{"uid":"cap_bjw1lCbRmxb-A04qj5KZw","slug":"agent-side-x402-cost-evaluation-and-payment-runtime-decision-procedure-b151cc36","name":"Agent-Side x402 Cost Evaluation and Payment Runtime Decision Procedure","description":"Deterministic procedure for an agent runtime that pays x402 per request: evaluate the quote before settling. Ordered checks: parse the 402 challenge fields (amount, asset, network, timeout, scheme) before payment and reject implicit amounts, gate price against 20% of task value, track cumulative micro-payment spend against run budget with pause at 80% and hard stop at 100%, compare offers across facilitators and rails and settle cheapest that passes vetting, flag price drift above 2x, double","url":"https://k2so.wrong.systems/api/services/agent-side-cost-evaluation-and-payment-runtime-d","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{"meta":{"enum":["0","1"],"type":"string","description":"Set to 1 for free metadata JSON (no payment required)"},"topic":{"type":"string","description":"Optional topic override for the decision procedure"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","title":"Agent-side x402 cost evaluation and per-request value gate paid response","$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-side-cost-evaluation-and-payment-runtime-d","procedure":"same as brief","generatedAt":"2026-01-01T00:00:00.000Z","generationSource":"deterministic"},"service":"agent-side-cost-evaluation-and-payment-runtime-d","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_jM8_35xGedOQERBll5xGH","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 plain-prose decision procedure brief helping AI agents evaluate whether a given x402 per-call cost is justified and how to gate payments at runtime.","exampleAgentPrompt":"Give me the decision procedure my agent should follow when evaluating whether a $0.002 x402 API call is worth paying at runtime — I want the full prose brief on cost evaluation and payment gating.","exampleUseCases":[{"title":"Autonomous agent payment approval gate","prompt":"My AI agent is about to pay for an x402 data service costing $0.002 USDC per call — give me the decision procedure it should run to decide whether to approve or reject the payment before committing."},{"title":"Building a cost-control policy for agent fleet","prompt":"I'm building an agent fleet on Base and need a decision procedure each agent can follow to evaluate whether per-call x402 costs are justified by the expected value — can you pull that brief for me?"},{"title":"Onboarding a new x402 service integration","prompt":"We're integrating a new x402 paid API into our agent and want to know the standard cost evaluation and payment runtime procedure so the agent doesn't overspend — fetch the official decision brief for that."}],"resultDescription":"A JSON object containing a plain-prose decision procedure brief (120+ words) advising the AI agent on how to evaluate x402 per-call costs and gate payments, along with the model used, topic, service slug, ISO-8601 generation timestamp, and generation source (llm, reasoning, or deterministic).","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 causes request rejection","Topic override ignored if format is invalid","Service may return ok:false in result if the handler fails internally","Stale or deterministic briefs may be returned depending on generation source"],"whenToPreferThis":"Choose this endpoint when an AI agent needs a structured, plain-language decision procedure specifically for evaluating whether x402 per-request micropayments are cost-justified at runtime. It is purpose-built for autonomous agent payment gating on Base/USDC and produces a prose brief directly consumable by another agent, unlike generic cost-analysis tools or static documentation.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T19:02:29.405Z","isFirstParty":false}