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. Concepts glossary: https://flashalpha.com/concepts. GitHub: https://github.com/FlashAlpha-lab.
Options skew measures the difference in implied volatility between out-of-the-money puts and equidistant calls. The 25-delta skew compares the IV of a 25-delta put to a 25-delta call.
Steep skew: The market is pricing in higher demand for downside protection. This is typical of equity indices and individual stocks with tail risk.
Flat or inverted skew: Can indicate squeeze positioning, bullish sentiment, or heavy call buying driving up upside IV.
Term Structure Regimes
Contango (normal): Longer-dated options have higher IV than shorter-dated. Reflects time-value premium and normal uncertainty growth.
Backwardation (inverted): Near-term IV exceeds far-term. Signals an imminent catalyst: earnings, FOMC, FDA decision, or other binary event.
Flat: Uniform IV across the curve. Can indicate low conviction or a transition between regimes.