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Unusual Whales API

unusualwhales.com
Visit unusualwhales.com
Category
Finance
Rank
No. 1050Tools index

Previous survey · No. 1056 ·

Pricing
Paid
Platform
web
Type
TOOL
Date

About

Provides real-time and historical market data through a comprehensive API, including options flow, dark pool data, congressional trading, and institutional holdings. Designed for traders, analysts, and developers who need access to specialized financial market intelligence.

What it does

Its site describes the product as a REST API with over 100 endpoints across 19 categories covering options flow, dark pool prints, congressional trades, gamma exposure, and the CME futures tape, with optional WebSocket and Kafka streaming for real-time data.

Stated on the product site

Streaming interfaces
Offers REST as the base interface with optional WebSocket and Kafka streaming for real-time use cases
AI agent integration
Provides an MCP server so AI assistants and IDEs can call the API's tools directly
Data categories
Covers dark pool prints, congressional and insider trades, financials, news, technical indicators, and futures tape data under one API key
Pricing structure
Offers a free trial tier plus named paid tiers, and negotiates custom plans for larger needs
Standalone data access
Also sells individual historical data files through a separate data shop outside the API itself

Not stated on the site

  • The page doesn't show which programming languages have official client libraries beyond the raw REST examples shown.
  • The page doesn't show the license or terms governing redistribution or resale of the market data returned by the API.
  • The page doesn't show refund, cancellation, or downgrade terms for the paid subscription tiers.

Written from the product site at unusualwhales.com.

What it can do

  • Retrieve real-time options flow data

    API request with stock symbol and parameters → Live options trading activity and flow information

  • Access dark pool trading data

    API request with equity symbol and date range → Dark pool transaction volumes and pricing data

  • Track congressional trading activity

    API request with politician name or date parameters → Congressional members' stock trades and disclosures

  • Query institutional holdings data

    API request with company ticker or institution identifier → Institutional ownership positions and changes

  • Fetch historical market data

    API request with symbol, date range, and data type → Historical price, volume, and trading pattern data

  • Monitor unusual market activity alerts

    API request with alert criteria and thresholds → Notifications of abnormal trading patterns or volumes

Tags

apimarket-dataoptions-flowdark-pooltradingfinancial-datacongressional-trading

Media

Unusual Whales API

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