CODEWITHSUNDEEP
typescriptethers.jsuniswap
Dajeir
Dajeir

Reputation: 51

Uniswap V3 router

Found a code where swap goes through exact pool on polygon uniswap v3. Need to change the method to use different pools in router, depending on price. Now all transactions use ExactOutputSingle. If someone knows how to change that, please help

  async split(signer: Signer): Promise<void> {
    const address = await signer.getAddress();
    const { buyToken, sellToken, buyAmount } = await this.calculateSplitPurchase(address);

    if (buyAmount.lessThan(0) || buyAmount.equalTo(0)) {
      return;
    }

    console.log(`Buying ${buyAmount.toFixed()} ${buyToken.name} with ${sellToken.name}`);
    const route = new Route([this.pool], sellToken, buyToken);
    const amountIn = await this.quoter.callStatic.quoteExactOutputSingle(
      sellToken.isNative ? WETH_ADDRESS : sellToken.address,
      buyToken.isNative ? WETH_ADDRESS : buyToken.address,
      this.pool.fee,
      buyAmount.quotient.toString(10),
      0,
    );
    const trade = Trade.createUncheckedTrade({
      route,
      tradeType: TradeType.EXACT_OUTPUT,
      inputAmount: CurrencyAmount.fromRawAmount(sellToken, amountIn.toString()),
      outputAmount: CurrencyAmount.fromRawAmount(buyToken, buyAmount.quotient.toString(10)),
    });

    const params = SwapRouter.swapCallParameters([trade], {
      slippageTolerance: new Percent(2, 1000),
      recipient: address,
      deadline: ethers.constants.MaxUint256.toString(),
    });

    await this.swap(signer, params);
  }

  async swap(signer: Signer, params: MethodParameters): Promise<void> {
    const tx = await signer.sendTransaction({
      to: this.router.address,
      from: await signer.getAddress(),
      data: params.calldata,
      value: params.value,
      //gasPrice: await getFastGasPrice(),
      //gasLimit: 1300000,
    });
    await tx.wait(3);
  }

Upvotes: 0

Views: 971

Answers (1)

Crypto_Rachel
Crypto_Rachel

Reputation: 154

You would have two choices, you could search for and gather data from the pools that you want to trade, then you could build paths and use the quoter to get best returns, Or you could use the Uniswap auto router code (what the UI uses to get best price)

https://docs.uniswap.org/sdk/guides/auto-router

Upvotes: -1

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