Invalid parameter value url

Hi, please help me to understand what I'm doing wrong.
I'm making this request:
curl --header "Content-Type: application/json" \
-H 'Authorization:Bearer ******' \
--request POST \
--data '{"name": "check_google", "host": "www.google.com", "type": "http", "url":"checkme"}' \
https://api.pingdom.com/api/3.1/checks

Get this response:
{"error":{"statuscode":400,"statusdesc":"Bad Request","errormessage":"Invalid parameter value => url"}}