Any token on the Uniswap Labs Default Tokens List can be routed through UniswapX.
UniswapX quotes are subject to change based on whether the filler market is able to execute to swap competitively.
There are instances when UniswapX may not always be able to provide a competitive quote. In this instance, the swap will be routed through liquidity pools on Uniswap v2, v3, and v4.