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IBAN Check Transaction Sign – RFC 8785 Canonicalization + SHA-256 + Merkle + HMAC-SHA256
x402
IBAN Check Transaction Sign – RFC 8785 Canonicalization + SHA-256 + Merkle + HMAC-SHA256 is a paid API for AI agents from api.ibancheck.co.uk, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-13).
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.
Price / call$0.004
Success—
StatusUnknown
How this service works
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).
Output
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.
Example use cases
Audit seal for invoice submission
“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.”
Tamper-proof AI agent action log
“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.”
Compliance signature for payment record
“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.”
Technical details
Endpoint
POSThttps://api.ibancheck.co.uk/api/sign-transaction?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| payload | object |
Tags
x402
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