Event listener
This script will listen to transfer events from the USDT token contract. The token address can be replaced with another contract address for listening to events that are emitted from a deployed contract on the Ethereum blockchain.
You will need the following:
- Token Contract Address
- Web Socket provider
- Endpoint API Key (e.g. Infura, Alchemy)
- Contract ABI
NOTE: It is recommended to use the dotenv library to mask your API Key as an environment variable. If not, then the API Key will be exposed if the source is in a public repository.
==================
This project was developed using the Hardhat development environment with NodeJS and the Ethers.js library.
To get started, you need to create a root folder for this project, then clone this repository to your local computer.
Then, from the root folder, run:
npm install
To run the listener, open the file 'listenToTether.js' using node.
node listenToTether.js
================== Here is the example of output from running the script:
"from": "0x835005BE4BEEFdEF34Da8697fa1482409210668b", "to": "0x4ed1f0C43B428Ae46460a10E5a7fB2CbA161b2F4", "value": "100.0", "data": { "blockNumber": 16940350, "blockHash": "0xc1ff75ab5addee4f9d192dacad0cb96b96857b0130c10cbd8948c9ff720580c3", "transactionIndex": 141, "removed": false, "address": "0xdAC17F958D2ee523a2206206994597C13D831ec7", "data": "0x0000000000000000000000000000000000000000000000000000000005f5e100", "topics": [ "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef", "0x000000000000000000000000835005be4beefdef34da8697fa1482409210668b", "0x0000000000000000000000004ed1f0c43b428ae46460a10e5a7fb2cba161b2f4" ], "transactionHash": "0xcdccc06f13f0f300e6072694571c5853fdbbc6e829c16c43715e3a6a673c7c7f", "logIndex": 300, "event": "Transfer", "eventSignature": "Transfer(address,address,uint256)", "args": [ "0x835005BE4BEEFdEF34Da8697fa1482409210668b", "0x4ed1f0C43B428Ae46460a10E5a7fB2CbA161b2F4", { "type": "BigNumber", "hex": "0x05f5e100" } ] }
The output returns data from the blockchain of 'Transfer' events. You can also find this information from the Etherscan explorer.
https://etherscan.io/address/0xdac17f958d2ee523a2206206994597c13d831ec7
Look under Events -> Transfer.
==================
NOTE: There is an 'abis' folder in the root of the project. The abi file was placed here. You can add your abi file here as well, or choose another folder location.