Under TJAR's market structure, applications deposit collected fees into a Token Jar contract, allowing third-party searchers to compete to convert the assets by fulfilling requested target payouts via a Releaser contract.

From the articleCryptocurrency News - Investing.comAlso in Uniswap Labs launches TJAR with Robinhood as first partner, Uniswap Labs opens fee conversion tool TJAR to apps, starting with Robinhood, Uniswap's Token Jar lets apps collect fees in a single token of their choice