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Awesome Public Streaming Datasets

This list is a complement to awesome public datasets, a list of datasets that provide a streaming interface, typically via WebSockets.

The list includes both free APIs, and those which you have to pay to use - 💰

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.
Bitquery.io - Bitquery provides blockchain data, offering real-time streaming APIs for 40+ chains, NFT APIs, and a money flow investigation tool.
IEX Trading - IEX was created in response to questionable trading practices that had become widely used across traditional exhcanges! Their API provides streaming Stock market 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)
💰 Twitter - Twitter provides a streaming interface for Enterprise clients
💰 Saxo Bank OpenAPI - This API provides access to Saxo Bank's trading engine, which includes streaming price feeds.
EventSim - Program that generates event data for a fake music web site (similar to Spotify).
💰 ShadowTraffic - ShadowTraffic provides free and paid editions of a developer tool for generating synthetic streaming data. Mostly useful for stream processing data.

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