> For the complete documentation index, see [llms.txt](https://docs.getblock.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.getblock.io/flashblocks/flashblocks-api/eth_getbalance-flashblocks.md).

# eth\_getBalance - Flashblocks

This returns the ETH balance of an address in wei. When called with `"pending"`, includes the effect of every transaction preconfirmed into the latest Flashblock — usually within 200ms (Base) or 250ms (Optimism) of the user's submission. Applications that update balance UIs on the `pending` tag give users near-instant feedback that a transfer has landed.

## Parameters

| Parameter | Type            | Required | Description      |
| --------- | --------------- | -------- | ---------------- |
| address   | DATA (20 bytes) | Yes      | Address to check |
| block     | QUANTITY        | TAG      | Yes              |

## Request Example

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

```bash
curl --location --request POST 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_getBalance",
    "params": [
        "0x7a25d0f0Ff6a25f36De0a19C3d5f6dC2C6EAeD6a",
        "pending"
    ],
    "id": "getblock.io"
}'
```

{% endtab %}

{% tab title="JavaScript (Axios)" %}

```javascript
import axios from 'axios';

const data = JSON.stringify({
    "jsonrpc": "2.0",
    "method": "eth_getBalance",
    "params": [
        "0x7a25d0f0Ff6a25f36De0a19C3d5f6dC2C6EAeD6a",
        "pending"
    ],
    "id": "getblock.io"
});

const config = {
    method: 'post',
    url: 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/',
    headers: {
        'Content-Type': 'application/json'
    },
    data: data
};

axios(config)
    .then(response => console.log(JSON.stringify(response.data, null, 2)))
    .catch(error => console.log(error));
```

{% endtab %}

{% tab title="Python (Requests)" %}

```python
import requests
import json

url = "https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/"

payload = json.dumps({
    "jsonrpc": "2.0",
    "method": "eth_getBalance",
    "params": [
        "0x7a25d0f0Ff6a25f36De0a19C3d5f6dC2C6EAeD6a",
        "pending"
    ],
    "id": "getblock.io"
})

headers = {
    'Content-Type': 'application/json'
}

response = requests.post(url, headers=headers, data=payload)
print(response.text)
```

{% endtab %}

{% tab title="Rust (Reqwest)" %}

```rust
use reqwest::Client;
use serde_json::json;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new();

    let payload = json!({
        "jsonrpc": "2.0",
        "method": "eth_getBalance",
        "params": [
                "0x7a25d0f0Ff6a25f36De0a19C3d5f6dC2C6EAeD6a",
                "pending"
        ],
        "id": "getblock.io"
});

    let response = client
        .post("https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&payload)
        .send()
        .await?;

    let result: serde_json::Value = response.json().await?;
    println!("{:#?}", result);

    Ok(())
}
```

{% endtab %}
{% endtabs %}

## Response Example

{% code overflow="wrap" %}

```json
{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": "0x1bc16d674ec80000"
}
```

{% endcode %}

## Response Parameters

| Field  | Type     | Description                                      |
| ------ | -------- | ------------------------------------------------ |
| result | QUANTITY | Balance in wei (hex). Divide by 10^18 to get ETH |

## Use Cases

* Wallet UIs showing near-instant balance updates after a transfer
* Payment applications confirming a payment has been received before block seal
* Trading bots that need to know current available balance including unsealed transfers

## Error Handling

| Status Code | Error Message     | Cause                                                                                                 |
| ----------- | ----------------- | ----------------------------------------------------------------------------------------------------- |
| 403         | Forbidden         | Missing or invalid `<ACCESS-TOKEN>`                                                                   |
| -32602      | Invalid params    | Request parameters are missing or malformed                                                           |
| -32601      | Method not found  | Method does not exist or is not enabled on this endpoint. Confirm your endpoint is Flashblocks-aware. |
| -32603      | Internal error    | Server-side error while processing the request                                                        |
| 429         | Too Many Requests | Rate limit exceeded for your plan                                                                     |
| -32602      | Invalid address   | Address is not a valid 20-byte hex string                                                             |

## SDK Integration

{% tabs %}
{% tab title="ethers.js" %}
{% code overflow="wrap" %}

```javascript
import { ethers } from 'ethers';

const provider = new ethers.JsonRpcProvider('https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/');

// Generic JSON-RPC call — 'pending' returns Flashblocks-preconfirmed state:
const result = await provider.send('eth_getBalance', ["0x7a25d0f0Ff6a25f36De0a19C3d5f6dC2C6EAeD6a", "pending"]);
console.log(result);

// Many standard methods have typed wrappers on ethers Provider that accept 'pending':
// provider.getBalance(addr, 'pending'), provider.getTransactionCount(addr, 'pending'), etc.
```

{% endcode %}
{% endtab %}

{% tab title="viem" %}

```javascript
import { createPublicClient, http } from 'viem';

const client = createPublicClient({
    transport: http('https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/')
});

// viem's read methods accept blockTag: 'pending' for Flashblocks-preconfirmed state:
const result = await client.request({
    method: 'eth_getBalance',
    params: ["0x7a25d0f0Ff6a25f36De0a19C3d5f6dC2C6EAeD6a", "pending"]
});
console.log(result);

// Typed wrappers also accept blockTag: 'pending':
// client.getBalance({ address, blockTag: 'pending' })
// client.getBlock({ blockTag: 'pending' })
```

{% endtab %}
{% endtabs %}