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ccxt
A JavaScript / TypeScript / Python / C# / PHP cryptocurrency trading API with support for more than 100 bitcoin/altcoin exchanges
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
You can also check https://github.com/ccxt/ccxt which is an open source api (python, js, php) for many crypto exchanges & https://github.com/aloysius-pgast/crypto-exchanges-gateway which is a self-hosted REST / WS api for a binance, okex, kucoin, bittrex & poloniex (disclaimer: i'm one of the developers of second project)
You can also check https://github.com/ccxt/ccxt which is an open source api (python, js, php) for many crypto exchanges & https://github.com/aloysius-pgast/crypto-exchanges-gateway which is a self-hosted REST / WS api for a binance, okex, kucoin, bittrex & poloniex (disclaimer: i'm one of the developers of second project)