AlgoseekFree tier
Options Data APIs
Institutional US options (OPRA) data: historical trades, NBBO quotes and minute bars from 2015, plus real-time and delayed feeds.
Paid plans from$1,000/mo
Unusual Whales API
Options flow and market data API from Unusual Whales: real-time flow, GEX, dark pool and congressional trades over REST, WebSocket and MCP.
Pricing: Unusual Whales API starts at $99/mo. 7-day free trial for new API subscribers on Options Starter and Basic.
Best for
Developers building flow alerts, bots or dashboards on Unusual Whales data
Notable features
- Real-time options flow (100% market coverage) with bid, ask, Greeks, open interest and volume
- GEX, dark pool, net premium, market tide and daily open interest including FLEX
- 1-year lookback and 25,000 requests a month on Options Starter; 2-year lookback and unlimited daily requests on Basic and Advanced
- WebSocket streaming of option trades and 1-minute SPX market maker exposure
- MCP support and custom agent skills; bulk history sold separately in the Data Shop
Pricing notes
API Options Starter $99/mo (1-year lookback, 25,000 requests a month); API Basic $150/mo (2-year lookback, unlimited daily requests); API Advanced $375/mo, billed monthly. Annual billing is offered but we didn't capture annual prices. Personal use only; redistribution isn't allowed. The API is separate from Unusual Whales' dashboard plans.
Alternatives to Unusual Whales API
AlpacaFree tier
Options Data APIs
Developer trading API with commission-free multi-leg options, paper trading and market data.
Paid plans from$99/mo
Stock, options, forex and economic data API; realtime and 15+ years of historical US options chains are premium endpoints.
From$49.99/mo
Cboe's store for historical US options data files: end-of-day summaries, interval quotes and trades, with optional IV and Greeks.
Price not listed
Usage-based market data API with tick-level OPRA options data, plus futures and equities, through one historical and live API.
Price not listed
Financial data APIs, including a US stock options add-on with end-of-day chains, Greeks and IV for 6,000+ US stocks.
From$39.99/mo
Unusual Whales API FAQ
Is Unusual Whales API free?
No. Unusual Whales API does not offer a free plan. Trial: 7-day free trial for new API subscribers on Options Starter and Basic.
How much does Unusual Whales API cost?
Unusual Whales API starts at $99/mo. API Options Starter $99/mo (1-year lookback, 25,000 requests a month); API Basic $150/mo (2-year lookback, unlimited daily requests); API Advanced $375/mo, billed monthly. Annual billing is offered but we didn't capture annual prices. Personal use only; redistribution isn't allowed. The API is separate from Unusual Whales' dashboard plans.
Does Unusual Whales API have a free trial?
7-day free trial for new API subscribers on Options Starter and Basic.