Cardtronics Inc. announced Thursday that Valero Energy Corp. is making the automated teller machine operator its exclusive service provider at Valero convenience stores.

As a part of the deal, Cardtronics, of Houston, is placing more than 950 cash machines at the gasoline retailer's shops. Valero Energy is a unit of Valero Retail Holdings Inc., of San Antonio.

Cardtronics owns or operates roughly 52,800 retail ATMs. Its Allpoint Network provides surcharge-free access to the customers of member banks.