Interest rates on checking accounts at many brokerages range from 0.05% to 0.10%, the same as at many stand-alone banks, according to researcher DepositAccounts.com.
These jobs often involve local knowledge and range from things like checking what street signs say in rural Sudan for a satellite-navigation service to translating words into a Kenyan dialect for companies trying to spread their marketing.
For those who really want to keep track of their socks, the app also produces a range of data - checking how black they are, offering to replace worn-out socks and even finding a close match for socks whose partners have gone astray.