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Here is the outline of the article:
Testing the ETH Swap of Exact Tokens on Rink via the Uniswap Smart Contract
As part of my ongoing testing and learning process, I wanted to show you how to use the Etherscan platform to test different smart contract interactions. Today, I will be using the Rink by Uniswap smart contract to swap Link for WETH.
Step 1: Approve the Uniswap Smart Contract
First, I had to approve the Rink by Uniswap smart contract on Etherscan. To do this, I logged into my Etherscan account and went to the Uniswap contract page. So I clicked the “Approve” button next to the contract name.
Once the contract was approved, a transaction was made, which updated the contract balance accordingly.
Step 2: Calling the Swap Exact Tokens for ETH function
Next, I wanted to call the swapExactTokensForETH function from my Uniswap smart contract. This function allows me to swap a specified number of tokens (in this case Link) for a specified number of other tokens (WETH). To do this, I used the following Etherscan transaction:
0x... contract address ... 0xAaBcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYzZz...
Below is a detailed description of each part of the transaction:
contractAddress: address of my Rink by Uniswap smart contract
0xAaBcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYzZz...: Random 36-byte address (which I generated myself using a cryptocurrency wallet or a tool like MetaMask)
The swapExactTokensForETH function takes three parameters: the amount of the Link to swap to WETH, the WETH price in ETH per Link, and the transaction time frame. In this case, I set all three parameters to 1.
Note:
This transaction assumes that you have MetaMask installed on your Ethereum account and are logged into your wallet. If you are not using MetaMask, you will need to install it before making these transactions.
After creating the transaction, I ran it using a tool like Remix or Truffle to run it in my local network environment (since I do not have access to the Ethereum testnet on the blockchain).
Now I am waiting for the transaction to be processed and its results to be available on Etherscan. If all goes well, my Rink by Uniswap smart contract will be able to swap Link for WETH without any problems!