dex-provider/examples/dex.js

Fetch data like trading pair and liquidity from DEX

const {Dex, UniswapV2Extension, EvmChain} = require('../dist/index.js')

async function main() {
  const Ethereum = new EvmChain(
    'Ethereum',
    'https://mainnet.infura.io/v3/6d61e7957c1c489ea8141e947447405b',
    {
      id: '0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2',
      name: 'Wrapped Ether',
      symbol: 'WETH',
      decimals: 18,
    },
    {
      id: '0xdac17f958d2ee523a2206206994597c13d831ec7',
      name: 'Tether USD',
      symbol: 'USDT',
      decimals: 6,
    }
  )

  const Moonbeam = new EvmChain(
    'Moonbeam',
    'https://rpc.api.moonbeam.network',
    {
      id: '0xacc15dc74880c9944775448304b263d191c6077f',
      name: 'Wrapped GLMR',
      symbol: 'WGLMR',
      decimals: 18,
    },
    {
      id: '0x818ec0a7fe18ff94269904fced6ae3dae6d6dc0b',
      name: 'USD Coin',
      symbol: 'USDC',
      decimals: 6,
    }
  )

  // Create Uniswrap instance
  let uniSwap = new Dex(
    'UniSwapV2',
    Ethereum,
    '0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f',
    new UniswapV2Extension(
      Ethereum,
      'https://api.thegraph.com/subgraphs/name/uniswap/uniswap-v2'
    )
  )
  await uniSwap.initialize()

  console.log(
    `Pairs on UniswapV2: ${JSON.stringify(uniSwap.getPairs(), null, 2)}`
  )
  let usdtPairs = uniSwap.getTokenPairs({
    id: '0xdac17f958d2ee523a2206206994597c13d831ec7',
    name: 'Tether USD',
    symbol: 'USDT',
    decimals: 6,
  })
  console.log(
    `Pairs on UniswapV2 contain USDT: ${JSON.stringify(usdtPairs, null, 2)}`
  )

  // We know we got PHA trading pair in advance
  let phaPairs = uniSwap.getTokenPairs({
    id: '0x6c5ba91642f10282b576d91922ae6448c9d52f4e',
    name: 'Phala',
    symbol: 'PHA',
    decimals: 18,
  })
  console.log(
    `Capacity of first PHA-WETH pair: ${JSON.stringify(
      phaPairs[0],
      null,
      2
    )}, result is: ${uniSwap.getCapcities(phaPairs[0])}`
  )

  // Create StellaSwap instance
  let stellaSwap = new Dex(
    'StellaSwap',
    Moonbeam,
    '0x68A384D826D3678f78BB9FB1533c7E9577dACc0E',
    new UniswapV2Extension(
      Moonbeam,
      'https://api.thegraph.com/subgraphs/name/stellaswap/stella-swap'
    )
  )
  await stellaSwap.initialize()
  //   console.log(
  //     `Pairs on StellaSwap: ${JSON.stringify(stellaSwap.getPairs(), null, 2)}`
  //   )
  console.log(
    `Pairs on StellaSwap contain USDC: ${JSON.stringify(
      stellaSwap.getTokenPairs({
        id: '0x818ec0a7fe18ff94269904fced6ae3dae6d6dc0b',
        name: 'USD Coin',
        symbol: 'USDC',
        decimals: 6,
      }),
      null,
      2
    )}`
  )

  // Create BeamSwap instance
  let beamSwap = new Dex(
    'BeamSwap',
    Moonbeam,
    '0x985bca32293a7a496300a48081947321177a86fd',
    new UniswapV2Extension(
      Moonbeam,
      'https://api.thegraph.com/subgraphs/name/beamswap/beamswap-dex'
    )
  )
  await beamSwap.initialize()
  //   console.log(
  //     `Pairs on BeamSwap: ${JSON.stringify(beamSwap.getPairs(), null, 2)}`
  //   )
  console.log(
    `Pairs on BeamSwap contain USDC: ${JSON.stringify(
      beamSwap.getTokenPairs({
        id: '0x818ec0a7fe18ff94269904fced6ae3dae6d6dc0b',
        name: 'USD Coin',
        symbol: 'USDC',
        decimals: 6,
      }),
      null,
      2
    )}`
  )

  console.log(
    `Dump to beam info to JSON: ${JSON.stringify(beamSwap.toJSON(), null, 2)}`
  )
}

main()
  .catch(console.error)
  .finally(() => process.exit())