Using the Uniswap Universal Router Without Permission2: A Guide to Web3.py

As a developer using Web3.py and an account hosted by a Geth node, you are probably aware of the importance of securely managing your private keys. However, when it comes to implementing smart contracts on the Ethereum blockchain, there are certain requirements that must be met to avoid security risks and ensure cross-platform compatibility.

What is Permit2?

Permit2 is a mechanism provided by the Ethereum Foundation that allows developers to sign transactions using a single private key without revealing sensitive information about their wallet or account. This feature was introduced in 2017 as an alternative to the traditional public key signing scheme used on the Ethereum network.

Permit2 Signature Generation Issue

Unfortunately, Web3.py does not support generating Permit2 signatures out of the box. According to the Ethereum documentation, Permit2 is currently only supported by decentralized application (dApp) wallets that use the Web3.js library and are configured to use a private key to sign transactions.

Using the Uniswap Universal Router

Fortunately, there is an alternative solution: using the Uniswap Universal Router. The Universal Router allows you to perform smart contract functions on behalf of your node. Get the private key without having to directly access your key or permit2 signature.

To get started with the Uniswap Universal Router, follow these steps:

• Install the Uniswap library

  : First, install the Uniswap library for Python using pip:

pip install uniswap

Uniswap offers an easy way to set up the Universal Router. You can do this by creating aconfig.jsonfile with your node's private key and other configuration details.

Here is an example of aconfig.jsonfile for an account hosted by a Geth node:

{
"node": {
"host": "
"port": 8545,
"privateKey": ""
},
"uniswapRouterAddress": "0x... Universal router address..."
}

Replace with the actual private key of the Geth node and…with the universal router address.

Here is an example of using theeth-apislibrary:

from eth import client as EthClient

Create a new client instance using your key. private and other configuration details
client = EthClient(config={"node": " "port": 8545, "privateKey": ""})

Get an instance of the Uniswap router
uniswap_router = client.uniswap()

Execute the function using the universal router
def execute_function(function):
result = function()
return result
@execute_function
def my_uniswap_function():

Call the Uniswap function here
pasha

Remember to replace ` with your private key. an actual private Geth node. With this setup, you should be able to execute smart contract functions on behalf of your account. hosted by a Geth node using the Uniswap universal router without generating a Permit2 signature.

Please note that this is an example implementation and may require further modifications to suit your specific use case. Be sure to read the Ethereum documentation and other resources for more information on implementing smart contracts on the Ethereum network.