# ISIN Validator

> ISIN Validator is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-15).

Validates an ISIN code (ISO 6166) by checking format, check digit, issuing country, and embedded CUSIP (US/CA) or SEDOL (GB/IE) — computed locally with nothing stored.

## Facts

- Endpoint: POST https://api.vextorium.com/v1/isin-validate?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/isin-validator-b14a6fc4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_JfiqDLpGCg13SF4vM3GEV

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-b14a6fc4 -d '<json body>'
```

Example prompt: Is US0378331005 a valid ISIN? I need to know if the format and check digit are correct, and what country issued it.

## When to prefer this

Use this endpoint when you need fast, offline-style validation of ISIN codes without sending data to a third-party registry — ideal for compliance pipelines, data ingestion workflows, or pre-trade checks where latency and privacy matter. Prefer it over manual regex checks because it also validates the Luhn-based check digit and decodes the embedded CUSIP or SEDOL.

## Known failure modes

- Malformed ISIN (wrong length or non-alphanumeric characters) returns valid=false
- Incorrect check digit returns valid=false with the computed control digit
- Unknown or unsupported country prefix may return country as null
- Missing required 'isin' field in request body returns a validation error
- Non-US/CA ISINs will not include a CUSIP field or valid_cusip flag

## 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 original ISIN, validity boolean, country name and code, the embedded NSIN, CUSIP (for US/CA ISINs) with its own validity flag, and the control/check digit.

## 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",
  "cusip": "037833100",
  "valid": true,
  "country": "United States",
  "valid_cusip": true,
  "country_code": "US",
  "control_digit": "5"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/isin-validator-b14a6fc4/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)