Retrieved 2026-09-27
Cooper Email vs the Gmail API
The Gmail API reads and sends mail for an existing Google account. It does not create a new inbox for an agent.
Google’s quota page (last updated 2026-09-10 UTC) says standard use has no additional cost, and that charges for usage above a daily threshold are planned later in 2026.
Sources: Gmail API usage limits
| Gmail API | Cooper Email | |
|---|---|---|
| Inbox | An existing Gmail or Google Workspace mailbox, authorized with OAuth | POST /api/v1/onboard creates username@cooperemail.com and an API key |
| Price | No additional cost for standard use. Daily billing threshold is 80,000,000 quota units per project per day before charges are planned. | $0 · 5 inboxes · 5,000 emails/month · 0 custom domains |
| Send quota | messages.send costs 100 quota units. Per-user per-project limit is 6,000 units per minute. Per-project limit is 1,200,000 units per minute. | Plan caps: Free 5,000/month, Starter 25,000/month, Pro 250,000/month. No separate per-minute cap in Cooper’s API. |
| Isolation | The human’s mailbox, unless you provision a separate Google user | One inbox per agent on the Cooper account |
| Search | Gmail search syntax on that mailbox | Account-wide full-text search across Cooper inboxes |
- Google Workspace user licenses are separate from the API page and are not quoted here.
- A 500-recipient cap per message is stated on the same quota page.