API management
Usage has two parts, Key verifications and standalone rate limit operations, metered against your monthly operations quota. Only successful calls count: invalid, expired, or over-limit requests aren’t billed. These two are the billable operations that Limits caps and that a paid API tier prices.
Compute
Compute usage totals cost for the period, broken down by project, then , then . Each level shows four quantities and a cost.
If a project uses gateway key auth, it also carries Verified keys: those verifications bill to the project, not a keyspace.
Usage is what you consumed. Limits are the ceilings. Costs here are the metered part of the bill. The plan fee and included credit are on Plans.