Legal · Terms
Fair terms, plainly stated.
The short version: use Calder for lawful transactional email, pay for what you use, and we'll hold up our end on delivery and transparency. Last updated September 2026.
Acceptable use
Transactional email only — messages your users triggered or explicitly requested. No purchased lists, no bulk marketing, no spam. Accounts with sustained high bounce or complaint rates are throttled, then suspended, to protect every other sender on the platform.
Plans and billing
Quotas are hard limits, not overage traps: when you hit yours, sends pause with a clear error until you upgrade or the cycle resets. Usage is metered from durable records — if an invoice ever disagrees with your dashboard, the invoice is wrong and we'll fix it.
Uptime and liability
We architect for reliability — async delivery, retries, provider abstraction — and publish our record on the status page. That said, email traverses systems we don't control; our liability is limited to the fees paid in the affected period.
Changes
Material changes to these terms come with notice and a changelog entry. Continued use after changes take effect constitutes acceptance.