Visa Inc (V.N) and MasterCard Inc (MA.N) are in talks with Fidelity to replace AmEx, Bloomberg cited the sources as saying. Warehouse club retailer Costco Wholesale Corp (COST.O) said on Feb. 12 that it would end a 16-year-old agreement of accepting AmEx credit cards at U.S. stores from next year, which threatened a near 8 percent of worldwide annual spending on AmEx cards.