Login into vRA appliance
Then execute below command
curl --insecure -f -s -H "Content-Type: application/json" "https:/$HOSTNAME/component-registry/services/status/current?limit=200" | sed "s/}/\n/g" | grep -E -o ".serviceName.*serviceInitializationStatus.[^,]*" | sed "s/\"serviceTypeId.*,//g" | sed -e "s/\"//g" -e "s/:/=/g" -e "s/,/, /" | sed -e "s/serviceName\|serviceInitializationStatus\|=\|,\|null//g" | column -t | sort | cat -n
The output would show the list of services registered on this appliance