✨Create & execute a swap using Stellaswap pools to obtain xcTokens

How to add a post-hook leveraging xcTokens liquidity pools available on Moonbeam parachain to a route request after a cross-chain swap from an EVM chain using Squid SDK

Uniswap V2 Pool ABI

const stellaSwapABI = [
  {
    inputs: [],
    name: "WETH",
    outputs: [{ internalType: "address", name: "", type: "address" }],
    stateMutability: "pure",
    type: "function",
  },
  {
    inputs: [
      { internalType: "address", name: "tokenA", type: "address" },
      { internalType: "address", name: "tokenB", type: "address" },
      { internalType: "uint256", name: "amountADesired", type: "uint256" },
      { internalType: "uint256", name: "amountBDesired", type: "uint256" },
      { internalType: "uint256", name: "amountAMin", type: "uint256" },
      { internalType: "uint256", name: "amountBMin", type: "uint256" },
      { internalType: "address", name: "to", type: "address" },
      { internalType: "uint256", name: "deadline", type: "uint256" },
    ],
    name: "addLiquidity",
    outputs: [
      { internalType: "uint256", name: "amountA", type: "uint256" },
      { internalType: "uint256", name: "amountB", type: "uint256" },
      { internalType: "uint256", name: "liquidity", type: "uint256" },
    ],
    stateMutability: "nonpayable",
    type: "function",
  },
  {
    inputs: [
      { internalType: "address", name: "token", type: "address" },
      { internalType: "uint256", name: "amountTokenDesired", type: "uint256" },
      { internalType: "uint256", name: "amountTokenMin", type: "uint256" },
      { internalType: "uint256", name: "amountETHMin", type: "uint256" },
      { internalType: "address", name: "to", type: "address" },
      { internalType: "uint256", name: "deadline", type: "uint256" },
    ],
    name: "addLiquidityETH",
    outputs: [
      { internalType: "uint256", name: "amountToken", type: "uint256" },
      { internalType: "uint256", name: "amountETH", type: "uint256" },
      { internalType: "uint256", name: "liquidity", type: "uint256" },
    ],
    stateMutability: "payable",
    type: "function",
  },
  {
    inputs: [],
    name: "factory",
    outputs: [{ internalType: "address", name: "", type: "address" }],
    stateMutability: "pure",
    type: "function",
  },
  {
    inputs: [
      { internalType: "uint256", name: "amountOut", type: "uint256" },
      { internalType: "uint256", name: "reserveIn", type: "uint256" },
      { internalType: "uint256", name: "reserveOut", type: "uint256" },
    ],
    name: "getAmountIn",
    outputs: [{ internalType: "uint256", name: "amountIn", type: "uint256" }],
    stateMutability: "pure",
    type: "function",
  },
  {
    inputs: [
      { internalType: "uint256", name: "amountIn", type: "uint256" },
      { internalType: "uint256", name: "reserveIn", type: "uint256" },
      { internalType: "uint256", name: "reserveOut", type: "uint256" },
    ],
    name: "getAmountOut",
    outputs: [{ internalType: "uint256", name: "amountOut", type: "uint256" }],
    stateMutability: "pure",
    type: "function",
  },
  {
    inputs: [
      { internalType: "uint256", name: "amountOut", type: "uint256" },
      { internalType: "address[]", name: "path", type: "address[]" },
    ],
    name: "getAmountsIn",
    outputs: [
      { internalType: "uint256[]", name: "amounts", type: "uint256[]" },
    ],
    stateMutability: "view",
    type: "function",
  },
  {
    inputs: [
      { internalType: "uint256", name: "amountIn", type: "uint256" },
      { internalType: "address[]", name: "path", type: "address[]" },
    ],
    name: "getAmountsOut",
    outputs: [
      { internalType: "uint256[]", name: "amounts", type: "uint256[]" },
    ],
    stateMutability: "view",
    type: "function",
  },
  {
    inputs: [
      { internalType: "uint256", name: "amountA", type: "uint256" },
      { internalType: "uint256", name: "reserveA", type: "uint256" },
      { internalType: "uint256", name: "reserveB", type: "uint256" },
    ],
    name: "quote",
    outputs: [{ internalType: "uint256", name: "amountB", type: "uint256" }],
    stateMutability: "pure",
    type: "function",
  },
  {
    inputs: [
      { internalType: "address", name: "tokenA", type: "address" },
      { internalType: "address", name: "tokenB", type: "address" },
      { internalType: "uint256", name: "liquidity", type: "uint256" },
      { internalType: "uint256", name: "amountAMin", type: "uint256" },
      { internalType: "uint256", name: "amountBMin", type: "uint256" },
      { internalType: "address", name: "to", type: "address" },
      { internalType: "uint256", name: "deadline", type: "uint256" },
    ],
    name: "removeLiquidity",
    outputs: [
      { internalType: "uint256", name: "amountA", type: "uint256" },
      { internalType: "uint256", name: "amountB", type: "uint256" },
    ],
    stateMutability: "nonpayable",
    type: "function",
  },
  {
    inputs: [
      { internalType: "address", name: "token", type: "address" },
      { internalType: "uint256", name: "liquidity", type: "uint256" },
      { internalType: "uint256", name: "amountTokenMin", type: "uint256" },
      { internalType: "uint256", name: "amountETHMin", type: "uint256" },
      { internalType: "address", name: "to", type: "address" },
      { internalType: "uint256", name: "deadline", type: "uint256" },
    ],
    name: "removeLiquidityETH",
    outputs: [
      { internalType: "uint256", name: "amountToken", type: "uint256" },
      { internalType: "uint256", name: "amountETH", type: "uint256" },
    ],
    stateMutability: "nonpayable",
    type: "function",
  },
  {
    inputs: [
      { internalType: "address", name: "token", type: "address" },
