Event signature · Token standards

Deposit (wrap) event signature and topic0

The topic0 of the Deposit (wrap) event is 0xe1fffcc4923d04b559f4d29a8bfc6cda04eb5b0d3c460751c2402c5c5cc9109c, the keccak-256 hash of Deposit(address,uint256); 1 of its 2 arguments is indexed. ETH wrapped into an ERC-20 (e.g. WETH).

Anatomy of a Deposit (wrap) log

Topics

topic00xe1fffcc4923d04b559f4d29a8bfc6cda04eb5b0d3c460751c2402c5c5cc9109ckeccak256("Deposit(address,uint256)")
topic1dst (address)indexed: filterable

Data

datawad (uint256)ABI-encoded, decoded with the ABI

Parameters

Arguments and where they sit in the log

Indexed arguments travel as topics and can be filtered cheaply; the others are ABI-encoded together in the data.

Name	Type	In the log
dst	address	topic1
wad	uint256	data

Solidity declaration

event Deposit(address indexed dst, uint256 wad);

Canonical signature

Deposit(address,uint256)

topic0

0xe1fffcc4923d04b559f4d29a8bfc6cda04eb5b0d3c460751c2402c5c5cc9109c

Ready-made alerts

Get an alert on Deposit

Each rule opens with the contract and the conditions filled in. Sign in, pick your chat and click Create.

Ready-made rule · Wrapped Ether (WETH)Alert on every Deposit

Ready-made rule · Any contractAlert on Deposit from a contract you pick

Who emits it

Contracts we list that emit Deposit

Any other contract with the same signature emits a log with the same topic0.

Wrapped Ether (WETH)

0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2

Tracker: WETH alerts

Code

Read Deposit logs in code

The same filter in viem, ethers and plain JSON-RPC, and the Solidity that emits it. The address is Wrapped Ether (WETH), a contract we list that emits it.

viem

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

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

const logs = await client.getLogs({
  address: "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
  event: parseAbiItem("event Deposit(address indexed dst, uint256 wad)"),
  fromBlock: "latest",
})

for (const log of logs) console.log(log.args) // { dst, wad }

ethers v6

import { Interface, JsonRpcProvider } from "ethers"

const provider = new JsonRpcProvider(process.env.RPC_URL)
const iface = new Interface(["event Deposit(address indexed dst, uint256 wad)"])

const logs = await provider.getLogs({
  address: "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
  topics: [iface.getEvent("Deposit")!.topicHash],
})

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

JSON-RPC (eth_getLogs)

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "eth_getLogs",
  "params": [
    {
      "address": "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
      "topics": [
        "0xe1fffcc4923d04b559f4d29a8bfc6cda04eb5b0d3c460751c2402c5c5cc9109c"
      ],
      "fromBlock": "latest"
    }
  ]
}

Solidity

event Deposit(address indexed dst, uint256 wad);

// inside a function:
emit Deposit(dst, wad);

Example

An example Deposit log, encoded and decoded

Placeholder values, not a real transaction: how each argument is stored in the topics and the data, and what decoding gives back.

Encoded (as the node returns it)

topic0keccak256("Deposit(address,uint256)")0xe1fffcc4923d04b559f4d29a8bfc6cda04eb5b0d3c460751c2402c5c5cc9109c
topic1dst0x0000000000000000000000001111111111111111111111111111111111111111
data0x00000000000000000000000000000000000000000000000000000000000007d0

Decoded with the ABI

dstaddress · indexed0x1111111111111111111111111111111111111111
waduint2562000

FAQ

Frequently asked questions

What is the topic0 of the Deposit (wrap) event?

0xe1fffcc4923d04b559f4d29a8bfc6cda04eb5b0d3c460751c2402c5c5cc9109c: the keccak-256 hash of Deposit(address,uint256).

Which Deposit (wrap) arguments are indexed?

dst is indexed and sit in the log's topics; wad is in the data.

How do I get an alert when a contract emits Deposit (wrap)?

Open one of the ready-made rules on this page, or add any contract and pick Deposit (wrap) from the event list. Conditions can be set on indexed and non-indexed arguments, and each alert names the contract and links to the transaction.

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