Awesome Public Real-Time Datasets and Sources

This list is inspired by awesome public datasets, but for real-time datasets and sources. Normally accessed via HTTP or Websockets.

The list is separated into Free and Paid and broken into subsections based on loose categories.

Free

Coinbase Market Data - Coinbase websocket to market data including level 2 orderbook data.
Blockchain transactions - Provides real-time notifications about new transactions and blocks.
Yahoo Financewss://streamer.finance.yahoo.com/ - This is not advertised in developer documentation, but discoverable as the websocket is used to update their website.
Finnhub - Limited free usage with a premium data sources also available.
CoinCheck - a cryptocurrency API that has a WebSocket interface (in beta)
Alpaca Markets Real-Time and historical market data via HTTP and Websocket.

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.
GBFS New York - GBFS is the standard for bike share data with many locations around the world. Find more information here
Open Sky Flight - Data from Open Sky Api via HTTP endpoint. Supports real-time, but not streaming. Need to continually poll.
Open Glider Network - The OGN provides real-time traffic for gliders and other light aircraft. You can use an OGN client like python-ogn-client to connect to OGN servers, parse the APRS messages and push them to a broker like Kafka for streaming processing.
MTA GTFS Feed - Transit data in GTFS format for transit systems like NYC subway and Caltrain.
NY 511 live camera data - This live camera data requires some scraping to use. From this list of cameras you can then source the individual camera id and then request the timestamped image or most recent image by building the url like - https://511ny.org/map/Cctv/<image-id-goes-here>
Transport for London (TfL) - live data about the tube, buses, and more
Norwegian Coastal Administration - AIS data from vessels within the Norwegian economic zone and the protection zones off Svalbard and Jan Mayen.

Wikimedia SSE Event Stream of recent changes to the wikimedia foundation pages.
Seismic Data Seismic Portal provides a websocket interface to real-time seismic events.
Open Weather API - Current weather data available free at rate of 1 request per second.
Clima Cell - Real-time weather data in a free or paid API.
NOAA Buoy Data - Real-time buoy data from NOAA
NOAA Weather Data - Live Weather Data API from NOAA
Redfin Realestate - pull uptodate data from redfin unofficial API.
EPA Airnow data - Air quality data hosted by the EPA.
UK Flood Data - UK government real-time API for flood data.

GitHub Events - Use the GitHub API to consume public events happening on GitHub.
EventSim - Tool to simulate event data
Formula 1 Stats & Telemetry - Python package that provides an easy-to-use API into live and historical F1 data.
International Space Station Live Data - More about the project on GitHub https://github.com/ISS-Mimic/Mimic

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.
Twitter - Twitter provides a streaming interface for research or enterprise. It is unknown what support will be post Twitter purchase in 2022.

PurpleAir Air Quality Data - Developer API for accessing purple air sensor data.