JPMorgan Chase & Co. is betting it can capture market share from other issuers by taking a feature of the flagship charge card issued by one of its rivals, American Express Co., and embedding it in a credit card.

Chase Blueprint, an online billing platform unveiled Tuesday, allows 20 million cardholders to finance certain purchases while paying others in full each month interest-free. Customers then choose the number of monthly installments, and Blueprint calculates the interest they can save by paying more than the monthly minimum.

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