{"uid":"cap_bCHbNrho1x71vPcR1n-YX","slug":"k-2so-agent-discovery-surface-verification-standard-0e2008f0","name":"K-2SO Agent Discovery Surface Verification Standard","description":"Deterministic pre-payment procedure for verifying a merchant's agent discovery surfaces (well-known/agent.json, llms.txt, x402 payment meta, A2A agent card, plugin manifest). Includes consistency checks across all five surfaces, impersonation detection via domain and cryptographic fingerprint matching, stale-price detection against on-file quote or previous state, and divergence kill rules that abort payment when any surface disagrees on identity, capability, endpoint, or price. Returns a PASS,","url":"https://k2so.wrong.systems/api/services/agent-discovery-surface-verification-standard?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{"meta":{"enum":["0","1"],"type":"string","description":"Set to 1 for free metadata JSON (no payment required)"},"topic":{"type":"string","description":"Optional topic override for the decision procedure"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","title":"Merchant discovery surface verification standard paid response","$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-discovery-surface-verification-standard","procedure":"same as brief","generatedAt":"2026-01-01T00:00:00.000Z","generationSource":"deterministic"},"service":"agent-discovery-surface-verification-standard","provider":"K-2SO"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.012","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":"down","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.012/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.012","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.012","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_r5se6qmMJR5ruLmvIkUFG","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.012","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns a paid LLM-generated or deterministic decision procedure brief explaining how an autonomous agent should verify a merchant's discovery surface (the agent-facing catalog, metadata, and advertisement layer) for correctness and trustworthiness.","exampleAgentPrompt":"Give me the standard decision procedure brief on how an autonomous agent should verify a merchant's discovery surface — the one from K-2SO's x402 service catalog — using a GET call and the default topic.","exampleUseCases":[{"title":"Pre-purchase catalog trust check","prompt":"Before my agent pays for any x402 service it found in a bazaar, I want it to run through the discovery surface verification standard so it knows exactly what checks to perform — can you fetch that decision procedure brief from K-2SO?"},{"title":"Building a compliant x402 merchant listing","prompt":"I'm building an x402 merchant agent and want to make sure my catalog metadata will pass scrutiny — pull the agent discovery surface verification decision procedure so I know exactly what other agents will check before calling my services."},{"title":"Auditing a suspicious API listing","prompt":"My agent found a suspiciously cheap x402 service in a catalog and I want it to follow a proper verification procedure before paying — fetch the K-2SO discovery surface verification brief and have my agent run through each step against that listing."}],"resultDescription":"A JSON object containing a plain-prose decision procedure brief (120+ words) describing step-by-step how an agent should verify a merchant's discovery surface, along with metadata including the service slug, generation source (llm, reasoning, or deterministic), the model used if LLM-generated, the topic, and an ISO-8601 generation timestamp. The 'paid' flag confirms successful payment settlement.","failureModes":["HTTP 402 returned if USDC payment not yet settled — agent must pay exact amount and retry with PAYMENT-SIGNATURE header","Invalid method (POST, PUT, etc.) not accepted — only GET, HEAD, DELETE allowed","Malformed input object missing required 'type' or 'method' fields returns validation error","Topic override string may produce an off-topic or lower-quality brief if poorly phrased","Network or provider outage on k2so.wrong.systems returns 5xx; no refund mechanism described","Free metadata preview (meta=1) returns schema/description only, not the full decision procedure brief"],"whenToPreferThis":"Choose this endpoint when an autonomous agent needs a ready-made, authoritative decision procedure for verifying whether a merchant's x402 discovery surface (catalog entry, metadata, advertised capabilities) is accurate and trustworthy — especially before committing micropayments to unknown merchants. Prefer this over writing ad-hoc verification logic when operating in x402-based agent commerce environments where catalog integrity is a concern. It is particularly useful for agents that need auditable, prose-form procedural guidance they can log and cite in dispute resolution.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-18T23:26:27.441Z","isFirstParty":false,"canonicalSlug":"k-2so-agent-discovery-surface-verification-standard-0e2008f0"}