Filter results by one or more tag names. When multiple tags are provided, results matching any of the specified tags are returned (OR logic).

Filter results by one or more resource types.

Filter media by custom metadata field value, keyed by field key:
custom_metadata[<field_key>]=<value>. Only available on accounts with access to
custom metadata (other accounts receive a 403 when this parameter is passed).
Custom metadata only exists on media, so results contain media only and
resource_type must include media. Use an empty q to match all media.

The value shape depends on the field's type:

• Select and text fields take a value
  (custom_metadata[region]=emea) or an array of values matched as OR
  (custom_metadata[region][]=emea&custom_metadata[region][]=amer). Select fields
  match on option keys.
• Boolean fields take true or false.
• Number and time fields take an exact number (custom_metadata[year]=2026)
  or a range object (custom_metadata[budget][min]=100&custom_metadata[budget][max]=500;
  either bound may be omitted).
• Date and datetime fields take a YYYY-MM-DD date matching that UTC day, or a
  range object with ISO8601 bounds (custom_metadata[shoot_date][after]=2026-01-01,
  custom_metadata[shoot_date][before]=2026-02-01T00:00:00Z). A bare-date bound
  covers its whole UTC day: after starts at the day's beginning and before
  runs through the day's end.
• Any field type accepts a presence filter: custom_metadata[region][exists]=false
  returns media missing the field entirely (useful for metadata coverage audits),
  and exists=true returns media that have any value for it.

Unknown or archived field keys return a 400, as do select option keys that don't
exist on the field. The primary match set holds at most 100 media with no
pagination; a non-blank q can add up to 100 more transcript-only matches, and
an empty-q audit returns at most 100. Narrow large audits (e.g. with
created_after/created_before) to complete full coverage.