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21 Lists - Send and receive targeted, paid microtasks
Amazon Mechanical Turk - The online market place for work.
Bitbounce - Charge unsolicited email senders a cryptocurrency fee
Universal Data Tool - Machine learning, data labeling tool, computer vision, annotate-images, classification, dataset
BitcoinGet - Earn bitcoin by completing tasks, answering surveys, watching videos, and more.
Labelbox - Build computer vision products for the real world