Metering data (cpu cycles and bandwidth) can be accessed via the metering api.
Metering will require access-keys. You can generate by signing into Console and select the System menu and choose Service Access Keys.
Click Add new key and select Type Metering, a new key will be created..
The password will only be shown once, so store it in a safe location.
Keys are tied to a specific user, so each user have to use their own keys.
The specifics of the metering api can be found at the Meter service, use the key and password generated as above to authenticate to the service.