API to send bitcoins from paper/cold wallet? I am making a program which will take a .wif private key, and send all funds from the wallet represented by the key to a certain address. I need this to be fully automated, but I can't seem to find any simple API which can send from a .wif. Thanks!
You can just do it yourself instead of having to send a 3rd party your private keys. Here's one that I wrote using nodejs and bitcore-lib that takes a WIF and sends all funds to a different address. 

https://github.com/coinables/sweepkey/blob/master/app.js