
Bought Web Action Receipt Verification Standard is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status down (last checked 2026-09-15).
Validates x402 web automation payment receipts by checking payment match, execution proof, schema conformance, idempotency, and replay resistance before certifying a page action as delivered.
Price / call$0.002
Success—
StatusDown
How this service works
Post-purchase gate for x402 web automation receipts. Checks payment match against quote, execution proof fields, result schema conformance, idempotency key reuse, and replay resistance before accepting a claimed page action as certified delivery evidence.
Output
Returns a structured JSON object with an 'ok' boolean indicating handler success, a 'paid' flag, a 'result' object containing a verification decision ('ok'), a prose 'brief' summarizing the decision procedure for agents, the service slug, model used, generation source (llm/reasoning/deterministic), and an ISO-8601 timestamp. Also includes payment metadata such as payer address and transaction ID.
Example use cases
Post-purchase gate for automated checkout
“I used an x402 agent to complete a checkout on a merchant site and got back a receipt — can you verify it against the bought-web-action receipt standard to confirm the payment matches the original quote and the execution proof is valid before I mark the task as done?”
Replay attack prevention for agent pipelines
“My automation pipeline received a web action receipt that looks like it might be a replay of an older transaction — please run it through the x402 receipt verification standard and check the idempotency key and replay resistance fields so I know if it's safe to accept.”
Schema conformance audit for receipt archiving
“Before I archive this batch of x402 web action receipts as certified delivery evidence, can you check each one for schema conformance and execution proof completeness using the bought-web-action receipt verification standard?”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/bought-web-action-receipt-verification-standardWhen to prefer
Choose this endpoint when an autonomous agent needs a post-purchase gate specifically for x402 web automation receipts, particularly when replay resistance, idempotency key reuse detection, and execution proof validation are required before accepting a claimed page action as certified delivery. Prefer this over generic payment verification when the receipt follows the x402 protocol and includes web automation execution proof fields.
Side effects
- Receipt payment amount does not match original quote — verification fails with ok:false
- Idempotency key has already been used — replay detected, receipt rejected
- Execution proof fields missing or malformed — schema conformance check fails
- HTTP method not in allowed set (GET/HEAD/DELETE) — request rejected
- Invalid or missing 'input' object — schema validation error returned
- Service temporarily unavailable — no result returned
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": "bought-web-action-receipt-verification-standard",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "bought-web-action-receipt-verification-standard",
"provider": "K-2SO"
}
}Tags
x402
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