The slippage tollerace as a percentage up to a maximum of two decimal places. For Uniswap Protocols (v2, v3, v4), the slippage tolerance is the maximum amount the price can change between the time the transaction is submitted and the time it is executed. The slippage tolerance is a percentage of the total value of the swap.
When submitting a quote, note that slippage tolerance works differently in UniswapX swaps where it does not set a limit on the Spread in an order. See here for more information.
Note that if the trade type is EXACT_INPUT, then the slippage is in terms of the output token. If the trade type is EXACT_OUTPUT, then the slippage is in terms of the input token.
When submitting a request, slippageTolerance may not be set when autoSlippage is defined. One of slippageTolerance or autoSlippage must be defined.