You can use the Street View Image API in both web based and mobile apps, and the size limits and daily quotas match those of the Static Maps API for both the consumer Maps API and Maps API Premier. You can display Street View images in your apps using this API without a corresponding Google map, but if you do choose to display a map it must be provided by Google. For more details on how to use the Street View Image API please refer to the documentation.
To make it easier to find help using the Street View Image API and Static Maps API, we’re also launching a new forum today dedicated to these services. If you have any questions regarding use of these APIs going forward we recommend you head over to the new Google Maps Image APIs group. We look forward to seeing you there!