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Data Marketplace helps people find, buy and sell data online. It helps users seeking a specific data to creating a request for free, explain their needs, add an optional deadline and budget, and in turn allows aggregators respond with relevant data for purchase. All of the data on Data Marketplace is available for immediate purchase and download. They provide data in standard formats (e.g. Excel, CSV, XML, JSON) . Data Marketplace is funded by Y Combinator.

Priceonomics is the price guide for everything. Price guides are helpful for buying and selling used things. How much should I spend on this used bicycle on Craigslist? How much should I sell my stereo system for on eBay? Is this used Vespa a good deal, or what?