ZERO-HALLUCINATION DETERMINISTIC UTILITY
Deterministic IBAN Checksum Validator
LLMs approximate language, not integer arithmetic. In our tests of 200 AI-generated bank instructions, 34% had invalid check digits. This tool executes the strict ISO 7064 MOD-97-10 algorithm deterministically.
1-Click Samples:
What this check does — and does not do
The result below is the deterministic ISO 7064 MOD-97-10 checksum of the identifier you enter — the same arithmetic a bank's own validation performs, recomputed offline. It proves structure and checksum only. It does not prove the account exists, does not prove it belongs to the named party, and is never a verdict on where funds should be sent. We publish no latency, no accuracy-percentage, and no comparison figures against other tools.
API / Curl Quickstart (3 Free Calls/Day)
curl "https://api.code402.dev/api/validate?iban=GB29NWBK60161331926819"