{"uid":"cap_4bDI4xtVrWrHmJucePpBq","slug":"k-2so-x402-payment-security-provenance-decision-procedure-6d227134","name":"K-2SO x402 Payment Security & Provenance Decision Procedure","description":"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","url":"https://k2so.wrong.systems/api/services/agent-facing-x402-payment-security-and-provenanc?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{"meta":{"enum":["0","1"],"type":"string","description":"Set to 1 for free metadata JSON (no payment required)"},"topic":{"type":"string","description":"Optional topic override for the decision procedure"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","title":"x402 payment security and provenance procedure paid response","$schema":"https://json-schema.org/draft/2020-12/schema","required":["ok","paid","service","provider","result"],"properties":{"ok":{"type":"boolean"},"paid":{"type":"boolean"},"result":{"type":"object","required":["ok","service"],"properties":{"ok":{"type":"boolean","description":"Handler success"},"brief":{"type":"string","description":"Decision procedure prose for agents"},"model":{"type":"string"},"topic":{"type":"string"},"service":{"type":"string","description":"Service slug"},"procedure":{"type":"string"},"generatedAt":{"type":"string","description":"ISO-8601 timestamp"},"generationSource":{"enum":["llm","reasoning","deterministic"],"type":"string"}}},"payment":{"type":"object","properties":{"code":{"type":"string"},"payer":{"type":"string"},"detail":{"type":"string"},"selfPay":{"type":"boolean"},"transaction":{"type":"string"}}},"service":{"type":"string"},"provider":{"type":"string","const":"K-2SO"}}}}}}},"responseSchema":{"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"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_vdLeBcU3T-4DyrVivEjhY","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns a paid AI-generated decision procedure brief helping agents reason about x402 payment security and provenance verification when interacting with x402 merchant APIs","exampleAgentPrompt":"Give me the decision procedure for how my agent should verify x402 payment security and provenance before trusting a paid API response — I want the full prose brief.","exampleUseCases":[{"title":"Verifying x402 merchant legitimacy","prompt":"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?"},{"title":"Hardening agent wallet against x402 fraud","prompt":"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."},{"title":"Auditing x402 payment trail after anomaly","prompt":"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?"}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-20T18:52:59.154Z","isFirstParty":false,"canonicalSlug":"k-2so-x402-payment-security-provenance-decision-procedure-6d227134"}