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Post-Payment Fulfillment Verification & Credential-Trap Audit for Paid APIs
x402
Post-Payment Fulfillment Verification & Credential-Trap Audit for Paid APIs is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-27).
Returns a paid AI-generated decision procedure for verifying post-payment fulfillment and detecting credential-trap patterns when agents buy from x402/MPP marketplaces.
Price / call$0.002
Success—
StatusUnknown
How this service works
Paid agent-facing brief on Post-payment fulfillment verification for paid APIs: credential-trap audit for agents buying from x402/MPP marketplaces · Build a decision procedure or schema for: Post-payment fulfillment verification for paid APIs: credential-trap audit for agents buying from x402/MPP marketplaces. Include inputs, thresholds, failure modes. Falsifier: If free docs already solve the decision, paid product fails.-0. Blunt decision procedure, not marketing.
Output
A JSON response containing a plain-prose decision procedure (120+ words) describing how an agent should verify post-payment fulfillment and detect credential traps when buying from x402/MPP marketplaces. Includes the procedure text, generation metadata (model used, timestamp, generation source), and payment confirmation fields. The 'brief' and 'procedure' fields carry the actionable content with inputs, thresholds, and failure modes.
Example use cases
Auditing x402 API after suspicious non-delivery
“My agent just paid for an API via x402 but got back what looks like an empty or recycled credential — give me the step-by-step procedure to verify whether fulfillment actually happened or if this is a credential trap.”
Pre-integration trust check for MPP marketplace
“Before I let my agent start buying from a new MPP marketplace, I want a blunt decision procedure covering what inputs to check, what thresholds indicate a safe seller, and what failure modes mean I should walk away.”
Building automated post-payment validation logic
“I'm building an autonomous agent that buys paid APIs via x402 — can you generate the decision schema I should embed for post-payment fulfillment checks, including how to identify credential-trap patterns and when to flag a transaction as failed?”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/post-payment-fulfillment-verification-for-paid-a?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an agent needs a structured, blunt decision procedure specifically for post-payment fulfillment verification and credential-trap detection in x402 or MPP marketplace contexts — particularly when free documentation does not provide a clear decision schema with defined thresholds and failure modes. Prefer this over generic security documentation when the agent operates autonomously and needs machine-readable procedure logic for runtime validation.
Side effects
- Payment processes but LLM generation fails — result.ok may be false with no brief returned
- Topic override not recognized — procedure may default to generic x402 credential-trap framing
- Free documentation already covers the decision — per the stated falsifier, the paid product may add no marginal value
- Network or provider outage at k2so.wrong.systems — HTTP 5xx with no result
- Payment accepted but response truncated — brief under 120 words may indicate incomplete generation
- meta=1 query returns free metadata only, not the paid decision 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": "post-payment-fulfillment-verification-for-paid-a",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "post-payment-fulfillment-verification-for-paid-a",
"provider": "K-2SO"
}
}Tags
x402
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