Watches, wristbands, jewellery, key fobs and other so-called wearables, as well as mobile phones, are expected to follow a surge in tap-and-go payments in countries where card issuers, banks, retailers and consumers have embraced the technology.
Some 75 million wearable products are expected to be shipped this year by people looking at alternatives to tapping a card on a merchant's terminal, almost treble the 29 million shipped last year, according to technology research firm CCS Insight.
CCS Insight predicts the spike in wearables this year will be followed by shipments more than doubling again by 2018 to leave more than 340 million wearable devices in use. Most will be smartwatches and wristbands, though payments will also be made via wearable cameras, jewellery, tokens and eyewear.
"Payments is a really key element in the direction of technology at the moment. There are lots of companies trying to crack this nut, and the key is it needs to be secure and easy," said Ben Wood, analyst at CCS.

So far, much of the shake-up in payments has been in how transactions are processed, far out of the sight of customers. But the rollout of Apple Pay in the United States in October and in Britain this week has thrust the way consumers pay into the spotlight.
The "Apple effect" can often help rivals too, and some expect the launch to mark a tipping point for contactless payments.