# ChainVerdict IBAN Validator

> ChainVerdict IBAN Validator is a paid API for AI agents from chainverdict.xyz, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Validates an IBAN structurally using country-specific length rules, character set checks, and the ISO 7064 mod-97 checksum algorithm

## Facts

- Endpoint: GET https://chainverdict.xyz/v1/validate/iban/:iban
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/chainverdict-iban-validator-3ddd93d2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OwK51e72ggx4CN_vcF-h-

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 chainverdict-iban-validator-3ddd93d2
```

Example prompt: Can you check if the IBAN GB29NWBK60161331926819 is structurally valid — correct length, characters, and checksum for a UK account?

## When to prefer this

Use this endpoint when you need a fast, cheap ($0.001), deterministic, stateless structural check of an IBAN before initiating a payment or storing bank details. Prefer this over bank-account-existence APIs when you only need format validation without a live bank lookup. Ideal as a pre-flight check in payment workflows, form validation pipelines, or fintech onboarding flows. For batch validation of multiple identifiers, consider the sibling bulk-validation endpoint.

## Known failure modes

- Invalid IBAN format returns a validation failure with reason
- Missing or malformed country prefix causes check to fail
- IBAN with wrong length for stated country returns country-rule failure
- Non-alphanumeric characters cause character set validation failure
- Incorrect mod-97 checksum returns checksum failure even if format looks correct

## How this service works

Validate an IBAN structurally: country length rules, character set and the ISO 7064 mod-97 check. Deterministic. A structurally valid IBAN is not proof the account exists, is open, or belongs to the party you are paying.

## Output

Returns a structured validation result indicating whether the IBAN passes all structural checks: correct country-specific length, valid character set (alphanumeric, uppercase), and the ISO 7064 mod-97 checksum. Does not verify account existence, open status, or ownership — purely structural/deterministic.

## 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"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "iban"
     ],
     "properties": {
      "iban": {
       "type": "string",
       "description": "IBAN incl. country prefix"
      }
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "additionalProperties": true
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/chainverdict-iban-validator-3ddd93d2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from chainverdict.xyz](https://www.zero.xyz/host/chainverdict.xyz/llms.txt)