> ## Documentation Index > Fetch the complete documentation index at: https://docs.cryptoquant.com/llms.txt > Use this file to discover all available pages before exploring further. # Base Fee > The base fee per gas — the portion of the fee that is burnt rather than paid to the block producer, introduced by the London upgrade. ## What it measures The base fee per gas — the portion of the fee that is burnt rather than paid to the block producer, introduced by the London upgrade. Reported as the mean over the blocks in the window, in Gwei. ## Assets and windows | Asset class | What it covers | Assets | Windows | | - | - | - | - | | **Native ETH** | the native asset, `asset=eth` | `eth` | `block` · `10min` · `hour` · `day` | The default window is `day`. ## Response fields The time key depends on the window: `datetime` for `day`, `10min`, and `hour` and `blockheight` plus `datetime` for `block`. | Field | Type | Description | | - | - | - | | `base_fee_mean` | number | The mean base fee per gas over the blocks in the window, in Gwei. | ## OpenAPI ````yaml openapi/v2-onchain.json GET /network/base-fee openapi: 3.0.0 info: version: 2.0.0-beta title: CryptoQuant Data API v2 — On-chain description: >- On-chain endpoints of the CryptoQuant Data API v2 — network activity, exchange and mining pool flows, indicators, and capitalization, for Bitcoin and for Ethereum with the ERC-20 and stablecoin assets issued on it. One path serves every asset: the asset is a query parameter, not part of the path. Built on the v1 conventions: the `status`/`result` envelope, Bearer token authentication, and the `window`/`from`/`to` time parameters. termsOfService: https://cryptoquant.com/terms-of-service contact: name: API Support email: contact@cryptoquant.com servers: - url: https://api.cryptoquant.com/v2 description: Default server security: [] tags: - name: Network Data - name: Exchange Flows - name: Mining Pool Flows - name: Inter-Entity Flows - name: Indicator - name: Market Data paths: /network/base-fee: get: tags: - Network Data summary: Base Fee description: >- The base fee per gas — the portion of the fee that is burnt rather than paid to the block producer, introduced by the London upgrade. Reported as the mean over the blocks in the window, in Gwei. operationId: V2NetworkBaseFee parameters: - name: asset in: query required: true description: >- Asset to query, by its CryptoQuant alias (no chain suffix — `usdt`, not `usdt_eth`). 1 asset is available on this endpoint, across the asset class `eth`. Enumerate them with `/v2/discovery/endpoints`. schema: type: string example: eth - name: chain in: query required: false description: >- Chain the asset lives on. Optional for an asset that exists on exactly one chain, required when the same alias exists on several. schema: type: string enum: - ethereum - name: window in: query required: false description: >- Aggregation window. Which windows are valid depends on the asset — see the endpoint page. Defaults to `day`. schema: type: string enum: - block - 10min - hour - day default: day - name: from in: query required: false description: >- Inclusive start time, `YYYYMMDDTHHMMSS` (UTC). If `window=day`, `YYYYMMDD` is also accepted. schema: type: string - name: to in: query required: false description: >- Inclusive end time, `YYYYMMDDTHHMMSS` (UTC). If `window=day`, `YYYYMMDD` is also accepted. schema: type: string - name: limit in: query required: false description: Maximum rows returned (default 100, max 10000). schema: type: integer default: 100 maximum: 10000 - name: format in: query required: false description: 'Response format: `json` (default) or `csv`.' schema: type: string enum: - json - csv default: json responses: '200': description: Base Fee time-series. content: application/json: schema: type: object required: - status - result properties: status: $ref: '#/components/schemas/Status' result: type: object properties: window: type: string data: type: array items: type: object properties: datetime: type: string description: >- Interval start, `YYYY-MM-DD HH:MM:SS` (UTC). Present for every window. base_fee_mean: type: number description: >- The mean base fee per gas over the blocks in the window, in Gwei. blockheight: type: integer description: >- Block height. Present only when `window` is `block`. security: - AccessToken: [] x-codeSamples: - lang: Shell source: >- curl -X GET "https://api.cryptoquant.com/v2/network/base-fee?asset=eth&window=day" \ -H "Authorization: Bearer " - lang: JavaScript source: >- fetch("https://api.cryptoquant.com/v2/network/base-fee?asset=eth&window=day", { headers: { "Authorization": "Bearer "} }) .then(response => response.json()) .then(data => console.log(data)) - lang: NodeJS source: |- require('axios') .get("https://api.cryptoquant.com/v2/network/base-fee?asset=eth&window=day", { headers: { Authorization: 'Bearer ' } }) .then(response => console.log(response)) - lang: Ruby source: >- require 'net/http' uri = URI("https://api.cryptoquant.com/v2/network/base-fee?asset=eth&window=day") req = Net::HTTP::Get.new(uri) req["Authorization"] = "Bearer " res = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |http| http.request(req) } puts res.body - lang: Python source: >- import requests headers = {'Authorization': 'Bearer '} url = "https://api.cryptoquant.com/v2/network/base-fee?asset=eth&window=day" print(requests.get(url, headers=headers).json()) components: schemas: Status: type: object description: >- Returned with every response; indicates whether the request was successful. required: - code - message properties: code: type: integer format: int32 description: HTTP status code. message: type: string description: Text description of the error or success. securitySchemes: AccessToken: type: http scheme: bearer bearerFormat: JWT description: >- For each API request, include the `Authorization` HTTP header with `Bearer {access_token}`. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.