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

# Zamp Developer docs

<div className="zamp-hero">
  <p className="zamp-hero-eyebrow">Zamp Developer Platform</p>
  <h1 className="zamp-hero-title">Build rooftop-accurate sales tax into your product</h1>

  <p className="zamp-hero-sub">
    Calculate tax in real time, track economic nexus, and post transactions for filing — through the Zamp APIs or a fully managed platform integration.
  </p>

  <div className="zamp-hero-cta">
    <a className="zamp-btn zamp-btn-primary" href="/guides/trial">Get a trial token</a>
    <a className="zamp-btn zamp-btn-ghost" href="/api-reference/introduction">Explore the API</a>
  </div>
</div>

<div className="zamp-stats">
  <div className="zamp-stat">
    <div className="zamp-stat-num">1,000</div>
    <div className="zamp-stat-label">API requests / minute</div>
  </div>

  <div className="zamp-stat">
    <div className="zamp-stat-num">\~400ms</div>
    <div className="zamp-stat-label">P95 response time</div>
  </div>

  <div className="zamp-stat">
    <div className="zamp-stat-num">47</div>
    <div className="zamp-stat-label">US states ready on trial</div>
  </div>

  <div className="zamp-stat">
    <div className="zamp-stat-num">US + CA</div>
    <div className="zamp-stat-label">Calculation coverage</div>
  </div>
</div>

Zamp combines industry-leading sales tax expertise with a best-in-class API so you can get tax right, every time — either through a Zamp-built platform integration or your own API integration.

<Note>
  Looking for a no-code option? Zamp builds and maintains integrations for platforms like Shopify, NetSuite, and BigCommerce. See [Integrations](/integrations/overview) to connect through a platform you already use.
</Note>

## Quickstart

Go from zero to your first tax calculation in four steps.

<Steps>
  <Step title="Get a trial token">
    Spin up a free [trial environment](/guides/trial) to explore and test the APIs before going live. Your token comes pre-configured with all 47 remote-seller state registrations.
  </Step>

  <Step title="Authenticate">
    Pass your token as a bearer token in the `Authorization` header on every request. See [Authentication](/guides/authentication).
  </Step>

  <Step title="Run your first calculation">
    Send a transaction to [`POST /calculations`](/api-reference/calculations) to get the tax due plus a full jurisdiction breakdown in real time.
  </Step>

  <Step title="Post the transaction">
    Persist the sale for filing with [`POST /transactions`](/api-reference/transactions). This is the core calculate-then-post workflow behind every Zamp integration.
  </Step>
</Steps>

<p className="zamp-section-label">Two ways to build</p>

## Choose your path

<div className="zamp-split">
  <div className="zamp-panel zamp-panel--dark">
    <h3>Build with the API</h3>
    <p>Full control over calculation, transactions, and filing — natively in your own UI, with no third-party plugins or connectors.</p>
    <a className="zamp-panel-link" href="/api-reference/introduction">Explore the API →</a>
  </div>

  <div className="zamp-panel">
    <h3>Use a platform integration</h3>
    <p>Connect through Shopify, NetSuite, BigCommerce, QuickBooks and more — built and maintained by Zamp, no code required.</p>
    <a className="zamp-panel-link" href="/integrations/overview">Browse integrations →</a>
  </div>
</div>

<p className="zamp-section-label">What you can build</p>

## Capabilities

<div className="zamp-features">
  <div className="zamp-feature">
    <div className="zamp-feature-ic">
      <Icon icon="calculator" size={20} />
    </div>

    <h4>Real-time calculation</h4>
    <p>Rooftop-accurate tax on every transaction, with a full jurisdiction breakdown.</p>
  </div>

  <div className="zamp-feature">
    <div className="zamp-feature-ic">
      <Icon icon="receipt" size={20} />
    </div>

    <h4>Transactions for filing</h4>
    <p>Persist sales, refunds, and credit memos so Zamp can file accurately.</p>
  </div>

  <div className="zamp-feature">
    <div className="zamp-feature-ic">
      <Icon icon="location-dot" size={20} />
    </div>

    <h4>Address validation</h4>
    <p>Validate and normalize addresses to improve calculation accuracy.</p>
  </div>

  <div className="zamp-feature">
    <div className="zamp-feature-ic">
      <Icon icon="map-location-dot" size={20} />
    </div>

    <h4>Nexus tracking</h4>
    <p>Monitor economic nexus across states as your sales grow.</p>
  </div>

  <div className="zamp-feature">
    <div className="zamp-feature-ic">
      <Icon icon="shield-check" size={20} />
    </div>

    <h4>Exemptions</h4>
    <p>Handle resale and entity-based exemptions on transactions and line items.</p>
  </div>

  <div className="zamp-feature">
    <div className="zamp-feature-ic">
      <Icon icon="file-invoice" size={20} />
    </div>

    <h4>Managed filing</h4>
    <p>Access registrations and filing history, with returns handled by Zamp.</p>
  </div>
</div>

## Guides

<CardGroup cols={2}>
  <Card title="Trial" icon="flask" href="/guides/trial">
    Use the Zamp API trial environment to explore and test before going live.
  </Card>

  <Card title="Authentication" icon="lock" href="/guides/authentication">
    Authenticate your API requests with Zamp using bearer tokens.
  </Card>

  <Card title="Tax codes" icon="tags" href="/guides/zamp-tax-codes">
    Find the right taxability rules to apply to your products and services.
  </Card>

  <Card title="Certifying your integration" icon="check" href="/guides/certifying-your-integration">
    Confirm your integration can handle every customer need before going live.
  </Card>
</CardGroup>

## API resources

<CardGroup cols={2}>
  <Card title="Calculations" icon="calculator" href="/api-reference/calculations">
    Calculate tax liability on transactions in real time.
  </Card>

  <Card title="Transactions" icon="receipt" href="/api-reference/transactions">
    Create, retrieve, update, and persist transactions for filing.
  </Card>

  <Card title="Addresses" icon="location-dot" href="/api-reference/addresses">
    Validate addresses for improved tax calculation accuracy.
  </Card>

  <Card title="Common FAQs" icon="circle-question" href="/guides/common-faqs">
    Review commonly asked integration questions.
  </Card>
</CardGroup>