Last week's launch of Google Drive, a cloud-based platform offering 5GB of free storage, may have been big news, but perhaps bigger was the simultaneous launch of an associated Drive API and several Drive-enabled apps in the Chrome Web Store. The move implies that Drive is not just another Google product, but a step toward creating a larger ecosystem of online apps backed by Google services.
Deciding what metrics matter depends on the overall strategy goals and business model that aligns with your APIs. This is why defining the business model was one of the first steps in your decision series. Now we need to make sure our evaluation framework matches back up to what we set out to do.