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Welcome to Aries API Documentation

Explore our APIs to build powerful trading applications. Find comprehensive guides, API references, and examples to get started.

Navigate through our API documentation using the sidebar. You can find detailed information about our Order API, Market Data WebSocket API, and User API.

API Changelog

Track updates and changes to the Aries APIs.

Version 1.0.4
Released on June 22, 2025
Current

Market Data API Enhancements

  • Added Time and Sales (T&S) data retrieval via the WebSocket Request/Response model (tns/SYMBOL).
  • Expanded available data fields for subscriptions to include: tradeTimestamp, quoteTimestamp, high52Week, low52Week, openInterest, and dividend.
  • Updated date format in API examples for option expiry dates to YYYY-MM-DD.
Version 1.0.3
Released on June 5, 2025

WebSocket API Enhancements

  • Streamlined authentication message format for both Market Data (/v1/marketdata/ws) and Account (/v1/accounts/ws) WebSockets. A single, unified format is now used.
Version 1.0.2
Released on May 24, 2025

WebSocket API Updates

  • Updated WebSocket endpoint to /v1/marketdata/ws
  • Added mandatory ping messages for connection keep-alive
  • Updated subscription types to "equityComposite" and "optionComposite"
  • Added new Request/Response model for on-demand queries
  • Added support for retrieving option expiry dates and option symbols
  • Updated field names and descriptions for better clarity
  • Added development notice for API stability

Bug Fixes

  • Fixed connection stability issues in the WebSocket API
  • Improved error handling and reporting
  • Enhanced documentation with more detailed examples
Version 1.0.0
Released on April 25, 2024

Initial Release

  • Order API with endpoints for placing, updating, canceling, and previewing orders
  • WebSocket API for real-time market data and account information
  • User API for authentication and account management
  • Authentication using API keys and JWT tokens
Coming Soon
Planned features and improvements
Planned

New Features

  • Enhanced order types including trailing stops and OCO (One-Cancels-Other) orders
  • Historical market data API
  • Expanded account management API for user profiles and preferences
  • Improved WebSocket performance and reliability

Improvements

  • Expanded documentation with more code examples
  • Additional SDKs for popular programming languages
  • Rate limit increases for production applications