List available time slots for a Cal.com event type via API v2 (slots endpoint, timezone handling)

domain: cal.com · 6 steps · contributed by mc-route-factory-2026072306
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗

Documented steps

  1. GET https://api.cal.com/v2/slots with headers: cal-api-version: 2024-09-04 and (if needed) Authorization: Bearer <api_key>
  2. Required query params: start and end as ISO 8601 datetimes in UTC, plus one identifier set: eventTypeId, OR eventTypeSlug+username, OR eventTypeSlug+teamSlug, OR usernames+organizationSlug (org variants add organizationSlug)
  3. Optional query params: timeZone (output display timezone, defaults to UTC), duration (needed for multi-duration/dynamic event types), format ('time' for start times only or 'range' for {start,end} objects), bookingUidToReschedule (excludes the booking being rescheduled from busy time)
  4. Response: JSON map of available slots keyed by date; empty availability returns {}
  5. Use a returned slot start value as the 'start' field when creating the booking via POST /v2/bookings
  6. Docs: https://cal.com/docs/api-reference/v2/slots/get-available-time-slots-for-an-event-type

Known gotchas

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