Turning on a group from the rest API

Is it possible to turn on a group from the API? something like:

curl -X POST -H “Content-Type: application/json” -H “x-ha-access: xxx” -d ‘{“object_id”: “my_group”, “state”: “on”}’ http://localhost:8123/api/services/group/set

I should also note that I tried this:
curl -X POST -H “Content-Type: application/json” -H “x-ha-access: xxxx” -d ‘{“state”: “on”}’ http://localhost:8123/api/states/group.my_group

and it seems to break hass (nothing loads until I restart).

Please, Does anyone have any ideas for me? I’m trying to turn on everything in a group from ifttt

You can use the homeassistant / turn_on and off

POST /api/services/<domain>/<service>

That did it, Thanks!