Install with pip install w3multicall

https://pypi.org/project/w3multicall/

Want to support this project ? You can help us by:

• Delegating AVAX to our Avalanche node NodeID-4btZGj8TmrycK22kwgBK5wJEFighAFWiZ
• Making a donation to 0xA68fBfa3E0c86D1f3fF071853df6DAe8753095E2

This software is derived from multicall.py. However, multicall.py is built on asyncio and does not support multi-threading. This implementation fixes that.

W3Multicall

Build and install locally

From the root folder w3multicall do pip install . to build and install the package in the current python environment

Multicall Smart Contract

Multicall smart contract are deployed on numerous chains and can help reduce the strain put on RPC by order of magnitude by batching multiple requests into a single one.

Simple Multicall

from web3 import Web3
from w3multicall.multicall import W3Multicall

w3 = Web3(Web3.HTTPProvider(rpc))

w3_multicall = W3Multicall(w3)

w3_multicall.add(W3Multicall.Call(
    '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48',  # USDC contract address
    'balanceOf(address)(uint256)',  # method signature to call
    '0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045')  # vitalik.eth
)

results = w3_multicall.call()

print("Vitalik holds {:.2f} USDC".format(results[0]/10**6))

See full example

Multithread Multicall

w3_pool = W3Pool([
        W3(Web3(Web3.HTTPProvider('https://eth-rpc.gateway.pokt.network')), 5),
        W3(Web3(Web3.HTTPProvider('https://ethereum.publicnode.com')), 5),
        W3(Web3(Web3.HTTPProvider('https://rpc.flashbots.net/')), 5)
    ], logger)

executor = W3MulticallExecutor(w3_pool, processes=len(w3_pool.w3s))

bayc_futures = []
azuki_futures = []
moonbird_futures = []
for i in range(1, 10):

    bayc_futures.append(executor.submit(W3Multicall.Call(
        '0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D',  # BAYC NFT contract address
        'ownerOf(uint256)(address)',
        i)))

    azuki_futures.append(executor.submit(W3Multicall.Call(
        '0xED5AF388653567Af2F388E6224dC7C4b3241C544',  # Azuki NFT contract address
        'ownerOf(uint256)(address)',
        i)))

    moonbird_futures.append(executor.submit(W3Multicall.Call(
        '0x23581767a106ae21c074b2276D25e5C3e136a68b',  # Moonbird NFT contract address
        'ownerOf(uint256)(address)',
        i)))        
    
for i in range(len(bayc_futures)):
    print("The owner of the BAYC Nº{} is {}".format(i + 1, bayc_futures[i].get()))

for i in range(len(azuki_futures)):
    print("The owner of the Azuki Nº{} is {}".format(i + 1, azuki_futures[i].get()))

for i in range(len(moonbird_futures)):
    print("The owner of the Moonbird Nº{} is {}".format(i + 1, moonbird_futures[i].get()))

See full example