CurrencyArchiveAPI is a free, open-source .NET 8 API with 25+ years of historical rates for 160+ currencies. All data loads in memory (~25 MB) for instant conversions, and each day’s rates are also available as JSON with source code. Features include analytics, base currency switching, and historical queries. You can self-host with the latest container images. It requires no database, ideal for developers, analysts, ML engineers, and students.
CurrencyArchiveAPI — Free & Open Source.Free Currency API with 25 years of data for 160+ currencies.Dec 2025