# NL IBAN Mod-97 Validator

> NL IBAN Mod-97 Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-02).

Validates whether a given string is a mod-97-valid Dutch (NL) IBAN of exactly 18 characters

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/check-iban-nl?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nl-iban-mod-97-validator-87496db3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_X2k30KrOu-zVcnSgPPteW

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 nl-iban-mod-97-validator-87496db3 -d '<json body>'
```

Example prompt: Can you check if NL91ABNA0417164300 is a valid Dutch IBAN number — I need to make sure it passes the mod-97 checksum and is the right 18-character NL format before I send a payment.

## When to prefer this

Use this endpoint when you specifically need to validate a Dutch (NL) IBAN that must be exactly 18 characters and pass mod-97. Prefer the free sandbox endpoint POST /v1/sandbox/check-iban-nl first to avoid charges during testing. Choose this paid endpoint for production validation where reliability guarantees matter. For IBANs from other countries (PT, SE, ME, QA, SC, SI), use the corresponding country-specific sibling endpoint.

## Known failure modes

- IBAN too short or too long (not 18 characters) — validation returns false
- Country code is not NL — returns invalid even if mod-97 passes
- Malformed input or non-alphanumeric characters — returns error or invalid
- Network timeout or payment failure (x402) — request not processed
- Empty or missing value field — returns 400 or validation error

## How this service works

Call when an agent needs whether an IBAN is a mod-97-valid NL number of length 18. Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/check-iban-nl first.

## Output

A boolean or structured result indicating whether the provided string is a valid Dutch (NL) IBAN: 18 characters long and passing the ISO 7064 mod-97 checksum. May include details on which check failed if invalid.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "data": {
   "description": "JSON value for schema-check SKUs. Omit it on string checks such as email or IBAN."
  },
  "value": {
   "type": "string",
   "examples": [
    "NL54AAAA0000000000"
   ],
   "maxLength": 20000,
   "minLength": 1,
   "description": "Value to check. The route description names the format: email, phone, IBAN, postal code, VAT, national id, or similar."
  },
  "schema": {
   "description": "JSON Schema document for schema-check SKUs. Omit it on string checks."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nl-iban-mod-97-validator-87496db3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentshelf.syntexa.ch](https://www.zero.xyz/host/agentshelf.syntexa.ch/llms.txt)