A year after launching its contactless credit cards - Chase cards branded 'blink' - JPMorgan's Chase Bank unit has issued nearly seven million cards with 'blink' to card members in nine US states.

Chase card members may now use their cards with ‘blink’ at more than 25,000 merchant locations nationwide, ranging from convenience stores to sports stadia and forecourts.

Partnering with Visa US and MasterCard Worldwide, Chase was the first issuer to broadly offer contactless credit cards to consumers, the bank says.

Merchants and consumers benefit from ‘blink’ with the speed, convenience and easy-to-use contactless payment method, Chase claimed in a statement.

The company says that the technology has helped to increase the average ticket sale for some merchants by 40% more than cash purchases, and increased the frequency of everyday purchases at many contactless-enabled merchants by 35% over credit cards with traditional magnetic stripes.