> ## 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.

# BackQuant API

> Professional-grade options + GEX analytics for crypto markets

BackQuant gives you programmatic access to institutional-quality options
analytics for crypto markets — gamma exposure (GEX), implied volatility
surfaces, dealer positioning, max-pain, OPEX calendar, and risk-neutral
probability distributions — through a single REST API.

<CardGroup cols={2}>
  <Card title="Quick start" icon="bolt" href="/quickstart">
    Make your first API call in under five minutes.
  </Card>

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

  <Card title="API reference" icon="code" 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 the common workflows.
  </Card>
</CardGroup>

## What you can build

<CardGroup cols={2}>
  <Card title="GEX levels & walls" icon="chart-bar" href="/api/v2/gex/levels">
    HVL, call resistance, put support, max-pain, expected move — in a
    single composable call.
  </Card>

  <Card title="OPEX calendar" icon="calendar-days" href="/api/v2/options/opex">
    Daily / weekly / monthly / quarterly classification with per-expiry
    OI, walls, and max-pain.
  </Card>

  <Card title="Filtered options chain" icon="filter" href="/api/v2/options/chain">
    Two-layer projection (`?fields=` + `?include=`), moneyness filters,
    payload caps for desk-friendly responses.
  </Card>

  <Card title="IV analytics suite" icon="wave-square" href="/api/v2/options/iv/surface">
    Surface, term structure, skew, smile, IV-RV, VRP — every standard
    slice of the implied-vol surface.
  </Card>

  <Card title="Probability density" icon="chart-area" href="/api/v2/options/probability/density">
    Risk-neutral PDF/CDF via Breeden-Litzenberger with confidence-band
    interpolation per expiry.
  </Card>

  <Card title="Multi-symbol bundle" icon="layer-group" href="/api/v2/multi/gex-levels">
    BTC + ETH + SOL + HYPE GEX levels in one round-trip — one Redis
    `MGET`, four symbols.
  </Card>
</CardGroup>

## Get started in 3 steps

<Steps>
  <Step title="Get your API key">
    Sign in at [**backquant.com/api-access**](https://backquant.com/api-access)
    and create a key.
  </Step>

  <Step title="Make your first request">
    Pass your key in the `X-API-Key` header and call any endpoint.

    ```bash theme={null}
    curl "https://api.backquant.com/v2/gex/levels?symbol=BTCUSDT" \
      -H "X-API-Key: bq_live_your_api_key_here"
    ```
  </Step>

  <Step title="Explore the data">
    Read [What is GEX?](/concepts/gex) to ground yourself in what the
    data means, then browse the
    [API reference](/api/v2/gex/levels) to discover the rest.
  </Step>
</Steps>