{"uid":"cap_oh9iEis6JSW36tzNYucrm","slug":"iban-check-transaction-sign-rfc-8785-canonicalization-sha-256-merkle-f4cd19a7","name":"IBAN Check Transaction Sign – RFC 8785 Canonicalization + SHA-256 + Merkle + HMAC-SHA256","description":"Enterprise microservice and autonomous AI agent hub: ISO 13616 IBAN (#6), Romanian CUI Modulo-11 & EU VIES (#7), UBL 2.1 e-Factura XML (#4), and RFC 9562 UUIDv7 Idempotency (#18).","url":"https://api.ibancheck.co.uk/api/sign-transaction?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"payload":{"type":"object"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.004","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":"$0.004/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_1MukZO-kml2f41hM_fYWn","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.004","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Canonicalizes a JSON payload using RFC 8785 key-sorted format, computes a SHA-256 hash, generates a Merkle leaf, and produces an HMAC-SHA256 audit signature for tamper-evident transaction signing.","exampleAgentPrompt":"Sign and seal this transaction payload with a tamper-evident audit signature — canonicalize it using RFC 8785 key-sorted JSON, compute its SHA-256 hash and Merkle leaf, then return the HMAC-SHA256 audit signature so I can verify it hasn't been altered later.","exampleUseCases":[{"title":"Audit seal for invoice submission","prompt":"Before I submit this invoice JSON to the accounting system, seal it with a cryptographic audit signature — canonicalize it with RFC 8785, hash it with SHA-256, and give me the HMAC so I can prove the payload was untouched."},{"title":"Tamper-proof AI agent action log","prompt":"My AI agent just executed a financial action — take the action record JSON and sign it with your RFC 8785 canonicalization, SHA-256 hash, and HMAC-SHA256 so I have a Merkle-compatible audit trail."},{"title":"Compliance signature for payment record","prompt":"I need a verifiable cryptographic seal on this payment transaction object for compliance purposes — canonicalize the JSON, generate the SHA-256 and Merkle leaf, and return the full HMAC audit signature."}],"resultDescription":"Returns the RFC 8785 key-sorted canonical form of the input JSON, a SHA-256 hash of that canonical form, a Merkle leaf derived from the hash, and an HMAC-SHA256 audit signature — providing a complete tamper-evident cryptographic seal for the submitted payload.","failureModes":["Malformed or non-object payload returns a validation error","Missing payload field results in a 400 Bad Request","Invalid JSON structure causes canonicalization failure","HMAC key misconfiguration may result in authentication errors","Network timeout on slow payloads"],"whenToPreferThis":"Choose this endpoint when you need a full cryptographic audit bundle — RFC 8785 canonicalization, SHA-256 hashing, Merkle leaf, and HMAC-SHA256 in a single call — especially for financial transactions, AI agent action logs, or compliance records where tamper-evidence is required. Prefer over simpler hash endpoints when Merkle compatibility or HMAC audit signatures are specifically needed.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-13T12:37:07.782Z","isFirstParty":false,"canonicalSlug":"iban-check-transaction-sign-rfc-8785-canonicalization-sha-256-merkle-f4cd19a7"}