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Support for multiple legacy options for the routingPreference field in the /quote request has been sunset. What changed? The routingPreference field in the /quote request now only supports the values BEST_PRICE or FASTEST. The legacy values of CLASSIC, BEST_PRICE_V2, UNISWAPX_V2, V3_ONLY, and V2_ONLY have been removed. Submitting a request with one of these legacy values will result in an error. Why did this change? This change clarifies API request intent and allows Uniswap Labs to expand the options for routing in the future. The routingPreference field now only indicates the method of routing, whereas the protocols field indicates the protocols to be considered while executing the routing method. What do I need to do? If you are still specifying a deprecated routingPreference value, you must update your requests to use one of the supported values (BEST_PRICE or FASTEST). You may also use the protocols field to more narrowly limit which protocols are considered for your /quote requests. If you do not specify any value for routingPreference, the default is BEST_PRICE.

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Legacy routingPreference to protocols Equivalency

The following table maps deprecated routingPreference values to equivalent protocols field values:
Legacy routingPreference ValueEquivalent protocols Value
CLASSICV2, V3, V4
UNISWAPX_V2UNISWAPX_V2
BEST_PRICE_V2V2, V3, V4, UNISWAPX_V2
V2_ONLYV2
V3_ONLYV3