Price Index for DEX Tokens: How DEX Token Prices Are Calculated and Queried

A token that trades on a DEX has no official price. It has pools, each with its own ratio of two tokens, and most of the time none of those pools pairs it with a dollar. That is the problem this post first described in 2021, when the only answer was to chain prices by hand: token to WETH, WETH to USDT, weighted by whatever volume you could find.