Uniswap Labs, the key company building atop decentralized crypto exchange Uniswap, will impose a 0.15% fee starting Tuesday on trades involving ETH, USDC and other tokens. Only swaps that execute through Uniswap Labs’ front end will be taxed.

The fee is different from Uniswap’s existing “protocol fee” that’s managed by governance voters. It’s being levied by Uniswap Labs in an effort to “sustainably fund our operations,” a blog post said.

“This interface fee is one of the lowest in the industry, and it will allow us to continue to research, develop, build, ship, improve, and expand crypto and DeFi,” Uniswap’s inventor Hayden Adams said in a tweet.

The new “interface fee” impacts trades involving at least two of the following tokens: ETH, USDC, WETH, USDT, DAI, WBTC, agEUR, GUSD, LUSD, EUROC or XSGD, according to an FAQ. Stablecoin swaps will not be taxed and neither will traded between ether and wrapped ether.

After this story was published, a Uniswap spokeswoman wrote that she “just wanted to clarify that both the input and output token need to be on the list for the fee to apply (not just on one end).”