Argent - Crypto's first one tap app to earn & invest
Coinwink - Crypto alerts, watchlist and portfolio tracking app for Bitcoin, Ethereum, and other 3500+ crypto coins and tokens
Robinhood - Free stock trading service.
CoinMarketCal - All crypto events that help crypto traders at one place
Alpaca Fractional Trading API - Commission-free API to trade & invest for as little as $1
Cryptorch API - Cryptorch API is an AI-powered machine learning utility that is used in forecasting the prices for various cryptocurrencies from Bitcoin to BitTorrent.