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ISIN Check Digit Validator
x402
ISIN Check Digit Validator is a paid API for AI agents from id-validators.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-30).
Validates the check digit of a securities ISIN and splits it into its country code and national security identifier number (NSIN).
Price / call$0.02
Success—
StatusUnknown
How this service works
Validate a securities ISIN check digit and split it into country code and national security number.
Output
Returns a verdict (valid/invalid), normalised ISIN string, country code, NSIN, CUSIP if the issuer is US-based, a summary of the validation outcome, an array of reasons if invalid, an asOf timestamp, and a disclaimer. The 'degraded' flag indicates if the check ran with reduced confidence.
Example use cases
Validate ISIN before trade submission
“Before I submit this order, check that the ISIN GB0002634946 is valid — verify the check digit and confirm the country code.”
Extract CUSIP from US ISIN
“I have the ISIN US5949181045 — can you validate it and pull out the underlying CUSIP from it?”
Bulk data quality check on securities list
“I've got this ISIN DE0005140008 from our database — run a check digit validation on it and tell me if there are any problems with the format.”
Technical details
Endpoint
GEThttps://id-validators.x402tookit.com/isin-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to validate a specific ISIN's check digit and decompose it into its constituent parts (country code, NSIN, CUSIP for US securities). Prefer this over a generic format regex check when you need authoritative check-digit validation per the ISO 6166 algorithm.
Side effects
- Missing or empty 'id' query parameter returns an error
- Malformed ISIN (wrong length or non-alphanumeric characters) returns invalid verdict with reasons
- Network timeout or upstream service unavailability
- Payment failure via x402 protocol results in 402 response before processing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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