# eth\_feeHistory - Celo

This method returns historical gas information on the Celo network, enabling accurate fee estimation for EIP-1559 style transactions. Celo maintains extremely low fees, typically under $0.01 per transaction.

## Parameters

| Parameter         | Type   | Required | Description                             |
| ----------------- | ------ | -------- | --------------------------------------- |
| blockCount        | string | Yes      | Number of blocks to return (hex)        |
| newestBlock       | string | Yes      | Newest block ("latest" or block number) |
| rewardPercentiles | array  | No       | Percentile values for priority fees     |

## Request Example

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

```bash
curl -X POST https://go.getblock.io/<ACCESS-TOKEN>/ \
-H "Content-Type: application/json" \
-d '{
  "jsonrpc": "2.0",
  "id": "getblock.io",
  "method": "eth_feeHistory",
  "params": ["0x5", "latest", [25, 50, 75]]
}'
```

{% endtab %}

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

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

const url = 'https://go.getblock.io/<ACCESS-TOKEN>/';

const payload = {
  jsonrpc: '2.0',
  id: 'getblock.io',
  method: 'eth_feeHistory',
  params: ['0x5', 'latest', [25, 50, 75]]
};

axios.post(url, payload, {
  headers: { 'Content-Type': 'application/json' }
})
.then(response => console.log(response.data))
.catch(error => console.error(error));
```

{% endtab %}

{% tab title="Python" %}

```python
import requests
import json

url = "https://go.getblock.io/<ACCESS-TOKEN>/"

payload = {
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "method": "eth_feeHistory",
    "params": ["0x5", "latest", [25, 50, 75]]
}

response = requests.post(url, headers={"Content-Type": "application/json"}, json=payload)
print(response.json())
```

{% endtab %}
{% endtabs %}

## Response Example

```json
{
  "jsonrpc": "2.0",
  "id": "getblock.io",
  "result": {
    "baseFeePerGas": ["0x5d21dba00", "0x5d21dba00", "0x5d21dba00"],
    "gasUsedRatio": [0.021, 0.045, 0.032],
    "oldestBlock": "0x1d9f2a4",
    "reward": [["0x0", "0x0", "0x0"], ["0x0", "0x0", "0x0"]]
  }
}
```

## Reponse Definition

| Field         | Type   | Description                     |
| ------------- | ------ | ------------------------------- |
| baseFeePerGas | array  | Base fee per gas for each block |
| gasUsedRatio  | array  | Gas used ratio for each block   |
| oldestBlock   | string | Oldest block number returned    |
| reward        | array  | Priority fee percentiles        |

## Use Cases

* Calculate optimal gas prices
* Implement EIP-1559 fee estimation
* Analyze network congestion
* Build fee prediction models

## Error Handling

| Error Code | Description    |
| ---------- | -------------- |
| -32602     | Invalid params |
| -32603     | Internal error |

## SDK Integration

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

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

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

const feeData = await provider.getFeeData();
console.log('Max Fee:', ethers.formatGwei(feeData.maxFeePerGas));
console.log('Priority Fee:', ethers.formatGwei(feeData.maxPriorityFeePerGas));
```

{% 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/celo/eth_feehistory-celo.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.