      { internalType: "uint256", name: "liquidity", type: "uint256" },
      { internalType: "uint256", name: "amountTokenMin", type: "uint256" },
      { internalType: "uint256", name: "amountETHMin", type: "uint256" },
      { internalType: "address", name: "to", type: "address" },
      { internalType: "uint256", name: "deadline", type: "uint256" },
      { internalType: "bool", name: "approveMax", type: "bool" },
      { internalType: "uint8", name: "v", type: "uint8" },
      { internalType: "bytes32", name: "r", type: "bytes32" },
      { internalType: "bytes32", name: "s", type: "bytes32" },
    ],
    name: "removeLiquidityETHWithPermit",
    outputs: [
      { internalType: "uint256", name: "amountToken", type: "uint256" },
      { internalType: "uint256", name: "amountETH", type: "uint256" },
    ],
    stateMutability: "nonpayable",
    type: "function",
  },
  {
    inputs: [
      { internalType: "address", name: "tokenA", type: "address" },
      { internalType: "address", name: "tokenB", type: "address" },
      { internalType: "uint256", name: "liquidity", type: "uint256" },
      { internalType: "uint256", name: "amountAMin", type: "uint256" },
      { internalType: "uint256", name: "amountBMin", type: "uint256" },
      { internalType: "address", name: "to", type: "address" },
      { internalType: "uint256", name: "deadline", type: "uint256" },
      { internalType: "bool", name: "approveMax", type: "bool" },
      { internalType: "uint8", name: "v", type: "uint8" },
      { internalType: "bytes32", name: "r", type: "bytes32" },
      { internalType: "bytes32", name: "s", type: "bytes32" },
    ],
    name: "removeLiquidityWithPermit",
    outputs: [
      { internalType: "uint256", name: "amountA", type: "uint256" },
      { internalType: "uint256", name: "amountB", type: "uint256" },
    ],
    stateMutability: "nonpayable",
    type: "function",
  },
  {
    inputs: [
      { internalType: "uint256", name: "amountOut", type: "uint256" },
      { internalType: "address[]", name: "path", type: "address[]" },
      { internalType: "address", name: "to", type: "address" },
      { internalType: "uint256", name: "deadline", type: "uint256" },
    ],
    name: "swapETHForExactTokens",
    outputs: [
      { internalType: "uint256[]", name: "amounts", type: "uint256[]" },
    ],
    stateMutability: "payable",
    type: "function",
  },
  {
    inputs: [
      { internalType: "uint256", name: "amountOutMin", type: "uint256" },
      { internalType: "address[]", name: "path", type: "address[]" },
      { internalType: "address", name: "to", type: "address" },
      { internalType: "uint256", name: "deadline", type: "uint256" },
    ],
    name: "swapExactETHForTokens",
    outputs: [
      { internalType: "uint256[]", name: "amounts", type: "uint256[]" },
    ],
    stateMutability: "payable",
    type: "function",
  },
  {
    inputs: [
      { internalType: "uint256", name: "amountIn", type: "uint256" },
      { internalType: "uint256", name: "amountOutMin", type: "uint256" },
      { internalType: "address[]", name: "path", type: "address[]" },
      { internalType: "address", name: "to", type: "address" },
      { internalType: "uint256", name: "deadline", type: "uint256" },
    ],
    name: "swapExactTokensForETH",
    outputs: [
      { internalType: "uint256[]", name: "amounts", type: "uint256[]" },
    ],
    stateMutability: "nonpayable",
    type: "function",
  },
  {
    inputs: [
      { internalType: "uint256", name: "amountIn", type: "uint256" },
      { internalType: "uint256", name: "amountOutMin", type: "uint256" },
      { internalType: "address[]", name: "path", type: "address[]" },
      { internalType: "address", name: "to", type: "address" },
      { internalType: "uint256", name: "deadline", type: "uint256" },
    ],
    name: "swapExactTokensForTokens",
    outputs: [
      { internalType: "uint256[]", name: "amounts", type: "uint256[]" },
    ],
    stateMutability: "nonpayable",
    type: "function",
  },
  {
    inputs: [
      { internalType: "uint256", name: "amountOut", type: "uint256" },
      { internalType: "uint256", name: "amountInMax", type: "uint256" },
      { internalType: "address[]", name: "path", type: "address[]" },
      { internalType: "address", name: "to", type: "address" },
      { internalType: "uint256", name: "deadline", type: "uint256" },
    ],
    name: "swapTokensForExactETH",
    outputs: [
      { internalType: "uint256[]", name: "amounts", type: "uint256[]" },
    ],
    stateMutability: "nonpayable",
    type: "function",
  },
  {
    inputs: [
      { internalType: "uint256", name: "amountOut", type: "uint256" },
      { internalType: "uint256", name: "amountInMax", type: "uint256" },
      { internalType: "address[]", name: "path", type: "address[]" },
      { internalType: "address", name: "to", type: "address" },
      { internalType: "uint256", name: "deadline", type: "uint256" },
    ],
    name: "swapTokensForExactTokens",
    outputs: [
      { internalType: "uint256[]", name: "amounts", type: "uint256[]" },
    ],
    stateMutability: "nonpayable",
    type: "function",
  },
];

        const stellaInterface = new ethers.utils.Interface(stellaSwapABI);

        const swapEncodedData = stellaInterface.encodeFunctionData(
          "swapExactETHForTokens",
          [
            ethers.BigNumber.from("0"), // not usable in production
            [
              tokenInputAddress,
              tokenOutputAddress,
            ],
            squidAddress,
            deadline,
          ]
        );

We are here encoding a valid Uniswap V2 pool swap data to be included in the post-hook on Moonbeam chain.