An alternative to the blockchain.info API is the Chain.com API. It's very easy to get up and running and the documentation is very robust, and there is support for various languages, or simple CURL requests.
OP is looking for payment forwarding. Chain.com API
DOES NOT offer this with their API. Also I have noticed chain's API is VERY unreliable especially their websocket API. Blockcypher offers payment forwarding if you are looking for an alternative.