keystone/api-ref/source/v2-admin/samples/admin/endpoint-create-request.json

{
    "endpoint": {
        "adminurl": null,
        "internalurl": null,
        "publicurl": "http://host-3:8774/v1.1/$(tenant_id)s",
        "region": "RegionOne",
        "service_id": "aea0aa3723e34ee3a5ac49ce86d4cc6e"
    }
}