Consumers using GBuy, which is set for release on June 28, will be taken off the merchant's site to complete the payment. This will enable Google (nasdaq: GOOG - news - people ) to capture e-commerce transaction data, driving more precise targeting in future searches.

GBuy looks to be a direct competitor to PayPal's "off-eBay" initiative, which is still early in its development, Rohan added. During the beta phase, Google will not charge merchants for its payment service. After some period, the analyst believes Google will charge 1.5% to 2%, in-line to slightly below that of PayPal.