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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).