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Auction software is application software, that can either be deployed on a desktop, on a web server or as a smart contract on a blockchain virtual machine. This software is used by auctioneers and participants of online auctions such as eBay. Smart contracts replace an auctioneer's server, if the auctioneer is not trusted.
Online Auction companies have opened up their applications to third party application developers to extend the capabilities and increase revenue. API interfaces were developed using XML which enable third party developers to build applications that use the back-end of the online auction.