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I'm calling a URL to get json data from another web site in my Google App Engine application. Then i received bellow message.

The Socket API will be enabled for this application once billing has been enabled in the admin console

So I decided to enable billing, but I have a question: For Mail API, we can send 100 messages for a day for free. Is there any similar free default limit for Socket API ?

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According to the Google App Engine documents for their API's, such as here for Java and here for Go:

Sockets are only available for paid apps, and traffic from sockets is billed as outgoing bandwidth.

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