Create a monitor

Creates a monitor that watches a list.

Permits and cases filed on the list's places are sent as permit.created and case.created to every webhook subscribed to them, within a day of being published. A place added to the list later is watched from when it is added. An item's filter applies to the parcels each permit or case is about. A list that already has a monitor returns it with 200.

Parameters

No parameters.

Request body

listrequiredstring: The id of the list to watch.
activeboolean: Whether the monitor produces events. Defaults to true.

Responses

200: empty; The list's existing monitor, unchanged.
201: monitor object; The monitor.
401: ProblemDetail; credential_missing, credential_invalid or credential_expired. The request has no valid credential.
403: ProblemDetail; scope_missing, person_required, api_key_not_accepted or entitlement_missing. The credential or plan does not allow this request. detail names the reason.
422: ProblemDetail; parameter_invalid, id_malformed or a cursor code. A parameter is missing or invalid. errors lists each one.
429: ProblemDetail; rate_limited. Too many requests. Retry after the Retry-After interval. Nothing is charged.

Credits

Free.

Example request

curl -X POST 'https://api.placestack.com/v1/monitor' \
  -H "Authorization: Bearer $PLACESTACK_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
  "list": "lst_01h455vb4pex5vsknk084sn02q"
}'

Example response

{
  "object": "monitor",
  "id": "mon_01h455vb4pex5vsknk084sn02q",
  "list": "lst_01h455vb4pex5vsknk084sn02q",
  "active": true,
  "created_at": "2026-09-13T12:00:00Z",
  "updated_at": "2026-09-13T12:00:00Z",
  "href": "/v1/monitor/mon_01h455vb4pex5vsknk084sn02q"
}

Parameters

Request body

Responses

Credits

Next steps

GET /monitor/{monitor_id}