Ethers.js - Swap Event Listener - No Data Returned - ethereum

Question

I am trying to set up an event listener for "Swap" events on BSC. I have followed the example on the Ethers docs, but I am not recieving any information back even though there are swap events being emitted (confirmed on BSCScan).
Can you tell me if I am doing something wrong?
const { ethers } = require("ethers");
const provider = new ethers.providers.JsonRpcProvider('https://bsc-dataseed1.binance.org')
const address = '0x16b9a82891338f9bA80E2D6970FddA79D1eb0daE' // BNB/USDT pair
const pairABI = [
"function name() view returns (string)",
"event Swap(address indexed sender, uint256 amount0In, uint256 amount1In, uint256 amount0Out, uint256 amount1Out, address indexed to)"
];
const contract = new ethers.Contract(address, pairABI, provider)
const main = async () => {
const name = await contract.name()
console.log(`\nListening for swap events for ${name}\n`)
// Receive an event when ANY swap occurs
contract.on("Swap", (sender, amount0In, amount1In, amount0Out, amount1Out, to, event) => {
console.log(sender);
});
}
main()
I've followed the example on the Ethers.js guidance docs and also looked at a bunch of other examples and I seem to be doing the right thing, but getting nowhere.

Answer 1

You need to use a web socket provider, like so:
const provider = new ethers.providers.WebSocketProvider("wss://...");
Check official doc - https://docs.ethers.org/v5/api/providers/other/#WebSocketProvider