Currency Converter API

Currency Converter API: the same rates, in one call

The rate above comes from the AllRatesToday API. Each call below is one HTTP request that returns JSON for USD/EUR.

Live mid-market rate

The number shown on this page, refreshed every 60 seconds across 163 currencies. Use it for pricing, checkout and anything a customer sees.

curl "https://allratestoday.com/api/v1/rates?source=USD&target=EUR" \
  -H "Authorization: Bearer art_live_your_key"

Several targets in one call return one row per pair:

curl "https://allratestoday.com/api/v1/rates?source=USD&target=EUR,GBP,JPY" \
  -H "Authorization: Bearer art_live_your_key"

Official central bank rate

The rate a named institution published for a date, from 122 central banks and 4 tax authorities. It never changes after publication, which is what tax filings, customs and audits require.

curl "https://allratestoday.com/api/v1/central-bank/ecb/latest?source=USD&target=EUR" \
  -H "Authorization: Bearer art_live_your_key"

European Central Bank: live example responses · All 126 sources · Endpoint reference

• Historical (paid plans): ?time=YYYY-MM-DD for one past day, or /api/historical-rates for a range.
• Four formats: add ?format=csv, xml or xlsx to get a file instead of JSON.

Which one do you need? If a regulator, tax authority or auditor names the source, use the official rate — the two can differ by several percent on the same day. For everything a customer sees, use the mid-market rate. On weekends and holidays the official endpoints return the most recent published date, which is the figure compliance rules expect you to apply.