{"uid":"cap_9naV5KYhog2Rh3cSJ0379","slug":"ddg-x402-upto-metered-settlement-fairness-verifier-76b1437d","name":"DDG x402 'upto' Metered-Settlement Fairness Verifier","description":"x402 'upto' metered-settlement fairness check: cap breach (settled>cap), over-charge / under-report vs the reported usage math (per_token/per_byte/per_second unit price), and a signed-authorization amount<=cap check. Deterministic signed verdict. $0.01.","url":"https://agents.daedalusdevelopmentgroup.com/v1/x402/upto-verify?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input","output"],"properties":{"input":{"type":"object","required":["type","method","bodyType","body"],"properties":{"body":{"type":"object"},"type":{"type":"string","const":"http"},"method":{"enum":["POST","PUT","PATCH"],"type":"string"},"bodyType":{"enum":["json","form-data","text"],"type":"string"}},"additionalProperties":true},"output":{"type":"object","required":["type","example"],"properties":{"type":{"type":"string"},"example":{"ok":true}},"additionalProperties":true}}},"responseSchema":{"type":"json","example":{"ok":true}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_PwwaJR0azSaK8VkPngBal","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Deterministically verifies x402 'upto' (capped) payment settlements for cap breaches, pricing math errors, and signed-authorization compliance, returning a signed pass/fail verdict.","exampleAgentPrompt":"Check whether this x402 'upto' settlement is fair: the cap was $0.50, the settled amount was $0.47, reported usage was 4700 tokens at $0.0001 per token, and the signed authorization covered up to $0.50 — run the fairness check and give me a signed verdict.","exampleUseCases":[{"title":"Cap breach detection for agent billing","prompt":"I just received an x402 metered response that charged me $0.82 but my 'upto' cap was set at $0.75 — can you verify whether the settlement breached my cap and return a signed verdict?"},{"title":"Per-token pricing math audit","prompt":"Audit this x402 per-token settlement for me: reported 1,200 tokens at $0.0002 per token, so expected $0.24, but they settled $0.31 — check if the pricing math is correct and flag any over-charge."},{"title":"Signed authorization amount compliance check","prompt":"Before I accept this x402 service response, verify that the signed authorization amount of $0.15 is within the agreed cap of $0.20 and that the settlement math for 500 bytes at $0.0003 per byte checks out."}],"resultDescription":"A deterministic signed verdict object with an 'ok' boolean indicating whether the settlement passed all checks (cap compliance, unit-price math correctness, and signed-authorization amount <= cap). On failure, the response indicates which check failed (cap breach, over-charge, under-report, or auth violation).","failureModes":["Settled amount exceeds cap — cap breach flagged, ok: false","Calculated price from usage × unit rate does not match settled amount — over-charge or under-report flagged","Signed authorization amount exceeds cap — authorization violation flagged","Malformed or missing required fields in request body — 400 validation error","Payment of $0.01 USDC not received — 402 payment required response blocking execution"],"whenToPreferThis":"Use this endpoint when an AI agent needs deterministic, cryptographically-signed assurance that an x402 'upto' metered payment settled correctly — specifically when you need to catch cap overruns, pricing math discrepancies (per-token, per-byte, per-second), or signed-authorization violations before accepting a service result or releasing funds. Prefer this over manual math checks when you need a tamper-evident signed verdict for auditability.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-20T12:41:57.655Z","isFirstParty":false,"canonicalSlug":"ddg-x402-upto-metered-settlement-fairness-verifier-76b1437d"}