IBAN Validation
Validates an IBAN from any of 70+ countries: checksum, country length and in-country account structure, and resolves the bank and branch codes.
POST /v1/iban/validate · 1 credit · deterministic
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/v1/iban/validate
{
"iban": "DE89 3704 0044 0532 0130 00"
}Press Run to try free — no key needed.Why this exists
Built for hostile input
A Turkish address arrives as "Cd." or "Cad." or "Caddesi", with the flat number glued to the building number. Generic parsers drop half of it silently. This one tells you what it could not place.
Every number carries its provenance
Each archived point stores the source URL and a content hash of the page it came from, and the archive is committed to a Merkle root anchored in Bitcoin. Every commitment — with its cutoff, leaf count and anchors — is published at /proof, so you can check for yourself how current the latest one is. The bulletins themselves are public and anyone can read them; what this adds is that a number you quote can be shown to be the number we held on that date, and that it has not been edited since.
You only pay for work
Repeated inputs come from cache and cost zero credits. If a response ever fails its own schema, the call is refunded automatically.
Endpointsexpand any row to see the parameters and call it live
Validation1
/v1/iban/validate
IBAN Validation
deterministic
1 credit
Validates an IBAN from any of 70+ countries: checksum, country length and in-country account structure, and resolves the bank and branch codes.
Most free libraries stop at the mod-97 checksum. That only says the digits are self-consistent — not that the number could exist in that country. This checks the country's BBAN structure too, so a wrong-length or wrong-shaped account is rejected before your payment file reaches the bank. When only the two check digits are wrong, the correct ones are computed and returned as a suggestion, because that is what people actually mistype. Turkish, Dutch and Belgian IBANs additionally resolve to a bank name when the national code is in our table; otherwise bankName is null. This is not a SWIFT directory.
Parameters
| iban* | string | IBAN, with or without spaces. |
| expectCountry | string | Expected country code (ISO 3166-1 alpha-2). |
/v1/iban/validate
{
"iban": "DE89 3704 0044 0532 0130 00"
}Press Run to try free — no key needed.Pricingone key covers every endpoint
Free try on this page → when you need a key, Proceed to pay · API access.
Credits are consumed per call and cache hits are free. Requests without a key run on a narrow per-IP demo quota so you can evaluate before signing up.
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Use it from an AI assistantthe same catalogue, exposed as MCP tools
Every endpoint is also published over the Model Context Protocol, so Claude, ChatGPT or your own agent can call it directly — no glue code, no wrapper functions. The assistant sees the same input schemas and the same metering.
Currently 68 tools. New endpoints appear automatically; nothing to update on your side.
claude_desktop_config.json
{
"mcpServers": {
"temsor": {
"url": "https://api.temsor.com/mcp",
"headers": { "x-api-key": "fk_live_…" }
}
}
}
Quickstart
Official client: npm install temsor-api · npmjs.com/package/temsor-api
Node.js
import Client from "temsor-api";
const api = new Client({ apiKey: KEY });
const r = await api.${(() => {
const first = apis[0];
return first.slug.split(/[/-]/).map((p, i) => (i === 0 ? p : p[0].toUpperCase() + p.slice(1))).join('');
})()}(${esc(JSON.stringify(apis[0].examples[0]?.input ?? {}))});
console.log(r, r.$meta);cURL
curl -s https://api.temsor.com/v1/iban/validate \
-H "content-type: application/json" \
-H "x-api-key: fk_live_…" \
-d '{"iban":"DE89 3704 0044 0532 0130 00"}'JavaScript
const res = await fetch("https://api.temsor.com/v1/iban/validate", {
method: "POST",
headers: { "content-type": "application/json", "x-api-key": KEY },
body: JSON.stringify({"iban":"DE89 3704 0044 0532 0130 00"})
});
const { data } = await res.json();Python
import httpx
r = httpx.post("https://api.temsor.com/v1/iban/validate",
headers={"x-api-key": KEY},
json={"iban":"DE89 3704 0044 0532 0130 00"})
data = r.json()["data"]