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  • Coinbase - Coinbase provides a free market data fee; giving access to real-time price updates, level 2 data, orders and matches. This is a high frequency feed with hundreds of events each second.
  • EventSim - Program that generates event data for a fake music web site (similar to Spotify).
  • Bitquery.io - Bitquery provides blockchain data, offering real-time streaming APIs for 40+ chains, NFT APIs, and a money flow investigation tool.
  • ShadowTraffic - ShadowTraffic provides free and paid editions of a developer tool for generating synthetic streaming data. Mostly useful for stream processing data.
  • Blockchain transactions - Provides real-time notifications about new transactions and blocks.
  • Open Rail Data - A collection of APIs that provide data relating to the UK rail network, including reference data, train timetables, and live service updates. The live data is streamed using the STOMP protocol.
  • CoinCap - provides real-time pricing and market activity for over 1,000 cryptocurrencies.
  • Finnhub Stock API - Real-Time RESTful APIs and Websocket for Stocks, Currencies, and Crypto.
  • CoinCheck - a cryptocurrency API that has a WebSocket interface (in beta)
  • Saxo Bank OpenAPI - This API provides access to Saxo Bank's trading engine, which includes streaming price feeds.
  • Twitter - Twitter provides a streaming interface for Enterprise clients