Crypto APIs is described as 'infrastructure layer that helps developers build enterprise-grade blockchain solutions faster. Crypto APIs provides a simple, single way to both fetch and push data from 10+ blockchains' and is an app in the bitcoin & cryptocurrency category. There are four alternatives to Crypto APIs for Online / Web-based and SaaS. The best alternative is Tardis.dev. It's not free, so if you're looking for a free alternative, you could try CryptoTradingAPI.io or CoinMarket Cap API.
Nomics' API is the best free cryptocurrency & bitcoin (market data) API available. It has no rate limits and is lightning fast, free & beloved by developers. The API is a lightning fast RESTful JSON API; it aspired to be crypto's data backbone.
CryptoTradingAPI.io is a Real-Time Crypto Prices & Technical Analysis JSON API. Get Live Crypto Prices and 31 Technical Indicators From Binance, CoinBase, and Kraken. Turbocharge Your Crypto App, Trading Bot, Oracle or Smart Contract.