There are 2 repositories under historical-rates topic.
This is a self hosted, free, open source Python Currency Exchange Rate API fork.
A command line program where you can get currency in different formats from any service provider
A forex exchange rates and historical data, also you can get live price feeds with socket or JSON API.
A preprocessor to construct medical history table from data source
ExchangeRates is an API for current and old foreign exchange rates published by the European Central Bank. The API is built on ASP.NET Core (v3.1) with Razor pages and controllers. Hosted for limited time at Azure.
Javascript client for exchangeratesapi.io