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August 11, 2022 18:29
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This script will print the price of ETH in USDC on the Sushi Swap DEX on the polygon network
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| from web3 import Web3 | |
| infura_url = 'https://polygon-rpc.com' | |
| web3 = Web3(Web3.HTTPProvider(infura_url)) | |
| abi = [{"constant": True, "inputs": [], "name": "getReserves", | |
| "outputs": [{"internalType": "uint112", "name": "_reserve0", | |
| "type": "uint112"}, | |
| {"internalType": "uint112", "name": "_reserve1", | |
| "type": "uint112"}, {"internalType": "uint32", | |
| "name": "_blockTimestampLast", | |
| "type": "uint32"}], | |
| "payable": False, "stateMutability": "view", | |
| "type": "function"}] | |
| pool_address = Web3.toChecksumAddress('0x34965ba0ac2451a34a0471f04cca3f990b8dea27') | |
| liquidity_pool_contract = web3.eth.contract(address=pool_address, abi=abi) | |
| # Prices | |
| reserves = liquidity_pool_contract.functions.getReserves().call() | |
| usdc = reserves[0] * 10e-6 # according to https://polygonscan.com/address/0x2791bca1f2de4661ed88a30c99a7a9449aa84174#readProxyContract | |
| wraped_eth = reserves[1] * 10e-18 # according to https://polygonscan.com/address/0x7ceb23fd6bc0add59e62ac25578270cff1b9f619#readContract | |
| print(usdc / wraped_eth) |
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On line 23 - 24 I supported the decimals that each token is using, to get an accurate token price to be displayed.
I got the number of decimal places for each token in the comments to the right, this used polygon scan to read the contracts, and tell me the number of decimal places being used.