# Dual-token System

There are two units of exchange: VII tokens and Attention Credits (AC).

VII tokens are the native cryptocurrency earned in the Viide ecosystem. (See earning metrics [here](/using-viide/earning-metrics.md))

Attention Credits are designed to be the only payment to level up your CartonOwls. (See CartonOwl [intro](/nft/the-cartonowls.md).)

Attention Credits are pegged to the U.S. dollar on a 1:0.01 basis(1AC=$0.01).

Attention Credits, like pre-paid telephone minutes or airline miles, are non-transferable and may only be used by the person who purchased them.

Viide users can buy AC ONLY with VII. Any VII that is converted to Attention Credits is permanently withdrawn from circulation ("burned").<br>


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