Check domain availability
Submit up to 50 domains. Tells you which are free to register and
which mailbox types each can take (usable_for).
Taken, premium, invalid, or errored names return available: false
with a reason. Tenant answers can be cached up to 35 days; see
How domains work.
Sandbox keys return deterministic local results and never call a registrar or tenant provider.
POST
Check domain availability
Authorizations
Partner API key (pk_live_… or pk_test_…).
Body
application/json
Domain names to check (e.g. acme.com). Up to 50 per call.
Maximum array length:
50Response
One row per domain you sent.
Last modified on August 25, 2026
Check domain availability