Does this Stack Exchange API endpoint count towards quota usage? : 

> http://api.stackexchange.com/docs/read-access-tokens

(This is the  most promising API call I found for verifying the validity of an `access_token`.)

I'm doing user authentication, not Stack Exchange API calls.  
My application's cache acts as the first level for checking whether a user is still logged in, but when a call slips through, it has to hit some API call on Stack Exchange API to verify whether the token is still valid.


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Which gets me to my second question:  
Is there a purpose-built endpoint just for verifying the validity of an `access_token`?  
GitHub apparently has:

> [#check-an-authorization](https://developer.github.com/v3/oauth_authorizations/#check-an-authorization) (*"OAuth applications can use a special API method for checking OAuth token validity without running afoul of normal rate limits for failed login attempts"*)