eth_getLogs

Returns an array of all logs matching a given filter object on Cronos.

Why Cronos? Build on the EVM-compatible Crypto.com blockchain with fast finality and deep Crypto.com ecosystem integration.

Use Cases

The eth_getLogs method is essential for:

• Event indexing - Track contract events for DeFi protocols, NFT marketplaces, and Crypto.com ecosystem integrations
• Token transfers - Monitor ERC20/ERC721 transfers
• DeFi analytics - Track swaps, liquidity events, and more
• Notification systems - Alert on specific on-chain events

Cronos Rate Limits

Block Range Limit

On Cronos, eth_getLogs queries are subject to a maximum block range of 500 blocks. This means the difference between fromBlock and toBlock cannot exceed 500 blocks per request.

Additionally, each query can return a maximum of 10,000 log entries.

For querying larger block ranges, split your requests into smaller batches:

// Example: Query in 500-block batches
const BATCH_SIZE = 500;
let fromBlock = startBlock;

while (fromBlock <= endBlock) {
  const toBlock = Math.min(fromBlock + BATCH_SIZE - 1, endBlock);
  const logs = await provider.getLogs({ fromBlock, toBlock, ...filter });
  // Process logs
  fromBlock = toBlock + 1;
}

Parameters

Parameter	Type	Required	Description
fromBlock	QUANTITY|TAG	No	Starting block (default: "latest")
toBlock	QUANTITY|TAG	No	Ending block (default: "latest")
address	DATA|Array	No	Contract address(es) to filter
topics	Array	No	Array of topic filters
blockHash	DATA	No	Filter single block by hash

Request

{
  "jsonrpc": "2.0",
  "method": "eth_getLogs",
  "params": [{
    "fromBlock": "latest",
    "toBlock": "latest",
    "address": "0x5C7F8A570d578ED84E63fdFA7b1eE72dEae1AE23",
    "topics": ["0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"]
  }],
  "id": 1
}

Returns

Array of log objects:

Field	Type	Description
address	DATA	Contract that emitted the log
topics	Array	Array of indexed topics
data	DATA	Non-indexed log data
blockNumber	QUANTITY	Block number
transactionHash	DATA	Transaction hash
logIndex	QUANTITY	Log index in block

Response

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": [{
    "address": "0x5C7F8A570d578ED84E63fdFA7b1eE72dEae1AE23",
    "topics": ["0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef", "0x...", "0x..."],
    "data": "0x...",
    "blockNumber": "0x5BAD55",
    "transactionHash": "0x...",
    "logIndex": "0x0"
  }]
}

Code Examples

cURL

curl -X POST https://api-cronos-mainnet-archive.n.dwellir.com/YOUR_API_KEY \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getLogs",
    "params": [{
      "fromBlock": "latest",
      "toBlock": "latest",
      "address": "0x5C7F8A570d578ED84E63fdFA7b1eE72dEae1AE23",
      "topics": ["0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"]
    }],
    "id": 1
  }'

JavaScript

import { JsonRpcProvider, Contract } from 'ethers';

const provider = new JsonRpcProvider('https://api-cronos-mainnet-archive.n.dwellir.com/YOUR_API_KEY');

// Get Transfer events
const TRANSFER_TOPIC = '0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef';

async function getTransferEvents(tokenAddress, fromBlock, toBlock) {
  const logs = await provider.getLogs({
    address: tokenAddress,
    topics: [TRANSFER_TOPIC],
    fromBlock: fromBlock,
    toBlock: toBlock
  });

  return logs.map(log => ({
    from: '0x' + log.topics[1].slice(26),
    to: '0x' + log.topics[2].slice(26),
    blockNumber: log.blockNumber,
    transactionHash: log.transactionHash
  }));
}

const events = await getTransferEvents(
  '0x5C7F8A570d578ED84E63fdFA7b1eE72dEae1AE23',
  'latest',
  'latest'
);
console.log('Transfer events:', events);

Python

from web3 import Web3

w3 = Web3(Web3.HTTPProvider('https://api-cronos-mainnet-archive.n.dwellir.com/YOUR_API_KEY'))

TRANSFER_TOPIC = '0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef'

def get_transfer_events(token_address, from_block, to_block):
    logs = w3.eth.get_logs({
        'address': token_address,
        'topics': [TRANSFER_TOPIC],
        'fromBlock': from_block,
        'toBlock': to_block
    })

    events = []
    for log in logs:
        events.append({
            'from': '0x' + log['topics'][1].hex()[26:],
            'to': '0x' + log['topics'][2].hex()[26:],
            'block': log['blockNumber'],
            'tx': log['transactionHash'].hex()
        })

    return events

events = get_transfer_events(
    '0x5C7F8A570d578ED84E63fdFA7b1eE72dEae1AE23',
    'latest',
    'latest'
)
print(f'Found {len(events)} transfer events')

Go

package main

import (
    "context"
    "fmt"
    "log"
    "math/big"

    "github.com/ethereum/go-ethereum"
    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/ethclient"
)

func main() {
    client, err := ethclient.Dial("https://api-cronos-mainnet-archive.n.dwellir.com/YOUR_API_KEY")
    if err != nil {
        log.Fatal(err)
    }

    contractAddress := common.HexToAddress("0x5C7F8A570d578ED84E63fdFA7b1eE72dEae1AE23")
    transferTopic := common.HexToHash("0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef")

    query := ethereum.FilterQuery{
        FromBlock: big.NewInt(0),
        ToBlock:   nil,
        Addresses: []common.Address{contractAddress},
        Topics:    [][]common.Hash,
    }

    logs, err := client.FilterLogs(context.Background(), query)
    if err != nil {
        log.Fatal(err)
    }

    fmt.Printf("Found %d events\n", len(logs))
}

Error Handling

Error Code	Message	Description
-32005	Query returned more than 10000 results	Reduce block range
-32602	Invalid params	Invalid filter parameters

Related Methods

• eth_newFilter - Create a filter for logs
• eth_getFilterChanges - Poll filter for new logs