When I exchange in TOKEN for WETH or WHET for a TOKEN, the result obtained with trade.outputAmount always gives me the same result as in the uniswap UI.

But when I go to obtain the output price in a TOKEN TRADE for another TOKEN erc-20 I get a different result. Always lower than the one offered by the uniswap UI at the same time.

My code

const TOKENP = new Token(ChainId.MAINNET, tokenw.hash, tokenw.decimals);
const TOKEN_M = new Token(ChainId.MAINNET, tokenm.hash, tokenm.decimals); //
const pair3 = await Fetcher.fetchPairData(TOKEN_M ,TOKEN_P);
const route3 = new Route([pair3], TOKEN_P);
let qtyToken = Math.pow(10, 18)*1;
const tradeM = new Trade(route3, new TokenAmount( TOKEN_P, qtyToken ), TradeType.EXACT_INPUT)
return tradeM.outputAmount.toSignificant(6); 

Shouldn't this code give me the exact data from the uniswap UI just like it happens to me when I trade with ETH? This difference increases when the amount of the input token increases. In this case this 1 unit.

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1 Answer 1


Not familiar with Uniswap SDK so the best I can offer is my logic, isnt your code fetching info from uniswap v3? i see you're using v2 on the UI

  • I am using SDK V2 Commented Jul 30, 2021 at 12:00

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