Validate an IBAN structurally before you pay or store it
Validate an IBAN structurally before you pay or store it: ISO 7064 mod-97 check digits plus the official per-country length and BBAN layout (~90 countries), returning the bank/branch/account breakdown for FR, DE, ES, IT, BE and NL. Structural validation only — no BIC directory lookup (SWIFT's BIC registry is proprietary) and no proof the account exists. Local, instant. ?attest=1 → Ed25519-signed.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
1235 msmedian answer time
$0.001listed price per call
$0.001price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://staging.402utils.com/v1/iban-check
| Category | Company and compliance |
|---|---|
| Provider host | staging.402utils.com |
| Networks | eip155:84532 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.001 | 1235 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"iban": "FR76 3000 6000 0112 3456 7890 189"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"description": "Query param `iban` (spaces tolerated, case-insensitive).",
"properties": {
"attest": {
"description": "Set to 1 for an Ed25519-signed attestation of the result (audit trail).",
"type": "string"
},
"iban": {
"description": "The IBAN to validate, e.g. FR7630006000011234567890189.",
"type": "string"
}
},
"required": [
"iban"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"additionalProperties": false,
"properties": {
"accountNumber": {
"type": "string"
},
"attestation": {
"description": "Present only with ?attest=1. Ed25519 signature over the canonical result; verify against /.well-known/402utils-attestation.json.",
"properties": {
"alg": {
"const": "Ed25519",
"type": "string"
},
"payload": {
"properties": {
"endpoint": {
"type": "string"
},
"kid": {
"description": "Key id \u2014 matches a key in the .well-known document.",
"type": "string"
},
"resultSha256": {
"description": "SHA-256 of the canonical JSON of the result (attestation excluded).",
"type": "string"
},
"ts": {
"format": "date-time",
"type": "string"
}
},
"type": "object"
},
"sig": {
"description": "base64url Ed25519 signature over the canonical JSON of payload.",
"type": "string"
}
},
"type": "object"
},
"bankCode": {
"description": "Present for FR/DE/ES/IT/BE/NL.",
"type": "string"
},
"bban": {
"description": "Basic Bank Account Number (the IBAN minus country + check digits).",
"type": "string"
},
"branchCode": {
"type": "string"
},
"checkDigitsValid": {
"description": "ISO 7064 mod-97 result.",
"type": "boolean"
},
"country": {
"description": "ISO country code from the first two characters.",
"type": "string"
},
"formatValid": {
"description": "Known country code and correct total length.",
"type": "boolean"
},
"length": {
"type": "integer"
},
"valid": {
"description": "formatValid AND checkDigitsValid.",
"type": "boolean"
}
},
"required": [
"valid",
"country",
"checkDigitsValid",
"formatValid",
"bban",
"length"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}