# IBAN Validation (ISO 13616 MOD-97)

> IBAN Validation (ISO 13616 MOD-97) is a paid API for AI agents from api.aventtech.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-10).

Validates an IBAN using MOD-97 checksum, structural checks, and country-length verification against the IBAN registry, returning validity status, country, and diagnostic details.

## Facts

- Endpoint: GET https://api.aventtech.com/validate/iban?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/iban-validation-iso-13616-mod-97-bc3a9291
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UXr63vgsg8SCBdtcWAeEp

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability iban-validation-iso-13616-mod-97-bc3a9291
```

Example prompt: Can you check whether this IBAN is valid: GB29 NWBK 6016 1331 9268 19?

## When to prefer this

Use this endpoint when you need a fast, deterministic, offline-style IBAN validation with full diagnostic output — no upstream bank registry calls, no side effects, and no latency from external dependencies. Prefer it over bank-connectivity solutions when you only need format/checksum validity, not account existence.

## Known failure modes

- Missing 'iban' query parameter returns a 400 or error response
- Malformed request returns an error
- Very long or nonsensical strings may return invalid with a structural diagnostic
- Rate limiting or payment failure returns a 402 or 429

## How this service works

Validate an IBAN and check whether a bank account number is valid. Verifies the ISO 13616 MOD-97 checksum, structure and country length against the IBAN registry, and returns validity, the country, the BBAN and a formatted IBAN. Instant, deterministic bank account number validation and verification for any European or international IBAN.

## Output

Returns a validity boolean, the detected country code, MOD-97 checksum pass/fail, structural conformance against the IBAN registry (expected vs actual length), and diagnostic details explaining any failure reason.

## Request schema (JSON Schema)

```json
{
 "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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "iban"
     ],
     "properties": {
      "iban": {
       "type": "string",
       "description": "IBAN to validate; spaces and dashes allowed"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "valid": true,
  "country": "DE",
  "checksumValid": true,
  "expectedLength": 22
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/iban-validation-iso-13616-mod-97-bc3a9291/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.aventtech.com](https://www.zero.xyz/host/api.aventtech.com/llms.txt)