# eth\_getLogs - Base

The `eth_getLogs` method returns an array of all logs matching a given filter object. This is the primary method for querying event logs from smart contracts, essential for tracking token transfers, DEX swaps, and other on-chain events.

## Parameters

| Parameter    | Type   | Required | Description           |
| ------------ | ------ | -------- | --------------------- |
| filterObject | object | Yes      | Filter options object |

### Filter Object

| Field     | Type         | Required | Description                                            |
| --------- | ------------ | -------- | ------------------------------------------------------ |
| fromBlock | string       | No       | Start block number (hex) or "latest", "earliest"       |
| toBlock   | string       | No       | End block number (hex) or "latest", "earliest"         |
| address   | string/array | No       | Contract address or array of addresses                 |
| topics    | array        | No       | Array of topic filters (up to 4 topics)                |
| blockHash | string       | No       | Specific block hash (alternative to fromBlock/toBlock) |

## Request

{% tabs %}
{% tab title="cURL" %}

```bash
curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_getLogs",
    "params": [{
        "fromBlock": "0x12d6800",
        "toBlock": "0x12d6900",
        "address": "0x4200000000000000000000000000000000000006",
        "topics": ["0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"]
    }],
    "id": "getblock.io"
}'
```

{% endtab %}

{% tab title="Axios" %}

```javascript
const axios = require('axios');

// Query ERC-20 Transfer events
const transferTopic = '0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef';

const response = await axios.post('https://go.getblock.io/<ACCESS-TOKEN>/', {
    jsonrpc: '2.0',
    method: 'eth_getLogs',
    params: [{
        fromBlock: '0x12d6800',
        toBlock: '0x12d6900',
        address: '0x4200000000000000000000000000000000000006', // WETH
        topics: [transferTopic]
    }],
    id: 'getblock.io'
}, {
    headers: { 'Content-Type': 'application/json' }
});

const logs = response.data.result;
console.log('Found', logs.length, 'transfer events');
logs.forEach(log => {
    console.log('Block:', parseInt(log.blockNumber, 16));
    console.log('Tx:', log.transactionHash);
});
```

{% endtab %}

{% tab title="Request" %}

```python
import requests

# ERC-20 Transfer event signature
transfer_topic = '0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef'

response = requests.post(
    'https://go.getblock.io/<ACCESS-TOKEN>/',
    headers={'Content-Type': 'application/json'},
    json={
        'jsonrpc': '2.0',
        'method': 'eth_getLogs',
        'params': [{
            'fromBlock': '0x12d6800',
            'toBlock': '0x12d6900',
            'address': '0x4200000000000000000000000000000000000006',
            'topics': [transfer_topic]
        }],
        'id': 'getblock.io'
    }
)

result = response.json()
logs = result['result']
print(f'Found {len(logs)} transfer events')
for log in logs:
    print(f'Block: {int(log["blockNumber"], 16)}')
```

{% endtab %}

{% tab title="Rust" %}

```rust
use reqwest::Client;
use serde_json::{json, Value};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new();
    
    let response = client
        .post("https://go.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&json!({
            "jsonrpc": "2.0",
            "method": "eth_getLogs",
            "params": [{
                "fromBlock": "0x12d6800",
                "toBlock": "0x12d6900",
                "address": "0x4200000000000000000000000000000000000006",
                "topics": ["0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"]
            }],
            "id": "getblock.io"
        }))
        .send()
        .await?
        .json::<Value>()
        .await?;
    
    let logs = response["result"].as_array().unwrap();
    println!("Found {} logs", logs.len());
    Ok(())
}
```

{% endtab %}
{% endtabs %}

## Response

```json
{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": [
        {
            "address": "0x4200000000000000000000000000000000000006",
            "topics": [
                "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
                "0x000000000000000000000000sender_address_padded",
                "0x000000000000000000000000recipient_address_padded"
            ],
            "data": "0x0000000000000000000000000000000000000000000000000de0b6b3a7640000",
            "blockNumber": "0x12d6850",
            "transactionHash": "0x...",
            "transactionIndex": "0x0",
            "blockHash": "0x...",
            "logIndex": "0x0",
            "removed": false
        }
    ]
}
```

