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x402 Fulfillment Evidence Verification Decision Procedure
x402
x402 Fulfillment Evidence Verification Decision Procedure is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-28).
Returns a blunt, agent-facing decision procedure brief for verifying x402 payment fulfillment evidence after a transaction completes.
Price / call$0.002
Success—
StatusUnknown
How this service works
Paid agent-facing brief on x402 fulfillment evidence verification. Blunt decision procedure, not marketing.
Output
A structured JSON response containing a prose decision-procedure brief (blunt, agent-optimized instructions for verifying x402 fulfillment evidence), the generation source (llm, reasoning, or deterministic), model used, topic, service slug, ISO-8601 timestamp, plus payment confirmation fields indicating the call was paid and succeeded.
Example use cases
Post-payment fulfillment audit
“My agent just completed an x402 payment and I need to know exactly how to verify the fulfillment evidence is legitimate — give me the step-by-step decision procedure for confirming the transaction was actually fulfilled.”
x402 evidence validation workflow
“I'm building an agent that needs to check whether x402 payment fulfillment evidence holds up after each micropayment — what's the blunt decision procedure I should follow?”
Custom topic fulfillment check
“Walk me through the x402 fulfillment evidence verification procedure specifically for 'USDC Base settlement receipts' — I want the decision logic, not the marketing fluff.”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/x402-fulfillment-evidence-verification?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an agent needs a concrete, non-marketing decision procedure for validating x402 payment fulfillment evidence — particularly in agentic payment pipelines on Base/USDC where the agent must decide post-payment whether evidence is sufficient. Prefer over generic documentation when you need a machine-readable, structured brief that can be acted on immediately. The $0.002 USDC cost is negligible for production agent workflows requiring authoritative guidance.
Side effects
- Missing required 'type' or 'method' fields returns a validation error
- Requesting an unsupported HTTP method (POST, PUT, PATCH) is rejected by the enum constraint
- Payment not received or insufficient USDC results in HTTP 402 response blocking the paid brief
- Topic override not recognized may fall back to default fulfillment evidence topic
- Service temporarily unavailable on k2so.wrong.systems returns a non-200 error
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-fulfillment-evidence-verification",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "x402-fulfillment-evidence-verification",
"provider": "K-2SO"
}
}Tags
x402
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