BooleanFilter

Should be used to filter items by boolean fields.

Syntax: ?property=<true|false|1|0>

use SourceBroker\T3api\Annotation as T3api;
use SourceBroker\T3api\Filter\SearchFilter;

/**
 * @T3api\ApiResource (
 *     collectionOperations={
 *          "get"={
 *              "path"="/users",
 *          },
 *     },
 * )
 *
 * @T3api\ApiFilter(
 *     SearchFilter::class,
 *     properties={"isAdmin", "isPublic"},
 * )
 */
class User extends \TYPO3\CMS\Extbase\Domain\Model\FrontendUser
{
}

Real examples. Install T3API Demo and try those links below.