Borrow (Aave V2) 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: "0xYourContractAddress",
  event: parseAbiItem("event Borrow(address indexed reserve, address user, address indexed onBehalfOf, uint256 amount, uint256 borrowRateMode, uint256 borrowRate, uint16 indexed referral)"),
  fromBlock: "latest",
})

for (const log of logs) console.log(log.args) // { reserve, user, onBehalfOf, amount, borrowRateMode, borrowRate, referral }

import { Interface, JsonRpcProvider } from "ethers"

const provider = new JsonRpcProvider(process.env.RPC_URL)
const iface = new Interface(["event Borrow(address indexed reserve, address user, address indexed onBehalfOf, uint256 amount, uint256 borrowRateMode, uint256 borrowRate, uint16 indexed referral)"])

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

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

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "eth_getLogs",
  "params": [
    {
      "address": "0xYourContractAddress",
      "topics": [
        "0xc6a898309e823ee50bac64e45ca8adba6690e99e7841c45d754e2a38e9019d9b"
      ],
      "fromBlock": "latest"
    }
  ]
}

event Borrow(address indexed reserve, address user, address indexed onBehalfOf, uint256 amount, uint256 borrowRateMode, uint256 borrowRate, uint16 indexed referral);

// inside a function:
emit Borrow(reserve, user, onBehalfOf, amount, borrowRateMode, borrowRate, referral);