August 17, 2026: The Domains API now supports batch domain availability checking via POST /v3/domains/check-availability

We've added POST /v3/domains/check-availability to the Domains API, so you can check the availability and indicative pricing of up to 25 domains in a single request instead of making one call per domain.

What changed

A new endpoint is available:

• POST /v3/domains/check-availability — accepts a JSON body with a domains array (1–25 names) and returns one Availability result per domain in request order inside { "items": [...] }. Domains that cannot be checked carry an error object on that item rather than failing the whole request.

One optional request field gives you control over the check behavior:

• optimizeFor — SPEED (default) uses cached zone data for a fast response; ACCURACY performs a live registry check for authoritative availability at higher latency.

Availability results are best-effort and indicative. The authoritative availability check always runs at quote time (POST /v3/domains/registration-quotes).

For single-domain checks without a request body, the existing GET /v3/domains/check-availability endpoint is unchanged.

Who is affected

Any developer building domain search or catalog experiences on the Domains API. The domains.domain:read OAuth scope is required — no new scope is needed if you already call the GET endpoint.

Existing integrations using GET /v3/domains/check-availability are unaffected.

Links

• Domains API reference — POST /v3/domains/check-availability request and response schema
• Registration quotes — authoritative availability is confirmed at quote time

Last updated on