I need help in knowing about what is the cost per requests after limit is exceeded(10,000requests/day)? In console.developers.google.com I didn't find the pricing for google+ requests. There is a service to increase the Quota of requests per day which is free service, but I don't need this increasing Quota. Anyhow please let me know about maximum increase in requests Quota also.
The Google+ API only has the free quota. There is no billable extension quota.
In theory Google could increase the requests quota to just about anything assuming you can convince them it's for a good reason.