
The move is believed to be a retaliation against a protest party that Google intended to stage at the Ebay Live conference that takes place in Boston later this week.
Google's "Let Freedom Ring" party has since been cancelled, but was scheduled to take be held in the Old South Meeting House in Boston, which was a key meeting place for participants during the early days of the American Revolution.
The Google party would have highlighted www.vnunet.com, a payment technology that the search engine introduced in June 2006. The service competes with Ebay's Paypal.
Ebay www.vnunet.comthe Google service, officially because it lacking a safety track record. But Google has charged that there is no need for a ban now that Google Checkout has been adopted by more than 500 online retailers.
Ebay didn't immediate return a request for comment.
The auction website's has officially stated that the advertising move was the result of a regular reallocation of its marketing budgets. The company however has acknowledged that the event ruffled the features of some high level executives.