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Polygon.io

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Polygon.io's data streams offer a real-time window into the dynamic world of financial markets. They provide continuous updates, enabling you to track market movements, build live dashboards, and create applications that require immediate information. 

 Unlike traditional API calls that return a single snapshot of data, data streams provide a constant stream of updates as new information becomes available. 

 Polygon.io utilizes WebSockets technology for its data streams. WebSockets establish a persistent connection between your application and the Polygon.io servers, allowing for bi-directional communication.

  Data streams give you access to live market prices, trades, quotes, and other critical information as it happens.

 Polygon.io offers various data streams for different asset classes and data types. Choose the stream that best suits your needs, whether it's stock trades, options quotes, cryptocurrency prices, or other options.

  You'll need to authenticate your connection with your API key to gain access to the data stream. 

 Follow the specific instructions in the API documentation for connecting to the chosen stream through WebSockets. This will typically involve specifying the stream endpoint, providing your API key, and establishing a WebSocket connection.

 Data streams deliver updates in a structured format, often as JSON messages.

 Set up event handlers in your application to process the incoming data messages. These handlers will trigger actions based on the specific data received.

 You can apply filters to the data stream to isolate specific data points or events. You'll also need to process the data to extract relevant information and perform calculations or visualizations.

  Build real-time dashboards that display live market data, price charts, and advanced indicators.

 React to market movements in milliseconds to execute trades based on real-time information.

  Trigger alerts or notifications based on specific price changes, trading activity, or other market events.

By working with Polygon.io's data streams, you harness the power of live financial data to create applications that adapt to market dynamics and provide valuable insights.

Discover the power of streaming data and learn how to connect to real-time market updates.

Working with Data Streams

API endpoints are the specific addresses within Polygon.io's API that allow you to access different types of financial data. Think of them as gateways to various data sets, each with its own unique functionality and information. 

 The official documentation is your comprehensive guide to understanding available endpoints. Access it at [https://polygon.io/docs](https://polygon.io/docs)

 The documentation typically organizes endpoints by data category. You'll find sections for stocks, options, forex, crypto, aggregate bars, and more. 

 Each endpoint has a unique path that you append to the base URL of the Polygon.io API (`https://api.polygon.io/`). For instance, `/v2/stocks/ticker/AAPL` would be the path for retrieving information about the Apple stock ticker. 

 Many endpoints accept query parameters to refine your data request. These parameters are added to the URL after a question mark (?) and typically use key-value pairs. For example, you could specify a specific date range or filter data based on certain conditions. 

  Different endpoints often use different HTTP methods (like GET or POST) to perform specific actions. The documentation will clearly indicate which method is supported for each endpoint.

  Most Polygon.io endpoints return data in JSON format, but you might find options for other formats like CSV. Refer to the documentation for specific endpoint response formats.

  Retrieve historical prices, quotes, news, corporate events, and more for individual stocks. 

 Access real-time and historical options data, including quotes, chains, and expirations. 

 Get forex quotes, historical rates, and other relevant information.

 Explore cryptocurrency data, including prices, market caps, and historical rates.

  Generate custom time-aggregated bars for various data types to perform technical analysis.

By understanding the structure of API endpoints and utilizing the Polygon.io documentation, you can effectively target the specific data you need and build sophisticated data solutions for financial analysis.

Explore the different API endpoints available and learn how to use them to access specific data types.

Understanding API Endpoints

Polygon.io implements rate limits to ensure a fair and efficient use of its API for all users. These limits are designed to prevent excessive requests from overwhelming the system and impacting the performance for everyone.  

  Rate limits generally restrict the number of API requests you can make within a given time period, typically measured in seconds.

  Your rate limits are determined by your chosen data plan.  More comprehensive plans often have higher limits to accommodate greater usage.

  Rate limits might also be influenced by the specific API endpoint you're using and the complexity of the data being retrieved.

 If you exceed the rate limit for your plan, you'll receive an error response from the API. 

  For repeated rate limit violations, the API might temporarily throttle your requests, slowing down your access to data.

  Excessive requests can lead to delays and inconsistencies in your applications that rely on the Polygon.io API.

 Review the documentation for your data plan to determine the specific rate limits that apply to you. 

 Track your API calls and monitor your usage against your rate limits. 

 Implement error handling in your applications to gracefully handle rate limit violations and retry requests after appropriate delays.

By understanding and following best practices for API usage, you can ensure a reliable and efficient experience with Polygon.io's valuable financial data.

Understand the limitations and best practices for using the Polygon.io API to avoid exceeding rate limits.

API Reference

Working with Data Streams

Understanding API Endpoints

API Rate Limits and Usage