eBay's Developer program said DataUnison has released a free version of its Research Web Services for eBay, an API that provides 30 days of eBay historic sales data. DataUnison is a licensed eBay Market Data reseller and sister-company to Terapeak, a provider of eBay market data. The DataUnison API is free for non-commercial use (up to 1,000 calls a month), meaning third-party developers can use it in their widgets and affiliate tools. "Access to eBay Research APIs is over HTTP, and requires only an eBay AppID for authentication."

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