GET /projects/{id}/usage?from=<instant>&to=<instant> on the console’s
address, signed in or with an OAuth token, answers the project’s total for
each meter over the window: from from, included, to to, excluded. Both are
required RFC 3339 instants, and from must be before to (else 422 unprocessable). Every meter is in the answer, 0 when nothing was used. Any
member who may view the project can read it; a project you cannot see is
404 not_found.
Totals update every few minutes; the latest minutes and the current hour may
not be in them yet. These are raw units, not a bill.
The MCP tool
project_get_usage on the management MCP takes projectId,
from and to and answers the same. The workflows and webhooks meters alone
are also readable with a secret key (Usage).