Originally posted at TechCrunch by Zack Whittaker

How much is your palm print worth? If you ask Amazon, it’s about $10 in promotional credit if you enroll your palm prints in its checkout-free stores and link it to your Amazon account.

Last year, Amazon introduced its new biometric palm print scanners, Amazon One, so customers can pay for goods in some stores by waving their palm prints over one of these scanners. By February, the company expanded its palm scanners to other Amazon grocery, book and 4-star stores across Seattle.

Amazon has since expanded its biometric scanning technology to its stores across the U.S., including New York, New Jersey, Maryland and Texas.

The retail and cloud giant says its palm scanning hardware “captures the minute characteristics of your palm — both surface-area details like lines and ridges as well as subcutaneous features such as vein patterns — to create your palm signature,” which is then stored in the cloud and used to confirm your identity when you’re in one of its stores…

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