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2s.io ISIN Validator
x402
2s.io ISIN Validator is a paid API for AI agents from 2s.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Validates a 12-character ISIN (ISO 6166) by checking structure, country prefix, NSIN format, Luhn check digit, and optionally extracts embedded CUSIP for US/CA securities.
Price / call$0.001
Success—
StatusUnknown
How this service works
Validate an ISIN (International Securities Identification Number, ISO 6166): 2-letter country prefix + 9-char NSIN + Luhn check digit. Returns {valid, isin, country, nsin, embeddedCusip (for US/CA), checkDigit, reason}. Catches transposed characters in security master data that a regex misses. Structure + checksum only.
Output
Returns a JSON object with: valid (boolean), isin (normalized string), country (2-letter ISO code), nsin (9-character national security identifier), embeddedCusip (extracted CUSIP for US/CA ISINs), checkDigit, and reason (human-readable explanation if invalid, e.g. bad checksum or transposed characters).
Example use cases
Example prompt
“Can you check whether US0378331005 is a valid ISIN — I want to know if the structure and checksum are correct and what the embedded CUSIP is?”
Technical details
Endpoint
GEThttps://2s.io/api/validate/isinWhen to prefer
Use this endpoint when you need to validate ISINs beyond a simple regex — specifically when you need to catch transposed-digit errors in security master data, extract embedded CUSIP identifiers from US or Canadian ISINs, or confirm ISO 6166 Luhn checksum compliance. Prefer this over a regex check whenever data quality or compliance accuracy matters.
Side effects
- ISIN not exactly 12 characters — returns valid:false with reason explaining length mismatch
- Invalid country prefix (not a recognized ISO 3166 alpha-2 code) — returns valid:false
- Luhn check digit mismatch — returns valid:false with reason indicating checksum failure
- Non-alphanumeric characters in NSIN segment — returns valid:false
- Missing or empty isin query parameter — likely returns 400 or error response
- Case-insensitive input accepted but malformed strings still rejected
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"isin": "US0378331005"
}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
{
"data": {
"ok": true,
"items": [
{
"isin": "US0378331005",
"nsin": "037833100",
"input": "US0378331005",
"valid": true,
"reason": null,
"country": "US",
"checkDigit": "5",
"embeddedCusip": "037833100"
}
],
"total": 1,
"source": {
"url": "https://2s.io",
"license": "No upstream license — computed by 2s.io",
"provider": "2s.io ISIN validator"
}
},
"meta": {
"cost": {
"usd": 0.001,
"tier": 0
},
"caller": "x402",
"version": null,
"endpoint": "validate.isin",
"settlement": {
"txHash": "0x097ea205090ab2b461d31b34e4cd6ef338859c61035e2a07209a120839aa77ce",
"network": "eip155:8453",
"success": true
}
}
}Tags
x402
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