Payment APIs for altcoins

[tyz]

I've recently integrated bitcoin payment service to my online shop using the blockchain.info API. Since my users welcome this new option very well I decided to accept payments in some altcoins, too. I think payment options in Litecoins, Feathercoins and Dogecoins would be a benefit for my users. I did some research but was not able to find APIs for those altcoins. Are there such APIs out there or do I need to engage an developer to design them?