With this release, the free usage limits are changed. Each new account is in free trial mode by default. Every account is provided with 3000 free measurement data sample points. These points can be used to evaluate the service in full. This provides you an access to the service for over a month with a single sensor updated once per 15 minutes.
The limit for only single sensor is removed for the free usage. Also the upload rate of 15 minutes is gone and the maximum of 1 minute upload rate can be used. Once the free quota has been consumed, the service will not accept any new sensor data until valid subscription to the service exists.