plentyMarkets is a self-described "all-in-one eBusiness solution" operating out of Germany. plentyMarkets operates through the web portal of its parent company, plentySystems. The services provided by plentyMarkets focuses on helping users expand their web presence and run online businesses by providing services to aid in logistics, payments, statistics, and market exposure.
The plentyMarkets API allows programmatic access to a variety of functions provided by plentyMarkets' web-based software, including customer, item, and order management. This is a SOAP based API that returns data in XML, and requires an account with service for access.
Please note that, while plentyMarkets provides extensive API documentation in English, the majority of their site is in German.