> ## Documentation Index
> Fetch the complete documentation index at: https://api-reference.hyperswitch.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Set Cost Cluster Override

> Override the modelled fee for a specific cost cluster identified by its cluster key.



## OpenAPI

````yaml decision_engine_openapi-specs.json PUT /merchant-account/{merchant_id}/cost-clusters/{cluster_key}/fee-override
openapi: 3.1.0
info:
  title: Decision Engine
  description: >-
    Open-source payment gateway routing service by Juspay. Selects the optimal
    payment processor for each transaction in real-time using success-rate
    scoring, rule-based routing, and elimination logic.


    ## Authentication


    This API supports two authentication methods:


    1. **JWT Bearer Token** - For dashboard/user sessions
       - Header: `Authorization: Bearer <jwt_token>`
       - Obtain via `/auth/login` endpoint

    2. **API Key** - For service-to-service/programmatic access
       - Header: `x-api-key: DE_<64_char_hex>`
       - Create via `/api-key/create` endpoint

    Protected endpoints require one of these authentication methods.
  version: 1.4.0
  contact:
    name: Juspay
    url: https://github.com/juspay/decision-engine
  license:
    name: AGPL-3.0
    url: https://www.gnu.org/licenses/agpl-3.0.html
servers:
  - url: http://localhost:8080
    description: Local development
  - url: https://sandbox.hyperswitch.io
    description: 'Hyperswitch sandbox with x-feature: decision-engine'
security: []
tags:
  - name: Health
    description: Service liveness, readiness, and diagnostics
  - name: Auth
    description: Dashboard auth and merchant selection
  - name: API Keys
    description: Service-to-service API key management
  - name: Gateway Decision
    description: Core routing decision APIs
  - name: Score Feedback
    description: Feed transaction outcomes back to improve SR scoring
  - name: Merchant Account
    description: Merchant configuration management
  - name: Routing Rules
    description: Euclid declarative routing rules engine
  - name: Rule Configuration
    description: Service-level SR/elimination config
  - name: Config
    description: Routing key and dimension metadata
  - name: Analytics
    description: ClickHouse-backed analytics and audit reads
  - name: Compatibility
    description: Legacy compatibility routes
  - name: Connector Costs
  - name: Merchant Features
  - name: Autopilot
paths:
  /merchant-account/{merchant_id}/cost-clusters/{cluster_key}/fee-override:
    put:
      tags:
        - Connector Costs
      summary: Set Cost Cluster Override
      description: >-
        Override the modelled fee for a specific cost cluster identified by its
        cluster key.
      operationId: setClusterOverride
      parameters:
        - name: merchant_id
          in: path
          required: true
          schema:
            type: string
          example: merchant_demo
        - name: cluster_key
          in: path
          required: true
          schema:
            type: string
          example: visa|credit|US|USD
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SetClusterOverrideRequest'
            example:
              pct_bps: 210
              fixed: 0.12
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ClusterOverride'
      security:
        - BearerAuth: []
        - ApiKeyAuth: []
components:
  schemas:
    SetClusterOverrideRequest:
      type: object
      properties:
        pct_bps:
          type: number
          format: double
        fixed:
          type: number
          format: double
      required:
        - pct_bps
        - fixed
    ClusterOverride:
      type: object
      properties:
        dims:
          $ref: '#/components/schemas/ClusterDims'
        pct_bps:
          type: number
          format: double
        fixed:
          type: number
          format: double
        updated_at:
          type: string
    ClusterDims:
      type: object
      description: >-
        Cluster dimension breakdown (connector, card network, funding, issuer
        country, currency, IC category).
      additionalProperties: true
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
      description: JWT token obtained from /auth/login
    ApiKeyAuth:
      type: apiKey
      in: header
      name: x-api-key
      description: API key created via /api-key/create

````