> ## Documentation Index
> Fetch the complete documentation index at: https://dexbuilder.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Get Trading Fee

> Get Trading Fee.

Returns the current trading-fee configuration.

**Base URL:** `https://api.dexbuilder.com`

**Authentication:** Use a Broker API Key and sign this request with `Timestamp` and `SIGN`. Pass a wallet address that belongs to your Broker in `X-User-Wallet-Address`. Calculate the signature using the external Broker path. See [Broker API Key and signing](https://dexbuilder.mintlify.site/en/api-reference/common/broker-authentication.md) and [Access on behalf of a user](https://dexbuilder.mintlify.site/en/api-reference/common/sub-user-wallet.md).

## Request

```bash theme={null}
curl -X GET "https://api.dexbuilder.com/api/v4/broker/prediction/fee" \
  -H "KEY: ${BROKER_API_KEY}" \
  -H "SIGN: ${SIGN}" \
  -H "Timestamp: ${TIMESTAMP}" \
  -H "X-User-Wallet-Address: ${USER_WALLET}"
```

No additional parameters are required unless shown in the OpenAPI definition.

The OpenAPI panel below is the source of truth for required parameters, types, enum values, and request-body fields. Timestamps are Unix timestamps unless the field description states otherwise.

## Response

Returns the current fee information and effective values.

A successful response uses HTTP 200. Invalid parameters or request bodies return HTTP 400. Private endpoints can return HTTP 401 when authentication fails, and temporary upstream failures can return HTTP 503. The error response contains a machine-readable label and message.

For order, position, claim, transfer, and account operations, treat the response as the current server result and query the resource again when the operation is asynchronous.


## OpenAPI

````yaml openapi/event-markets-en.yaml GET /api/v4/broker/prediction/fee
openapi: 3.0.3
info:
  title: DexBuilder Prediction Markets API
  version: 1.0.0
  description: DexBuilder Prediction Markets REST API.
servers:
  - url: https://api.dexbuilder.com
security: []
paths:
  /api/v4/broker/prediction/fee:
    get:
      summary: Get Trading Fee
      description: Get Trading Fee.
      operationId: query_fee
      parameters:
        - name: Timestamp
          in: header
          required: true
          description: >-
            Unix timestamp in seconds; the gateway allows at most 60 seconds of
            clock skew.
          schema:
            type: string
        - name: SIGN
          in: header
          required: true
          description: >-
            Hexadecimal HMAC-SHA512 signature over the external request path,
            query string, and body.
          schema:
            type: string
        - name: X-User-Wallet-Address
          in: header
          required: true
          description: >-
            End-user wallet address. The gateway checks that this wallet belongs
            to the current Broker.
          schema:
            type: string
        - name: fee_type
          in: query
          required: false
          schema:
            type: string
      responses:
        '200':
          description: Request succeeded
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/FeeResp'
        '400':
          description: Invalid request or parameters
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '401':
          description: Authentication failed
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '503':
          description: Service temporarily unavailable
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
      security:
        - BrokerAPIKey: []
components:
  schemas:
    FeeResp:
      type: object
      properties:
        items:
          type: array
          items:
            $ref: '#/components/schemas/FeeQueryItem'
      description: Response object.
    Error:
      type: object
      description: Error response.
      properties:
        label:
          type: string
          example: INVALID_ARGUMENT
        message:
          type: string
          example: invalid request
    FeeQueryItem:
      type: object
      properties:
        category:
          type: string
        fee_mode:
          type: string
        maker_fee_rate:
          type: string
        taker_fee_rate:
          type: string
      description: Response object.
  securitySchemes:
    BrokerAPIKey:
      type: apiKey
      in: header
      name: KEY
      description: Broker API Key, created through the project administrator's process.

````

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