PoolCreated (Uniswap V3) event signature and topic0

import { createPublicClient, http, parseAbiItem } from "viem"
import { mainnet } from "viem/chains"

const client = createPublicClient({ chain: mainnet, transport: http() })

const logs = await client.getLogs({
  address: "0x1f98431c8ad98523631ae4a59f267346ea31f984",
  event: parseAbiItem("event PoolCreated(address indexed token0, address indexed token1, uint24 indexed fee, int24 tickSpacing, address pool)"),
  fromBlock: "latest",
})

for (const log of logs) console.log(log.args) // { token0, token1, fee, tickSpacing, pool }

import { Interface, JsonRpcProvider } from "ethers"

const provider = new JsonRpcProvider(process.env.RPC_URL)
const iface = new Interface(["event PoolCreated(address indexed token0, address indexed token1, uint24 indexed fee, int24 tickSpacing, address pool)"])

const logs = await provider.getLogs({
  address: "0x1f98431c8ad98523631ae4a59f267346ea31f984",
  topics: [iface.getEvent("PoolCreated")!.topicHash],
})

for (const log of logs) console.log(iface.parseLog(log)?.args)

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "eth_getLogs",
  "params": [
    {
      "address": "0x1f98431c8ad98523631ae4a59f267346ea31f984",
      "topics": [
        "0x783cca1c0412dd0d695e784568c96da2e9c22ff989357a2e8b1d9b2b4e6b7118"
      ],
      "fromBlock": "latest"
    }
  ]
}

event PoolCreated(address indexed token0, address indexed token1, uint24 indexed fee, int24 tickSpacing, address pool);

// inside a function:
emit PoolCreated(token0, token1, fee, tickSpacing, pool);