Deutsche Börse

Deutsche Börse Cloud Stream Market Data API

Cloud-delivered real-time market data streaming over WebSocket (host md.deutsche-boerse.com) with Protocol Buffers or JSON message encoding and API-key authentication - the published sample client subscribes to subjects such as md-tradegate (Tradegate quotes in CEF format).

Documentation GitHub

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AsyncAPI Specification

# generated: 2026-07-22
# method: generated
# source: https://github.com/Deutsche-Boerse/Cloud.Stream.Client (README + proto/src),
#   faithful description of the documented WebSocket surface - no channels or
#   messages invented beyond what the official sample client and schemas publish.
asyncapi: 3.0.0
info:
  title: Deutsche Börse Cloud Stream Market Data
  version: 001.000.011
  description: |
    Real-time market data streaming over WebSocket from Deutsche Börse Cloud
    Stream. Clients connect to md.deutsche-boerse.com with an API key generated
    in the GUI (passed as a token; the official Python client uses JWT), then
    subscribe to a subject (for example md-tradegate for Tradegate quotes in CEF
    format). Messages are serialized as Protocol Buffers (recommended) or JSON,
    using the published schemas client.proto, md_cef.proto, md_crypto.proto and
    md_energy.proto.
  externalDocs:
    url: https://github.com/Deutsche-Boerse/Cloud.Stream.Client
defaultContentType: application/x-protobuf
servers:
  production:
    host: md.deutsche-boerse.com
    protocol: wss
    description: Cloud Stream production WebSocket endpoint; API-key authenticated.
channels:
  subject:
    address: '{subject}'
    description: Subject-based subscription channel. The published example subject
      is md-tradegate (Tradegate quotes, CEF format); available subjects depend on
      the customer's market data entitlements.
    parameters:
      subject:
        description: Market data subject to subscribe to, e.g. md-tradegate.
    messages:
      subscriptionResponse:
        name: Client.Response
        contentType: application/json
        description: Subscription acknowledgement carrying requestId and
          subscription statusCode (type.googleapis.com/Client.Response), per
          client.proto.
      cefMarketData:
        name: dbag.cef.MarketData
        description: CEF market data message (bid/offer prices and sizes, trading
          status, instrument identification) per md_cef.proto v001.000.011.
      cryptoMarketData:
        name: md_crypto market data
        description: Crypto market data message per md_crypto.proto v001.000.006.
      energyMarketData:
        name: md_energy market data
        description: Energy market data message per md_energy.proto v001.000.008.
operations:
  subscribeSubject:
    action: receive
    channel:
      $ref: '#/channels/subject'
    description: Subscribe to a subject and receive streamed market data messages;
      the sample invocation is client.py --websocket-server md.deutsche-boerse.com
      --subject md-tradegate --token $API_KEY --msgFormat json.