{"uid":"cap_iHK7f8eTxIv08S4mSg0SS","slug":"k-2so-seller-side-buyer-authority-verification-decision-procedure-c24214f7","name":"K-2SO Seller-Side Buyer Authority Verification Decision Procedure","description":"Decision procedure for x402 data sellers: verify a paying buyer-agent's authority claim BEFORE serving data. Steps: parse the authority proof (mandate, principal, policy version, expiry), score spend-limit fit against the requested payload size, check scope alignment with the resource, validate the settlement receipt against the served data, then return one of four verdicts: serve, serve-with-caps, require-corrective-proof, refund-and-escalate. Includes kill criteria (never serve on an expired","url":"https://k2so.wrong.systems/api/services/agent-facing-decision-procedure-for-sellers-veri?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{"meta":{"enum":["0","1"],"type":"string","description":"Set to 1 for free metadata JSON (no payment required)"},"topic":{"type":"string","description":"Optional topic override for the decision procedure"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","title":"Seller-Side Buyer Authority Verification Procedure paid response","$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-decision-procedure-for-sellers-veri","procedure":"same as brief","generatedAt":"2026-01-01T00:00:00.000Z","generationSource":"deterministic"},"service":"agent-facing-decision-procedure-for-sellers-veri","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_w28n1W2q_XJf-69tmhvNx","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 LLM-generated decision procedure (prose brief) for agents verifying buyer authority on the seller side of an x402 transaction","exampleAgentPrompt":"I'm building an autonomous merchant agent on Base and need a decision procedure for verifying that a buyer actually has authority to make a purchase — can you pull the seller-side buyer authority verification brief from K-2SO?","exampleUseCases":[{"title":"Autonomous merchant buyer auth gate","prompt":"My agent is about to accept a USDC payment from an unknown buyer wallet — what's the step-by-step procedure I should follow to verify the buyer actually has authority to make this purchase before I settle it?"},{"title":"x402 seller policy onboarding","prompt":"I'm setting up a new x402 merchant agent and want a clear decision procedure for checking buyer authority on my seller side — fetch the K-2SO brief so I can bake it into my agent's logic."},{"title":"Custom topic buyer verification brief","prompt":"Give me a buyer authority verification decision procedure specifically focused on institutional buyer delegation, so my agent knows how to handle cases where the payer is acting on behalf of an organization."}],"resultDescription":"A JSON object containing a plain-prose decision procedure brief (120+ words) for seller-side buyer authority verification, the model that generated it (e.g. deepseek/deepseek-v4-flash-0731), a generation source label (llm/reasoning/deterministic), an ISO-8601 timestamp, the service slug, and provider attribution from K-2SO. Payment metadata (payer address, transaction hash) is also included when paid.","failureModes":["HTTP 402 returned if payment has not been settled — agent must pay exact USDC amount and retry with PAYMENT-SIGNATURE header","Invalid or missing method enum value causes schema validation failure","Topic override ignored or misinterpreted if not a clear natural-language string","Stale or cached generation if generationSource returns 'deterministic' rather than 'llm'","Network or provider downtime on k2so.wrong.systems results in no response"],"whenToPreferThis":"Choose this endpoint when an autonomous agent acting as a seller in an x402 micropayment flow needs a ready-made, LLM-generated decision procedure for verifying buyer authority — particularly when the agent lacks its own compliance or policy logic and needs an external brief to act on. Prefer over generic LLM prompting when you want a structured, versioned, paid procedure with provenance metadata (model, timestamp, source).","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T19:06:07.945Z","isFirstParty":false,"canonicalSlug":"k-2so-seller-side-buyer-authority-verification-decision-procedure-c24214f7"}