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Irish PPSN Validator (Offline)
x402
Irish PPSN Validator (Offline) is a paid API for AI agents from toll402.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Validates an Irish Personal Public Service Number (PPSN) by checking its format and verifying the check letter using the official mod-23 weighted-sum algorithm, entirely offline.
Price / call$0.001
Success—
StatusUnknown
How this service works
Offline validator for an Irish PPSN (Personal Public Service Number): checks the 7-digit + 1 check-letter (+ optional trailing 'A' or 'H' modifier letter) format and verifies the check letter using the published mod-23 weighted-sum algorithm (weights 8..2, optional modifier adds 9 or 72). Processes a single PPSN only; no network access or storage.
Output
Returns a validation result indicating whether the submitted PPSN string passes both the format check (7 digits followed by a check letter and optional 'A' or 'H' modifier) and the mod-23 weighted-sum check-letter algorithm. Likely includes a boolean valid/invalid status and possibly a reason or error detail on failure.
Example use cases
KYC form pre-submission check
“Before we submit this user's Irish government form, can you validate that their PPSN '8765432FA' is correctly formatted and has the right check letter?”
User registration PPSN verification
“A new user signed up with the PPSN '1234567TW' — can you check if that's a valid Irish PPSN so we don't let bad data into our system?”
Bulk data cleaning spot-check
“I have a PPSN from our legacy database: '9876543RH' — can you verify if it passes the Irish mod-23 check-letter algorithm?”
Technical details
Endpoint
POSThttps://toll402.dev/v1/t/ppsn_ie_validateWhen to prefer
Choose this endpoint when you need a fast, offline, deterministic validation of an Irish PPSN with no external data dependencies. It is ideal for pre-submission checks, user registration flows, or data-quality pipelines where you only need format and check-letter correctness — not identity lookup or cross-referencing against a government database.
Side effects
- PPSN with incorrect number of digits rejected as format error
- Invalid check letter (mod-23 mismatch) returns validation failure
- Unsupported trailing modifier letter (anything other than A or H) rejected
- Empty or missing ppsn field returns a schema validation error
- Non-string input types may cause a 400-level error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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