{"usage":"GET /v1/iban?value=AT61XXXXXXXXXXXXXXXX","required":{"value":"IBAN in any spacing, checked with mod-97"},"auth":"header X-API-Key (get one free at /kaufen, 100 calls included)","returns":["valid","country","bank_code","bank_name","formatted"],"example":"https://api.eucompliance.tools/v1/iban?value=AT151420020014409310","free_alternative":"no key needed: /free/... endpoints, 5 calls a day","catalog":"https://api.eucompliance.tools/.well-known/x402"}