> ## Documentation Index
> Fetch the complete documentation index at: https://docs.backquant.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction

> Professional-grade options + GEX analytics for crypto markets

BackQuant is a professional market-data API focused on **crypto options
analytics**: gamma exposure (GEX), implied volatility surfaces, dealer
positioning, max-pain, OPEX calendar, and risk-neutral probability
distributions. The same data that powers the BackQuant terminal is
available programmatically, ready to plug into your trading systems,
research workflows, and dashboards.

<Card title="Get your API key" icon="key" href="https://backquant.com/api-access" horizontal>
  Sign up at **backquant.com/api-access**.
</Card>

This API is for personal-use plans. No redistribution is permitted —
see our [Terms of Service](https://www.backquant.com/terms) for details.
Custom and Enterprise plans are available; contact [dev@backquant.com](mailto:dev@backquant.com).

## Base URL

```text theme={null}
https://api.backquant.com/v2/
```

## Get started

<CardGroup cols={2}>
  <Card title="Authentication" icon="key" href="/authentication">
    Get your API key and authenticate your first request.
  </Card>

  <Card title="Quick start" icon="bolt" href="/quickstart">
    Make your first API call in under five minutes.
  </Card>

  <Card title="API reference" icon="book-open" href="/api/v2/gex/levels">
    Browse all 38 endpoints with interactive try-it-out.
  </Card>

  <Card title="Code examples" icon="terminal" href="/examples/python">
    Python, TypeScript, and curl recipes for common workflows.
  </Card>
</CardGroup>

## What's covered

The API is focused on the data crypto options traders actually
trade against. Everything is computed by us from raw exchange chains
(Deribit + Bybit + OKX + Binance) and refreshed every 30 seconds.

| Category          | What's in it                                                                                                                                                                                                                               |
| ----------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| **GEX**           | Composable levels (HVL / call wall / put support / max-pain / expected move / gamma flip zones), strike profiles, expiry profiles, strike × expiry heatmap, time heatmap with greek + DTE filters, history, Postgres-backed stress history |
| **Options chain** | Filtered chain with two-layer projection (`?fields` + `?include`), expiry summary table, OPEX calendar with daily/weekly/monthly/quarterly classification                                                                                  |
| **IV analytics**  | Surface, term structure, 25Δ/10Δ skew, butterfly, full smile per expiry, single-expiry smile, IV-RV history, VRP                                                                                                                           |
| **Greeks**        | DEX, theta, vanna, charm, vega — per-strike profiles + strike × time surfaces + 3D strike × expiry surface                                                                                                                                 |
| **Probability**   | Breeden-Litzenberger PDF/CDF + 3D probability surface + confidence-band interpolation                                                                                                                                                      |
| **Open interest** | By expiry, time-series with cursor pagination, put/call ratio (intraday + daily)                                                                                                                                                           |
| **Other**         | Premium tide (0DTE + weekly), dated-futures basis, liquidation heatmap + distribution, multi-symbol GEX bundle                                                                                                                             |

## Concepts before reference

If you're new to options analytics or just want a refresher on what
this data means in trader terms:

<CardGroup cols={2}>
  <Card title="What is GEX?" icon="chart-line" href="/concepts/gex">
    Gamma exposure, dealer positioning, walls and support levels.
  </Card>

  <Card title="OPEX calendar" icon="calendar-days" href="/concepts/opex">
    Why monthly and quarterly expirations matter.
  </Card>

  <Card title="Max pain" icon="bullseye" href="/concepts/max-pain">
    The strike where option writers profit most.
  </Card>

  <Card title="Probability density" icon="chart-area" href="/concepts/probability-density">
    Breeden-Litzenberger explained for traders.
  </Card>

  <Card title="The IV suite" icon="wave-square" href="/concepts/iv-suite">
    Surface, term structure, skew, smile.
  </Card>

  <Card title="Greeks beyond delta" icon="function" href="/concepts/greeks">
    DEX, vanna, charm, vega — what they measure.
  </Card>
</CardGroup>