CRYPTOCURRENCY

Ethereum: How to use Uniswap’s Universal Router without Permit2?

Posted on by chang mr.

Using the Permissionless Uniswap Universal Router 2: A Guide to Web3.py

As a developer using Web3.py and a hosted Geth node account, you are probably aware of the importance of securely managing 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 Geth node without requiring direct access to your private key or a 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

  • Configure the Universal Router:

Uniswap provides an easy way to configure 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 your actual Geth node private key and “..." with the universal router address.

  • Create a Web3 provider:

To use the Uniswap universal router, you will need to create a web3 provider that can connect to your Geth node.

Here is an example of using the eth-apislibrary:

from eth import client as EthClient





Create a new client instance with your private key 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(func):
result = func()
return result
@execute_function
def my_uniswap_function():

Call the Uniswap function here
pass

  • Call the function using the Uniswap universal router

    Ethereum: How to use Uniswap's Universal Router without Permit2?

    :

Now that you have created the provider web3 and executed its function using the Uniswap router, you can call it directly without revealing any sensitive information about your private key or Permit2 signature.

Remember to replace ` with the actual private key of your Geth node. With this setup, you should be able to execute smart contract functions on behalf of your hosted Geth node account 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 deploying smart contracts on the Ethereum network.

chang mr.