> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.galleon8.com/api-reference/node-api/ethereum/api-endpoints/standard-api/eth-fee-history/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.galleon8.com/_mcp/server.

# eth_feeHistory

POST https://node-api-docs-proxy.galleon8.workers.dev
Content-Type: application/json

Returns transaction base fee per gas and effective priority fee per gas for the requested/supported block range.

Reference: https://docs.galleon8.com/api-reference/node-api/ethereum/api-endpoints/standard-api/eth-fee-history

## Request

### Body (application/json)

This endpoint expects an object.

- `blockCount` (string, required) — Number of blocks in the requested fee history.
- `newestBlock` (any, required) — Newest block number or tag for the fee history range.
- `rewardPercentiles` (list of double, optional) — Optional priority fee percentiles to sample for each block.

## Response

### 200

Historical fee data for the requested block range.

- `oldestBlock` (string, required) — Hex-encoded integer quantity.
- `baseFeePerGas` (list of string, required)
- `gasUsedRatio` (list of double, required)
- `reward` (list of list of string, optional)

## Examples

**Request**

```json
[
  "0x4",
  "latest",
  [
    10,
    50,
    90
  ]
]
```

**Response**

```json
{
  "jsonrpc": "2.0",
  "id": "1",
  "result": {
    "oldestBlock": "0x10d4c",
    "baseFeePerGas": [
      "0x3b9aca00",
      "0x3c6bf526",
      "0x3d2f31ac",
      "0x3e1d2c80",
      "0x3f0f4a40"
    ],
    "gasUsedRatio": [
      0.42,
      0.55,
      0.61,
      0.49
    ],
    "reward": [
      [
        "0x77359400",
        "0x9502f900",
        "0xb2d05e00"
      ],
      [
        "0x77359400",
        "0x9502f900",
        "0xb2d05e00"
      ],
      [
        "0x77359400",
        "0x9502f900",
        "0xb2d05e00"
      ],
      [
        "0x77359400",
        "0x9502f900",
        "0xb2d05e00"
      ]
    ]
  }
}
```

**SDK Code**

```python
import requests

url = "https://node-api-docs-proxy.galleon8.workers.dev/"

payload = ["0x4", "latest", [10, 50, 90]]
headers = {"Content-Type": "application/json"}

response = requests.post(url, json=payload, headers=headers)

print(response.json())
```

```javascript
const url = 'https://node-api-docs-proxy.galleon8.workers.dev/';
const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: '["0x4","latest",[10,50,90]]'
};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://node-api-docs-proxy.galleon8.workers.dev/"

	payload := strings.NewReader("[\n  \"0x4\",\n  \"latest\",\n  [\n    10,\n    50,\n    90\n  ]\n]")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
```

```ruby
require 'uri'
require 'net/http'

url = URI("https://node-api-docs-proxy.galleon8.workers.dev/")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "[\n  \"0x4\",\n  \"latest\",\n  [\n    10,\n    50,\n    90\n  ]\n]"

response = http.request(request)
puts response.read_body
```

```java
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.post("https://node-api-docs-proxy.galleon8.workers.dev/")
  .header("Content-Type", "application/json")
  .body("[\n  \"0x4\",\n  \"latest\",\n  [\n    10,\n    50,\n    90\n  ]\n]")
  .asString();
```

```php
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://node-api-docs-proxy.galleon8.workers.dev/', [
  'body' => '[
  "0x4",
  "latest",
  [
    10,
    50,
    90
  ]
]',
  'headers' => [
    'Content-Type' => 'application/json',
  ],
]);

echo $response->getBody();
```

```csharp
using RestSharp;

var client = new RestClient("https://node-api-docs-proxy.galleon8.workers.dev/");
var request = new RestRequest(Method.POST);
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "[\n  \"0x4\",\n  \"latest\",\n  [\n    10,\n    50,\n    90\n  ]\n]", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = ["Content-Type": "application/json"]
let parameters = ["0x4", "latest", [10, 50, 90]] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://node-api-docs-proxy.galleon8.workers.dev/")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```