## Response Parameters

| Parameter        | Type    | Description                                |
| ---------------- | ------- | ------------------------------------------ |
| address          | string  | Contract address that emitted the log      |
| topics           | array   | Indexed event parameters (up to 4)         |
| data             | string  | Non-indexed event data (hex)               |
| blockNumber      | string  | Block number in hex                        |
| transactionHash  | string  | Transaction hash                           |
| transactionIndex | string  | Transaction index in block (hex)           |
| blockHash        | string  | Block hash                                 |
| logIndex         | string  | Log index in block (hex)                   |
| removed          | boolean | True if log was removed due to chain reorg |

## Use Cases

* Token Transfer Tracking: Monitor ERC-20/ERC-721 transfers
* DEX Event Processing: Track swaps, liquidity events
* Contract Event Indexing: Build event-driven databases
* Real-time Notifications: Alert on specific events
* Historical Analysis: Analyze past contract activity

## Error Handling

| Error Code | Message                        | Description                           |
| ---------- | ------------------------------ | ------------------------------------- |
| -32602     | Invalid params                 | Invalid filter object                 |
| -32603     | Internal error                 | Query range too large or node failure |
| -32005     | Query returned more than limit | Too many logs in response             |

## Web3 Integration

{% tabs %}
{% tab title="Ethers.js" %}

```javascript
const { ethers } = require('ethers');

const provider = new ethers.JsonRpcProvider('https://go.getblock.io/<ACCESS-TOKEN>/');

async function getLogs() {
    // Using filter
    const filter = {
        address: '0x4200000000000000000000000000000000000006', // WETH
        topics: [
            ethers.id('Transfer(address,address,uint256)')
        ],
        fromBlock: 'latest',
        toBlock: 'latest'
    };
    
    const logs = await provider.getLogs(filter);
    
    logs.forEach(log => {
        console.log('Block:', log.blockNumber);
        console.log('Tx:', log.transactionHash);
        console.log('Data:', log.data);
    });
    
    return logs;
}

// Using Contract interface for parsed events
async function getTransferEvents() {
    const abi = ['event Transfer(address indexed from, address indexed to, uint256 value)'];
    const contract = new ethers.Contract(
        '0x4200000000000000000000000000000000000006',
        abi,
        provider
    );
    
    const filter = contract.filters.Transfer();
    const events = await contract.queryFilter(filter, -100, 'latest');
    
    events.forEach(event => {
        console.log('From:', event.args.from);
        console.log('To:', event.args.to);
        console.log('Value:', ethers.formatEther(event.args.value));
    });
    
    return events;
}

getLogs();
```

{% endtab %}

{% tab title="Viem" %}

```javascript
import { createPublicClient, http, parseAbiItem } from 'viem';
import { base } from 'viem/chains';

const client = createPublicClient({
    chain: base,
    transport: http('https://go.getblock.io/<ACCESS-TOKEN>/')
});

async function getLogs() {
    const logs = await client.getLogs({
        address: '0x4200000000000000000000000000000000000006',
        event: parseAbiItem('event Transfer(address indexed from, address indexed to, uint256 value)'),
        fromBlock: BigInt(19800000),
        toBlock: 'latest'
    });
    
    logs.forEach(log => {
        console.log('From:', log.args.from);
        console.log('To:', log.args.to);
        console.log('Value:', log.args.value);
    });
    
    return logs;
}

// Watch for new logs
async function watchLogs() {
    const unwatch = client.watchEvent({
        address: '0x4200000000000000000000000000000000000006',
        event: parseAbiItem('event Transfer(address indexed from, address indexed to, uint256 value)'),
        onLogs: logs => {
            logs.forEach(log => {
                console.log('New Transfer:', log.args);
            });
        }
    });
    
    return unwatch;
}

getLogs();
```

{% endtab %}
{% endtabs %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.getblock.io/api-reference/base/eth_getlogs-base.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.