Three-letter ISO 4217 currency code representing the transaction currency. Must be exactly 3 uppercase alphabetic characters (e.g., `USD` for US Dollar, `EUR` for Euro, `INR` for Indian Ruppee).
Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.
Get an API key
Free tier, no form to fill in. Signing in shares your email address with us — we
store it to create your key and to recognise you if you sign in with another
provider. See our Privacy Policy and
Terms.