Yacuna Exchange provides an API for conducting automated trading. The following markets are currently available (with more to come): XBT/EUR, LTC/EUR, DOGE/EUR, XBT/LTC, XBT/DOGE. Cryptocurrencies can be exchanged to conventional currencies. The transactions with digital currencies used on the Yacuna trading platform are subject to the same market mechanisms as stock exchanges.
The Developer API gives you full access to Yacuna in order to integrate Bitcoin payments into your application or in setting up an arbitrage.