Limits

Free while in early access. No card needed. There’s no request rate limit set on the API today. Sending volume is controlled the same way as in the app: each mailbox’s daily limit, the campaign’s sending window and the gaps between sends.

Caps on individual calls

Call	Cap
`GET /campaigns/{campaign_id}/leads/list`	Page size 10 to 200
`GET /mailboxes/list`	Page size 10 to 1,000
`GET /inbox/threads`	500 threads, with a `truncated` flag
`GET /crm`	60 cards per column (the count is the real total)
`GET /analytics`	Date range up to 365 days
`POST /campaigns/{campaign_id}/leads/csv`	Error list capped at 100, with `total_errors`
`POST /testing/send`	100 recipients
`POST /mailboxes/connect-microsoft-tenant`	100 addresses per call
`POST /mailboxes/{mailbox_id}/tags`	20 tags per mailbox, 40 characters each

Each endpoint’s page in the API reference lists its own rules.

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Concepts

Reference

Caps on individual calls

​Caps on individual calls

Caps on individual calls