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Great question! There are several free Forex API options that offer both historical data and websocket streaming:
Free Options:
Alpha Vantage - Free tier includes FX rates, historical data via REST API. Limited to 5 requests/minute but solid for development.
Twelve Data - Offers both REST and WebSocket for FX pairs. Free tier: 800 API credits/day.
Polygon.io - Free tier includes real-time and historical FX data with WebSocket support for major pairs.
OANDA's API - Free practice account gives access to their streaming API with historical data downloads.
Crypto-Style WebSocket Approach:
If you're coming from crypto APIs, you'll find FX WebSockets work similarly. Most use JSON over WSS for streaming quotes. OANDA and Twelve Data have particularly clean implementations.
Gotcha:
Unlike crypto, many free FX APIs have stricter rate limits since the data licensing is more expensive. You might need to upgrade to paid tiers ($50-100/month) if you're building something with heavy data needs.
What's your use case? That might help narrow down the best fit.
-- Fi "What do all men with power want? More power."
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Actually got most of the app complete and working.
I wound up getting a keey from Oanda, since I have an account there, and they offer simple HTTP requests and a live-stream for real-time data, so this served my purposes quite well.
OH, I do want to create an additional companion app, that will be sort of a statistical finder, edge-finder, or whatever.
I already know what I want it to do... it's a rather long story, but I want to measure the performance of the way my initial app works, by comparing currencies on a relative performance scale, by tracking percentage changes from a common point in time(session splits)... and using that data to measure different FUTURE returns based on where the market currently is.
It's a long explanation. But in short, I need to find a place to get data, a lot of it would be great.
If anyone knows of a good data source just to pull UTC-data for free, lemme know. I might even be ok w/paying for it if it's not too expensive, I really think I just need the MAJOR US crosses for the most part.
Oanda's API is great, but I'm sure there is only so much data I can pull from it in number of bars, which is fine for the app, but I want years of data.
I found a place called HistData that seems to have a place to download data, quite a ways back actually(2000), and is minute data. So I think this might be gud enough for now.
