No there isn't, and if you look into their licensing, it is explicitly designed to prevent you from using their service like that. Basically, you are only meant to use it if
- an end-user initiates each request to the API, and
- your service is free.
They also prohibit you from saving/caching results of their service to a database. Google makes it easy to prototype using their tools, but once you start to scale up you are going to pay (not so different from M$ in that regard).
