Google Inc. is planning to increase most of the fees it charges merchant users of its Checkout payment system.

Starting May 5 merchants will pay a 30-cent base fee for each sale, plus a volume-based fee ranging from 1.9% to 2.9% of the transaction's value, the Mountain View, Calif., company said in a blog post Wednesday. It currently charges a 20-cent base fee plus 2% of the transaction.

Google currently waives some of the fees for merchants that advertise on Google through its AdWords service, but these waivers will no longer be available, the company said.

The new rates are comparable to those charged by eBay Inc.'s PayPal Inc.