CheckfmtGet a free key

REST + MCP · one key for IBAN, BIC, VAT & VIN

Validate IBAN, BIC/SWIFT, VAT & VIN — one API

A fast, single developer API for the identifiers fintech and commerce apps check constantly. IBAN and BIC validate by checksum in pure compute; EU VAT relays the official VIES service and VIN decodes via NHTSA. Generous free tier, per-call pricing, MCP server, no SDK.

curl "https://www.checkfmt.com/api/v1/iban?iban=DE89370400440532013000&key=YOUR_KEY"
Get a free key →Try the IBAN validator →API & MCP docs →

IBAN

ISO 13616 mod-97 checksum + per-country length, across 40 countries. Pure compute.

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BIC / SWIFT

ISO 9362 format validation with bank / country / location / branch breakout.

Open →

EU VAT

Live validation via the official EU VIES service — returns the registered name when available.

Open →

VIN

Decode + validate a 17-char vehicle VIN via the US NHTSA vPIC database.

Open →

One tiny API

Four endpoints, one key, JSON in/out. IBAN & BIC are pure compute; VAT & VIN relay official sources.

MCP server

Validate identifiers from Claude, Cursor, or any agent with a metered key — no SDK.

Nothing stored

We validate format/checksums and relay official lookups. Submitted identifiers aren't retained.

Simple, per-call pricing

The IBAN & BIC validators on this site are free and need no account.

Free
$0
1,000 calls / mo
  • IBAN, BIC, VAT & VIN
  • MCP server
  • API key, no card
Starter
$8/mo
100,000 calls / mo
  • Everything in Free
  • Higher rate limits
  • Email support
Pro
$29/mo
1,000,000 calls / mo
  • Everything in Starter
  • Bulk validation
  • Priority support

Upgrade an existing key

Enter the email you used to get your key — your plan upgrade is applied to it automatically.

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Get a free API key

1,000 free calls a month, no card. Use it from REST or the MCP server.

See the API docs →