According to the official announcement, Uniswap Labs will charge a 0.15% exchange (swap) fee for certain tokens in its web application and wallet starting from October 17, including: ETH, USDC, WETH, USDT, DAI, WBTC, agEUR, GUSD, LUSD, EUROC, XSGD.
These tokens are only charged when transacting on mainnet and L2 via the Uniswap Labs interface to sustainably fund Uniswap operations. Fees will only be charged on exchange transactions where there is a fee for both selling and buying tokens. Exchanges from one stablecoin to another and packaged transactions between ETH and WETH are not affected and are not applicable to this charge.
Uniswap stated that the above fees are separate from the Uniswap protocol fee switch, which is determined by a Uniswap governance vote. Uniswap Labs is committed to providing simple and transparent pricing strategies.