[Google Maps API v2] How are usage limits counted?

We are using Google Maps Javascript API V2, and I have a question
about the usage limits. We generate MANY map keys for use on
subdomains of the same top level domain. I am wondering if we are
going to hit the usage limits by using many different map keys for
many different subdomains of the same top level domain. Are the
transaction limits calculated per map key, per top level domain, or
another way?

I wasn't able to find this in the FAQ or ToS.

Thank you!

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