ECB Euro Exchange Rates

Independent tool. Not an official service and not endorsed by the European Central Bank. Daily euro foreign exchange reference rates published by the ECB (about 40 currencies, history since 1999), returned as clean JSON.

Data source: European Central Bank, euro foreign exchange reference rates (ECB Data Portal, data-api.ecb.europa.eu). The ECB allows reuse of its statistics provided the source is acknowledged. The actor only filters and structures the data; it does not change any rate. The ECB indicates that reference rates are for information purposes only and are not intended for transaction purposes.

Invoice converter (batch)

Send a list of lines and get each amount converted with the ECB reference rate of that date, or, when nothing was published that day (weekends, TARGET holidays), the last rate published before it. Every result says which rate date was used, so you can show it in your books.

Input (conversions):

[{"date":"2026-10-11","from":"USD","to":"EUR","amount":1200},
 {"date":"2025-12-27","from":"GBP","to":"USD","amount":100}]

Output (real run):

{"type":"conversion","date":"2026-10-11","from":"USD","to":"EUR","amount":1200,"base":"EUR","rate":0.89237908,"rateDate":"2026-10-09","daysBack":2,"usedEarlierRate":true,"convertedAmount":1070.85}
{"type":"conversion","date":"2025-12-27","from":"GBP","to":"USD","amount":100,"base":"EUR","rate":1.3503265,"rateDate":"2025-12-24","daysBack":3,"usedEarlierRate":true,"convertedAmount":135.03}

• Any pair works: rates go through the euro (rate = units of to per 1 from); EUR can be either side.
• One request to the ECB serves the whole batch (up to 10,000 lines).
• A line with no published rate on or before its date (before 1999 or before a currency started) comes back with error: "no_rate_published_on_or_before_date" and is not billed.
• Billing: one rate event per converted line. Informational only: check with your accountant which rate and date your jurisdiction requires.

Input

Field	Meaning	Default
currencies	3-letter codes (USD, GBP, JPY...); empty = all	USD, GBP
startDate, endDate	Range in YYYY-MM-DD	none
conversions	Batch of {date, from, to, amount} lines (see above); when present, the fields below are ignored	none
latestOnly	Only the latest rate per currency	false
maxItems	1-100,000 rates, newest first	100

Output (one record per currency and day)

{"date":"2026-10-09","currency":"JPY","currencyName":"Japanese yen","base":"EUR","rate":177.34,"inverseRate":0.00563889,"source":"European Central Bank, ECB euro foreign exchange reference rates","fetchedAt":"2026-10-10T18:47:22.868Z"}

rate = units of the currency per 1 EUR. inverseRate = EUR per 1 unit (calculated).

Pricing (pay per event)

• Run start: $0.005
• Rate: $0.0005 (one year of one currency, about 250 days = $0.125)

Limits

• Rates are published on TARGET working days around 16:00 CET; weekends and holidays have no value.
• Reference rates against the euro only; other pairs must be computed by you.
• Not for trading or settlement.

Data protection

Only public macro-financial data. No personal data.