Are there any API servers available for alt-coins that allow for transactions to be broadcast into their networks?
I have written a program in python that does exactly this for Litecoin, Bitcoin, and Dogecoin. The program can connect to peers on any of the above mentioned crypto network and submit the transaction directly instead of relying on a third party central server to push the transaction out to the network. 

It is available open source under https://github.com/kaykurokawa/pushtx