Web3.js

async loadBlockchainData() {
    const web3 = window.web3
       var instaKyberABI = { // compound connnector mint/deposit ABI
      constant: false,
      inputs: [
        {
          name: "src",
          type: "address"
        },
        {
          name: "dest",
          type: "address"
        },
        {
          name: "srcAmt",
          type: "uint"
        },
        {
          name: "maxDestAmt",
          type: "uint"
        },
        {
          name: "slippageRate",
          type: "uint"
        }
      ],
      name: "buy",
      outputs: [
        {
          name: "destAmt",
          type: "uint"
        }
      ],
      payable: true,
      stateMutability: "payable",
      type: "function"
    };
    var args = [
      '0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee',
      '0xDb0040451F373949A4Be60dcd7b6B8D6E42658B6',
      "100000000000000000",
      "1000000000000000000000",
      1 // Amount you want to deposit in wei 
  ]
    const data = await web3.eth.abi.encodeFunctionCall(instaKyberABI, args)
    console.log(data)
}