It means market traders, taxis and shops will be able to accept credit and debit cards as well as Paypal payments.
There will be an initial cost "under £100" for the Paypal Here device.
The firm, which faces competition from other similar devices, said it will take a transaction fee of less than 3%.
"At Paypal, we spend a huge amount of time talking and listening to small businesses. They are the core of Paypal's business and they've told us that they want a simple, secure way to take card payments anytime and anywhere they trade," said David Marcus, president of Paypal.
Paypal is offering the devices to a few select businesses before a full launch in the summer. It will roll out in the UK first with other countries to follow.
In the US, it has already brought out a similar device, a dongle that can be plugged into a mobile phone to act as a credit card reader.
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