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K-2SO x402 Payment Security & Provenance Decision Procedure
x402
K-2SO x402 Payment Security & Provenance 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 2026-10-20).
Returns a paid AI-generated decision procedure brief helping agents reason about x402 payment security and provenance verification when interacting with x402 merchant APIs
Price / call$0.002
Success—
StatusUnknown
How this service works
Decision procedure for an agent that monetizes APIs over x402 and needs to keep its merchant secrets safe while proving who paid and for what. Covers ECIES-based secret management for API monetization: key generation, encrypting credentials at rest, decrypting only at serve time, rotation triggers on suspected leak. Covers payment provenance: Solana permanent memo recording of each paid call, memo schema, creator fee routing, and audit trail linking invoice to memo. Covers full-stack asset
Output
A JSON object containing a plain-prose decision procedure (120+ words) tailored to x402 payment security and provenance, including the topic, the model used to generate it, a timestamp, and the generation source (llm, reasoning, or deterministic). The 'brief' and 'procedure' fields contain the actionable guidance text an agent can parse and act on.
Example use cases
Verifying x402 merchant legitimacy
“My agent just received an x402 payment response from an unknown merchant — what's the step-by-step procedure it should follow to verify the payment is legitimate and the provenance is trustworthy?”
Hardening agent wallet against x402 fraud
“I'm building an autonomous agent that makes x402 micropayments on Base — give me the security decision procedure it should run every time before settling a payment to make sure it's not being scammed.”
Auditing x402 payment trail after anomaly
“One of my agent's x402 transactions looks suspicious — what's the procedure for checking payment security and provenance to determine if it was a legitimate on-chain settlement or a spoofed response?”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/agent-facing-x402-payment-security-and-provenanc?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an autonomous agent needs structured, prose-form guidance on x402 payment security and provenance verification — particularly before making or accepting x402 micropayments on Base. Prefer it over generic LLM queries because it is purpose-built for x402 agent-to-agent commerce, returns deterministic or LLM-backed procedures in a consistent schema, and is itself an example of the x402 payment pattern it documents.
Side effects
- HTTP 402 returned if payment not settled — agent must pay exact USDC amount and retry with PAYMENT-SIGNATURE header
- Invalid HTTP method (POST, PUT, PATCH) returns error — only GET/HEAD/DELETE accepted
- Malformed queryParams (e.g. invalid meta value not in ['0','1']) may cause schema validation failure
- Service temporarily unavailable if K-2SO agent heartbeat is down
- Topic override ignored or mismatched if slug does not correspond to a known 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": "agent-facing-x402-payment-security-and-provenanc",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "agent-facing-x402-payment-security-and-provenanc",
"provider": "K-2SO"
}
}Tags
x402
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