Use cases

Exchange rates for accounting & invoicing

Stamp invoices and expenses with the correct rate on the correct date — auditable and consistent.

Example

An invoice issued on a past date must record the exchange rate as it was that day. You fetch the historical rate for the invoice date and store it alongside the line items.

# Rate on the invoice date
curl "https://rate-api.com/api/v1/YOUR_KEY/historical?date=2026-03-01&base=EUR&symbols=USD"

Why Rate-API

• Date-accurate rates via /historical for compliance (Pro+).
• Consistent USD-pivoted cross-rates for any currency pair.
• Deterministic JSON that’s easy to archive.