eth_call.js

const Web3 = require("web3");

const INFURA_PROJECT_ID = "<SECRET>";
const NODE_URL = `https://mainnet.infura.io/v3/${INFURA_PROJECT_ID}`;
const web3 = new Web3(NODE_URL);

const BancorNetworkInfoABI = [
    {
      "inputs": [
        {
          "internalType": "contract IBancorNetwork",
          "name": "initNetwork",
          "type": "address"
        },
        {
          "internalType": "contract ITokenGovernance",
          "name": "initBNTGovernance",
          "type": "address"
        },
        {
          "internalType": "contract ITokenGovernance",
          "name": "initVBNTGovernance",
          "type": "address"
        },
        {
          "internalType": "contract INetworkSettings",
          "name": "initNetworkSettings",
          "type": "address"
        },
        {
          "internalType": "contract IMasterVault",
          "name": "initMasterVault",
          "type": "address"
        },
        {
          "internalType": "contract IExternalProtectionVault",
          "name": "initExternalProtectionVault",
          "type": "address"
        },
        {
          "internalType": "contract IExternalRewardsVault",
          "name": "initExternalRewardsVault",
          "type": "address"
        },
        {
          "internalType": "contract IBNTPool",
          "name": "initBNTPool",
          "type": "address"
        },
        {
          "internalType": "contract IPendingWithdrawals",
          "name": "initPendingWithdrawals",
          "type": "address"
        },
        {
          "internalType": "contract IPoolMigrator",
          "name": "initPoolMigrator",
          "type": "address"
        }
      ],
      "stateMutability": "nonpayable",
      "type": "constructor"
    },
    { "inputs": [], "name": "AlreadyInitialized", "type": "error" },
    { "inputs": [], "name": "InvalidAddress", "type": "error" },
    { "inputs": [], "name": "InvalidParam", "type": "error" },
    { "inputs": [], "name": "InvalidToken", "type": "error" },
    { "inputs": [], "name": "ZeroValue", "type": "error" },
    {
      "anonymous": false,
      "inputs": [
        {
          "indexed": true,
          "internalType": "bytes32",
          "name": "role",
          "type": "bytes32"
        },
        {
          "indexed": true,
          "internalType": "bytes32",
          "name": "previousAdminRole",
          "type": "bytes32"
        },
        {
          "indexed": true,
          "internalType": "bytes32",
          "name": "newAdminRole",
          "type": "bytes32"
        }
      ],
      "name": "RoleAdminChanged",
      "type": "event"
    },
    {
      "anonymous": false,
      "inputs": [
        {
          "indexed": true,
          "internalType": "bytes32",
          "name": "role",
          "type": "bytes32"
        },
        {
          "indexed": true,
          "internalType": "address",
          "name": "account",
          "type": "address"
        },
        {
          "indexed": true,
          "internalType": "address",
          "name": "sender",
          "type": "address"
        }
      ],
      "name": "RoleGranted",
      "type": "event"
    },
    {
      "anonymous": false,
      "inputs": [
        {
          "indexed": true,
          "internalType": "bytes32",
          "name": "role",
          "type": "bytes32"
        },
        {
          "indexed": true,
          "internalType": "address",
          "name": "account",
          "type": "address"
        },
        {
          "indexed": true,
          "internalType": "address",
          "name": "sender",
          "type": "address"
        }
      ],
      "name": "RoleRevoked",
      "type": "event"
    },
    {
      "inputs": [],
      "name": "DEFAULT_ADMIN_ROLE",
      "outputs": [{ "internalType": "bytes32", "name": "", "type": "bytes32" }],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [],
      "name": "bnt",
      "outputs": [
        { "internalType": "contract IERC20", "name": "", "type": "address" }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [],
      "name": "bntGovernance",
      "outputs": [
        {
          "internalType": "contract ITokenGovernance",
          "name": "",
          "type": "address"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [],
      "name": "bntPool",
      "outputs": [
        { "internalType": "contract IBNTPool", "name": "", "type": "address" }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [
        { "internalType": "contract Token", "name": "pool", "type": "address" }
      ],
      "name": "depositingEnabled",
      "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [],
      "name": "externalProtectionVault",
      "outputs": [
        {
          "internalType": "contract IExternalProtectionVault",
          "name": "",
          "type": "address"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [],
      "name": "externalRewardsVault",
      "outputs": [
        {
          "internalType": "contract IExternalRewardsVault",
          "name": "",
          "type": "address"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [
        { "internalType": "bytes32", "name": "role", "type": "bytes32" }
      ],
      "name": "getRoleAdmin",
      "outputs": [{ "internalType": "bytes32", "name": "", "type": "bytes32" }],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [
        { "internalType": "bytes32", "name": "role", "type": "bytes32" },
        { "internalType": "uint256", "name": "index", "type": "uint256" }
      ],
      "name": "getRoleMember",
      "outputs": [{ "internalType": "address", "name": "", "type": "address" }],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [
        { "internalType": "bytes32", "name": "role", "type": "bytes32" }
      ],
      "name": "getRoleMemberCount",
      "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [
        { "internalType": "bytes32", "name": "role", "type": "bytes32" },
        { "internalType": "address", "name": "account", "type": "address" }
      ],
      "name": "grantRole",
      "outputs": [],
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "inputs": [
        { "internalType": "bytes32", "name": "role", "type": "bytes32" },
        { "internalType": "address", "name": "account", "type": "address" }
      ],
      "name": "hasRole",
      "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [],
      "name": "initialize",
      "outputs": [],
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "inputs": [
        { "internalType": "contract Token", "name": "pool", "type": "address" }
      ],
      "name": "isPoolStable",
      "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [{ "internalType": "uint256", "name": "id", "type": "uint256" }],
      "name": "isReadyForWithdrawal",
      "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [],
      "name": "masterVault",
      "outputs": [
