PolySwarm is a threat detection marketplace where antivirus companies and enterprises dramatically expand and improve their protection coverage against new threats. The PolySwarm ecosystem incentivizes what matters most: quality output of malintent detection. It rewards honest market participation through collection and distribution of fees to value-adding, active security experts. PolySwarm is a decentralized threat intelligence marketplace. The PolySwarm marketplace objective is to crowd-source security experts and have their macro or micro-engines compete, in their areas of expertise, to provide better coverage of the malware landscape, fewer false positives/negatives and more up-to-date detection. The marketplace is a prediction market design. This is an open source project with no middleman, PolySwarm does not take a fee from the marketplace. Crowdsourcing truth by market design and Ethereum smart contracts.