# IBAN BY Mod-97 Validator

> IBAN BY Mod-97 Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.009/call, status unknown (last checked 2026-10-23).

Validates whether a given string is a mod-97-valid Belarusian IBAN (BY) of the required 28-character length

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/check-iban-by?utm_source=zero.xyz
- Price: $0.009/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/iban-by-mod-97-validator-2d645b66
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yCdzcMaWSsa9LJfoqRPU-

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-by-mod-97-validator-2d645b66 -d '<json body>'
```

Example prompt: Can you check whether this IBAN is a valid Belarusian BY account number that passes the mod-97 check: BY13NBRB3600900000002Z00AB00?

## When to prefer this

Use this endpoint when you specifically need to validate a Belarusian BY IBAN (28 characters) using the standard mod-97 algorithm and need a deterministic, non-LLM result. Prefer the free sandbox endpoint /v1/sandbox/check-iban-by for testing before paying. Choose this over general-purpose IBAN validators if you require a paid, auditable, production-grade validation call for BY-country accounts specifically.

## Known failure modes

- Input string missing or empty — returns error
- Value exceeds 20000 character maximum or is under 1 character
- Non-BY IBAN country code submitted — may return invalid or unsupported
- Malformed JSON body — returns 400-level error
- Payment of $0.009 USDC not attached — returns 402 Payment Required
- Network timeout on the endpoint

## How this service works

Call when an agent needs whether an IBAN is a mod-97-valid BY number of length 28. Exact $0.009 USDC. Prefer unpaid POST /v1/sandbox/check-iban-by first.

## Output

Returns a validation result indicating whether the supplied string is a structurally correct, mod-97-valid Belarusian IBAN (BY) of 28 characters — typically a boolean pass/fail along with any relevant details about the check

## 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": [
    "BY10AAAA00000000000000000000"
   ],
   "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-by-mod-97-validator-2d645b66/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)