Python Tutorial: Learn how to use the Uniswap Universal Router PERMIT2_PERMIT function and Permit2 contract to swap any ERC-20 tokens. Practise the Python SDK
This is the and ardently demanded tutorial about the contract and how to use it with the to swap or sell tokens. It is also the continuation of the introductory tutorial: . long-awaited Permit2 Uniswap Universal Router How to Buy a Token on the Uniswap Universal Router with Python A Bit of Context After , the standard way to allow a protocol to use your tokens was to it to the token contract and give it an , through a transaction.
We finished the introductory tutorial after buying some tokens, so we’ll start from there, and we’ll swap them for some . UNI USDT By the end of this tutorial, you will be able to create a transaction to some tokens from the latest Uniswap router with Python, using . sell Permit2 signature-based approvals Prerequisites This tutorial is intended for developers who are comfortable with Python, the basics of , and . Ethereum building transactions with web3.
Getting some UNI Tokens We’re going to re-use the script from the previous tutorial and append our new code to have a fully independent script to launch. Make sure the script works and gives you UNI. buy_token.py 368.41333521045374 Swapping tokens And now, the moment you've been waiting for: selling our UNI tokens using the Uniswap Universal Router and the Permit2 contract! Step 1: Approving the Permit2 contract to the UNI one This step is similar to the ERC-20 standard, .
permit_data signed_message. : at block , the price of UNI was around $4.19, so we gave a bit of room and asked for a minimum of 415 USDT for our 100 UNI. min_amount_out 17365005 b. Building and sending the transaction And the transaction is built and sent as usual: trx_params={ "from": account.address, "to": ur_address, "gas": 500_000, "maxPriorityFeePerGas": w3.eth.
function is the way to authorize the Uniswap Universal Router to swap any ERC-20 tokens, even if they don’t support ERC-2612. The great benefit, compared to the ERC-20 standard, is that you don’t have to approve each and every protocol to the USDT contract if they use the Permit2 contract as well. You just need to include a signed permit message in your transaction.
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