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Coinbase Earn - Earn crypto while you learn crypto
Imakiku - Imakiku is an audience response system for real-time voting, posting comments, and surveying.
Coinseed Crypto Cash Back - Earn crypto while shopping on Amazon
Blooket - Blooket is an interesting application that provides you with a wide range of features to create activities for class engagement.
Twitter Polls - Polls embedded in tweets