# ISIN Validator (ISO 6166)

> ISIN Validator (ISO 6166) is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-16).

Validates a securities ISIN code: checks format, ISO 6166 check digit, issuing country, and embedded CUSIP (US/CA) or SEDOL (GB/IE) — computed locally with no data stored.

## Facts

- Endpoint: POST https://api.vextorium.com/validar-isin-pago?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/isin-validator-iso-6166-e2b1ee1a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2cT9elzOnnD8fzsCWJq7l

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 isin-validator-iso-6166-e2b1ee1a -d '<json body>'
```

Example prompt: Can you check whether US0378331005 is a valid ISIN — I need to know if the format, check digit, and embedded CUSIP all pass?

## When to prefer this

Use this endpoint when you need fast, local (no external data stored), standards-compliant ISIN validation including ISO 6166 check digit verification, country identification, and embedded CUSIP (US/CA) or SEDOL (GB/IE) sub-identifier checks — all in a single call at very low cost. Prefer it over a general financial data API when you only need structural validation, not pricing or market data.

## Known failure modes

- Malformed ISIN (wrong length, non-alphanumeric characters) returns valido: false with null sub-fields
- Unknown or unrecognized country prefix may result in null pais and null cusip/nsin fields
- Check digit mismatch returns valido: false
- Missing required 'isin' field in request body returns a validation error
- Network timeout on the micro-API endpoint

## How this service works

Validate a securities ISIN (ISO 6166): format, check digit, issuing country and embedded CUSIP (US/CA, with its own check) or SEDOL (GB/IE). Computed locally; nothing stored.

## Output

A JSON object containing: the normalized ISIN string, a boolean validity flag, the NSIN (national securities identifier portion), the issuing country name and ISO code, the extracted CUSIP (for US/CA) or SEDOL (for GB/IE), a boolean indicating whether that embedded identifier's own check digit is valid, and the ISIN check digit character.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "isin": {
   "type": "string",
   "description": "ISIN code, e.g. US0378331005 or ES0113900J37"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "isin": "US0378331005",
  "nsin": "037833100",
  "pais": "United States",
  "cusip": "037833100",
  "valido": true,
  "pais_codigo": "US",
  "cusip_valido": true,
  "digito_control": "5"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/isin-validator-iso-6166-e2b1ee1a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.vextorium.com](https://www.zero.xyz/host/api.vextorium.com/llms.txt)