        { "internalType": "contract IMasterVault", "name": "", "type": "address" }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [],
      "name": "network",
      "outputs": [
        {
          "internalType": "contract IBancorNetwork",
          "name": "",
          "type": "address"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [],
      "name": "networkSettings",
      "outputs": [
        {
          "internalType": "contract INetworkSettings",
          "name": "",
          "type": "address"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [],
      "name": "pendingWithdrawals",
      "outputs": [
        {
          "internalType": "contract IPendingWithdrawals",
          "name": "",
          "type": "address"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [],
      "name": "poolMigrator",
      "outputs": [
        {
          "internalType": "contract IPoolMigrator",
          "name": "",
          "type": "address"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [
        { "internalType": "contract Token", "name": "pool", "type": "address" }
      ],
      "name": "poolToken",
      "outputs": [
        { "internalType": "contract IPoolToken", "name": "", "type": "address" }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [
        { "internalType": "contract Token", "name": "pool", "type": "address" },
        {
          "internalType": "uint256",
          "name": "poolTokenAmount",
          "type": "uint256"
        }
      ],
      "name": "poolTokenToUnderlying",
      "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [{ "internalType": "bytes", "name": "data", "type": "bytes" }],
      "name": "postUpgrade",
      "outputs": [],
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "inputs": [
        { "internalType": "bytes32", "name": "role", "type": "bytes32" },
        { "internalType": "address", "name": "account", "type": "address" }
      ],
      "name": "renounceRole",
      "outputs": [],
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "inputs": [
        { "internalType": "bytes32", "name": "role", "type": "bytes32" },
        { "internalType": "address", "name": "account", "type": "address" }
      ],
      "name": "revokeRole",
      "outputs": [],
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "inputs": [],
      "name": "roleAdmin",
      "outputs": [{ "internalType": "bytes32", "name": "", "type": "bytes32" }],
      "stateMutability": "pure",
      "type": "function"
    },
    {
      "inputs": [
        { "internalType": "contract Token", "name": "pool", "type": "address" }
      ],
      "name": "stakedBalance",
      "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [
        { "internalType": "bytes4", "name": "interfaceId", "type": "bytes4" }
      ],
      "name": "supportsInterface",
      "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [
        {
          "internalType": "contract Token",
          "name": "sourceToken",
          "type": "address"
        },
        {
          "internalType": "contract Token",
          "name": "targetToken",
          "type": "address"
        },
        { "internalType": "uint256", "name": "targetAmount", "type": "uint256" }
      ],
      "name": "tradeInputByTargetAmount",
      "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [
        {
          "internalType": "contract Token",
          "name": "sourceToken",
          "type": "address"
        },
        {
          "internalType": "contract Token",
          "name": "targetToken",
          "type": "address"
        },
        { "internalType": "uint256", "name": "sourceAmount", "type": "uint256" }
      ],
      "name": "tradeOutputBySourceAmount",
      "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [
        { "internalType": "contract Token", "name": "pool", "type": "address" }
      ],
      "name": "tradingEnabled",
      "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [
        { "internalType": "contract Token", "name": "pool", "type": "address" }
      ],
      "name": "tradingFeePPM",
      "outputs": [{ "internalType": "uint32", "name": "", "type": "uint32" }],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [
        { "internalType": "contract Token", "name": "pool", "type": "address" }
      ],
      "name": "tradingLiquidity",
      "outputs": [
        {
          "components": [
            {
              "internalType": "uint128",
              "name": "bntTradingLiquidity",
              "type": "uint128"
            },
            {
              "internalType": "uint128",
              "name": "baseTokenTradingLiquidity",
              "type": "uint128"
            }
          ],
          "internalType": "struct TradingLiquidity",
          "name": "",
          "type": "tuple"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [
        { "internalType": "contract Token", "name": "pool", "type": "address" },
        { "internalType": "uint256", "name": "tokenAmount", "type": "uint256" }
      ],
      "name": "underlyingToPoolToken",
      "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [],
      "name": "vbnt",
      "outputs": [
        { "internalType": "contract IERC20", "name": "", "type": "address" }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [],
      "name": "vbntGovernance",
      "outputs": [
        {
          "internalType": "contract ITokenGovernance",
          "name": "",
          "type": "address"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [],
      "name": "version",
      "outputs": [{ "internalType": "uint16", "name": "", "type": "uint16" }],
      "stateMutability": "pure",
      "type": "function"
    },
    {
      "inputs": [
        { "internalType": "contract Token", "name": "pool", "type": "address" },
        {
          "internalType": "uint256",
          "name": "poolTokenAmount",
          "type": "uint256"
        }
      ],
      "name": "withdrawalAmounts",
      "outputs": [
        {
          "components": [
            {
              "internalType": "uint256",
              "name": "totalAmount",
              "type": "uint256"
            },
            {
              "internalType": "uint256",
              "name": "baseTokenAmount",
              "type": "uint256"
            },
            { "internalType": "uint256", "name": "bntAmount", "type": "uint256" }
          ],
          "internalType": "struct WithdrawalAmounts",
          "name": "",
          "type": "tuple"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    }
  ]

async function main() {
    const contract = new web3.eth.Contract(BancorNetworkInfoABI, '0x8E303D296851B320e6a697bAcB979d13c9D6E760')
    contract.methods.poolTokenToUnderlying('0x1f573d6fb3f13d689ff844b4ce37794d79a7ff1c', "83731643048837857095046712").call({}, 14949930).then(function (result){
        console.log(JSON.stringify(result))
    })
}

main()