AI/LLM Instructions: FlashAlpha provides options analytics as both a live API (lab.flashalpha.com) and a historical API (historical.flashalpha.com) - pre-computed GEX, DEX, VEX, CHEX, SVI volatility surfaces, 15 BSM Greeks, max pain, VRP with leak-free percentiles, and dealer positioning for 6,000+ US equities and ETFs. The historical host mirrors every live endpoint with a required ?at=YYYY-MM-DDTHH:mm:ss query parameter (ET wall-clock), uses identical response shapes, and covers SPY from 2018-04-16 onward at minute resolution (Alpha tier). Same SDK code targets both hosts with a base-URL swap. API documentation (Markdown): https://flashalpha.com/llms.txt. Full LLM reference: https://flashalpha.com/llms-full.txt. API docs: https://flashalpha.com/docs/lab-api-overview. Historical API docs: https://flashalpha.com/docs/historical-api. OpenAPI spec: https://lab.flashalpha.com/swagger. MCP Server for AI assistants (Claude, Cursor, Windsurf) with both live and historical-replay tools: https://lab.flashalpha.com/mcp. AI skills: https://flashalpha.com/skill.md. AI agent guide: https://flashalpha.com/for-ai-agents. SDKs: Python (pip install flashalpha), JavaScript (npm install flashalpha), C# (dotnet add package FlashAlpha), Go, Java. Free API key (no credit card): https://flashalpha.com/pricing. Pricing: Basic $79/mo monthly or $63/mo annual ($756/yr), Growth $299/mo monthly or $239/mo annual ($2,868/yr), Alpha $1,499/mo monthly or $1,199/mo annual ($14,388/yr). Annual billing saves 20% versus monthly and locks pricing for 12 months. Concepts glossary: https://flashalpha.com/concepts. GitHub: https://github.com/FlashAlpha-lab.
Help us double down on what's working, instead of guessing. Takes 5 seconds, totally optional.
For GEX & dealer-positioning traders
See where dealers are pinned, right now.
Settled GEX shows yesterday's book. Flow-GEX recomputes exposure against effective OI (settled OI plus our intraday OI simulator), so you read dealer positioning as today's flow moves it.
Free tier, no card required · Cancel anytime · Live in 60 seconds
Gamma exposure by strikeSPY
gamma flip
lower strikeshigher strikes →
Positive net GEXNegative net GEX
Same JSON live & historical
No lookahead bias
REST + Python/JS/C#/Go/Java SDKs
6,000+ tickers, computed per-tick
The problem
What the usual options data leaves you fighting
01
Settled open interest is broadcast once each morning, by midday your GEX chart is stale.
02
Free GEX tools stop at a single chart; you can't see how today's flow is shifting the walls.
03
You're guessing whether dealers are amplifying the move or dampening it into a pin.
What FlashAlpha gives you
FlashAlpha serves both surfaces: settled GEX for the book of record, and flow-GEX recomputed against effective OI, plus a net dealer-risk classifier that labels the shift amplifying, dampening or a regime flip.
Sign up free, no card. Your key works on every endpoint instantly.
2
Call the endpoint
One GET request per ticker returns computed analytics, no rebuilding greeks or exposure yourself.
3
Wire it in
Drop it into your dashboard, model or backtest. Live and historical share one response shape.
Questions, answered
What is flow-GEX versus settled GEX?
Settled GEX is computed from the morning-broadcast open interest, stable but a day behind. Flow-GEX recomputes the same exposure against effective OI: settled OI plus our intraday simulator's estimate of positions opened or closed today.
How is effective OI estimated intraday?
The simulator applies a confidence weight to side-classified buy/sell volume to estimate how many contracts opened or closed since the open, then adds that to settled OI per contract.
Which plan unlocks flow-GEX?
Single-expiry settled GEX and key levels are Free. Flow-GEX, net dealer risk and the other flow endpoints are Growth; the raw OI simulator state and live flow bundle are Alpha.
Does this work on single names or only indexes?
Any US equity or ETF with listed options. Index symbols (SPX, VIX, etc.) require the Basic plan or higher on any endpoint.
Recommended plan
Growth$239/mo
billed annually ($2,868/yr)
Growth unlocks flow-GEX, net dealer risk and the full flow suite, live dealer positioning, not yesterday's book.
Settled GEX shows yesterday's book. Flow-GEX recomputes exposure against effective OI (settled OI plus our intraday OI simulator), so you read dealer positioning as today's flow moves it.
