# IBAN GL Validator (Greenland)

> IBAN GL Validator (Greenland) is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.006/call, status unknown (last checked 2026-10-02).

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

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/check-iban-gl?utm_source=zero.xyz
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/iban-gl-validator-greenland-8b547344
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HRbx2t_TKsVUX1bMkHRZn

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-gl-validator-greenland-8b547344 -d '<json body>'
```

Example prompt: Can you check whether 'GL8964710001234564' is a valid Greenlandic IBAN — specifically that it passes mod-97 and is exactly 18 characters long?

## When to prefer this

Use this endpoint when you specifically need to validate a Greenlandic (GL) IBAN and require mod-97 checksum verification along with the 18-character length constraint. If a free sandbox endpoint (/v1/sandbox/check-iban-gl) is available, prefer that to avoid the $0.006 USDC cost. Choose country-specific IBAN validators (like this GL one) over generic IBAN validators when you need precise country-code and length enforcement for Greenland.

## Known failure modes

- Input string is empty or exceeds 20000 characters — request rejected
- IBAN has correct GL prefix but wrong length — returns invalid
- Mod-97 checksum fails — returns invalid with failure reason
- Non-GL IBAN submitted — may return invalid due to wrong country code
- Network or payment authorization failure — HTTP 402 or 5xx error

## How this service works

Call when an agent needs whether an IBAN is a mod-97-valid GL number of length 18. Exact $0.006 USDC. Prefer unpaid POST /v1/sandbox/check-iban-gl first.

## Output

A boolean or structured result indicating whether the submitted string is a valid Greenlandic (GL) IBAN: correct country code prefix 'GL', exactly 18 characters in length, and passing the mod-97 checksum algorithm.

## 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": [
    "GL20AAAA0000000000"
   ],
   "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/iban-gl-validator-greenland-8b547344/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)