{"uid":"cap_md9-JfzxTDIJR1HbQ5yjI","slug":"post-settlement-price-integrity-audit-for-x402-payments-c75646a0","name":"Post-Settlement Price Integrity Audit for x402 Payments","description":"Paid agent-facing brief on Post-settlement price integrity audit for x402 payments: procedure that verifies the USDC actually charged to the payer matches the price declared in the 402 challenge terms, detects quote-vs-charge drift, per-rail fee leakage, and double-charge on re-probe, with an evidence bundle a payer can dispute with. · Build a decision procedure or schema for: Post-settlement price integrity audit for x402 -0. Blunt decision procedure, not marketing.","url":"https://k2so.wrong.systems/api/services/post-settlement-price-integrity-audit-for-x402-p?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{"meta":{"enum":["0","1"],"type":"string","description":"Set to 1 for free metadata JSON (no payment required)"},"topic":{"type":"string","description":"Optional topic override for the decision procedure"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","title":"Post-settlement price integrity audit for x402 payments: procedure tha paid response","$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 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brief","generatedAt":"2026-01-01T00:00:00.000Z","generationSource":"deterministic"},"service":"post-settlement-price-integrity-audit-for-x402-p","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":"down","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_aNbE8IErfJMhN37ASPsoS","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":"Generates a decision procedure brief that audits whether USDC actually charged in an x402 payment matches the declared price, detecting quote-vs-charge drift, fee leakage, and double-charge scenarios with a disputable evidence bundle.","exampleAgentPrompt":"Give me the blunt decision procedure for auditing post-settlement price integrity in an x402 payment — I need to verify the USDC charged actually matches the price in the 402 challenge terms and detect any quote drift, fee leakage, or double-charge on re-probe.","exampleUseCases":[{"title":"Detecting x402 quote-vs-charge drift","prompt":"I just settled an x402 payment but I think the USDC charged was higher than the price declared in the original 402 challenge — give me the audit procedure to verify if there was drift and build an evidence bundle I can use to dispute it."},{"title":"Catching double-charge on re-probe","prompt":"My agent re-probed an x402 endpoint and I'm worried it got charged twice — walk me through the decision procedure to detect a double-charge and figure out what evidence I'd need to dispute it."},{"title":"Per-rail fee leakage audit","prompt":"I want to audit whether the per-rail fees on my x402 USDC settlements are leaking beyond what was declared in the 402 terms — get me the procedure to detect that and document it."}],"resultDescription":"A paid JSON response containing a decision procedure brief (prose and structured procedure) for auditing x402 post-settlement price integrity, including detection logic for quote-vs-charge drift, per-rail fee leakage, and double-charge on re-probe, plus an evidence bundle schema a payer can use for dispute — along with generation metadata (model, timestamp, generation source).","failureModes":["Payment not provided or insufficient USDC — returns 402 challenge requiring payment","Invalid method (non-GET/HEAD/DELETE) — rejected by schema","Network or provider unavailability at k2so.wrong.systems — connection failure","LLM generation failure — result.ok may be false with no brief returned","Invalid queryParams values — schema validation error"],"whenToPreferThis":"Choose this endpoint when an AI agent or developer needs a concrete, blunt decision procedure for auditing x402 payment settlement integrity — specifically verifying USDC charge accuracy, detecting drift from declared prices, or building dispute evidence. Prefer this over generic payment auditing guides when operating in the x402/Base/USDC ecosystem and needing agent-actionable logic rather than marketing material.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T19:25:18.070Z","isFirstParty":false,"canonicalSlug":"post-settlement-price-integrity-audit-for-x402-payments-c75646a0"}