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Checksum Validator (IBAN, Luhn, EAN-13, ISBN, UUID, ULID)
x402
Checksum Validator (IBAN, Luhn, EAN-13, ISBN, UUID, ULID) is a paid API for AI agents from toolbelt402.tpoborne.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).
Validates identifiers by checksum algorithm — IBAN (mod-97), payment card numbers (Luhn), EAN-13 barcodes, ISBN-10/13, UUIDs (RFC-4122), and ULIDs — in batches up to 100 per call with per-item pass/fail reasons.
Price / call$0.002
Success—
StatusUnknown
How this service works
Validate identifiers by checksum: IBAN (mod-97), card numbers (Luhn), EAN-13, ISBN-10/13, UUID (RFC-4122), ULID. Batch up to 100 per call with per-item reasons.
Output
Returns a per-item array (up to 100) where each entry includes the original identifier, a boolean valid flag, the detected identifier type (IBAN, Luhn, EAN-13, ISBN-10, ISBN-13, UUID, ULID), and a human-readable reason string explaining the checksum result or the specific failure cause.
Example use cases
E-commerce card number pre-validation
“Before I send these 50 card numbers to the payment processor, can you run a Luhn check on all of them and tell me which ones are already invalid so I can filter them out?”
Book catalog ISBN audit
“I have a list of ISBNs from our catalog import — some are ISBN-10 and some are ISBN-13. Can you validate all of them and tell me which ones have bad checksums so I can flag them for manual review?”
User-submitted IBAN verification
“A user just entered the IBAN NL91ABNA0417164300 in our payment form — can you check if it passes the mod-97 checksum before we attempt the bank transfer?”
Technical details
Endpoint
POSThttps://toolbelt402.tpoborne.workers.dev/validate/checksumWhen to prefer
Choose this endpoint when you need algorithmic checksum validation of well-known identifier formats (IBAN, card numbers, EAN-13, ISBN, UUID, ULID) without hitting a financial institution or external database. It is ideal for pre-validation pipelines (catching bad identifiers before expensive downstream calls), bulk data-quality audits, and form validation where you need a human-readable reason for each failure. It does not perform live bank account lookups or card authorization — use it purely for format/checksum correctness.
Side effects
- Batch exceeds 100 items — request is rejected with an error
- Unrecognized identifier type — item marked invalid with 'unknown format' reason
- Malformed input (non-string, null) — per-item error or overall 400 response
- Ambiguous identifier that could match multiple types — may be checked against most likely type only
- Network timeout on Cloudflare Workers edge — transient 5xx
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| items | array |
Tags
x402
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