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

# Price board (WSS, derivative) (contracts)

> Real-time derivative price board over WebSocket.



## OpenAPI

````yaml /en/openapi/tcbs-v1.yaml get /api/v1/derivatives/contracts
openapi: 3.0.3
info:
  title: TCBS iFlash Open API
  description: REST APIs for trading stocks and derivatives on TCBS.
  version: 1.0.0
  contact:
    email: openapi@tcbs.com.vn
servers:
  - url: https://openapi.tcbs.com.vn
    description: Production
security:
  - bearerAuth: []
paths:
  /api/v1/derivatives/contracts:
    get:
      summary: Price board (WSS, derivative) (contracts)
      description: Real-time derivative price board over WebSocket.
      responses:
        '200':
          description: Successful response
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT

````

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