Basic Attention Token (BAT) is an ERC-20 utility token built on Ethereum, designed to create a decentralized digital advertising exchange. It utilizes an on-device attention measurement system and blockchain technology to anonymously track user engagement with content and ads, eliminating the need for third-party trackers.

The token facilitates a new advertising model where advertisers pay publishers in BAT for user attention. This system rewards users and publishers within the Brave browser ecosystem, offering benefits such as increased privacy, reduced fraud, and a more transparent valuation of attention.