Based on our record, Alpaca Data API should be more popular than CurrencyStack. It has been mentiond 8 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Currencystack.io — Production-ready real-time exchange rates for 154 currencies. - Source: dev.to / almost 3 years ago
Have you looked at Alpaca's Market Data API or Polygon.io. Both premium options are reasonably priced and give you access to both historical and real time trades. Source: over 1 year ago
I think https://alpaca.markets/data still offers free api keys for research purposes. Source: over 1 year ago
Https://alpaca.markets/data - As you see you get 100% market coverage for all US exchanges and unlimited API / WebSocket access. They also have 1min bar historical data (I do not know about the tick level). I can not speak to the quality of the API Access as I have a TotalView subscription. Source: almost 2 years ago
Free tier for researchers, now $99/month for the algotrading access (link: https://alpaca.markets/data). Source: almost 2 years ago
Https://alpaca.markets/data free plan has 200 calls/minute limit which is what you want anyway. Source: about 2 years ago
Stacks - A bookshelf for your online courses
Bullish.email - The Stock Market in your inbox every morning
The Brex API - Brex credit cards and business accounts help startups scale fast, and Brex’s API can make you even faster.
Setu - Setu’s APIs and software is used by hundreds of businesses from startups to large enterprises to reimagine onboarding, payments, deposits, lending and data empowerment for their end customers.We’re hiring across the board!
Robinhood - Free stock trading service.
Lendflow API - The Lendflow API allows you to embed lending services into your product so you can increase engagement, improve retention and expand revenue per user.