I know it’s old, but…
It will not work unless you use double quotes and escape the others inside like this:
curl -u : -X POST https://api.pushbullet.com/v2/pushes –header ‘Content-Type: application/json’ –data-binary “{\”type\”: \”note\”, \”title\”: \”$MONIT_HOST\”, \”body\”: \”$MONIT_SERVICE – $MONIT_DESCRIPTION\”}”