For AI agents: a documentation index is available at the root level at /llms.txt and /llms-full.txt. Append /llms.txt to any URL for a page-level index, or .md for the markdown version of any page.
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GuidesAPI Reference
GuidesAPI Reference
    • Welcome to Ziptax
      • Quickstart
      • How to create an API key
      • How to find a TIC
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On this page
  • Choose your path
  • Why Ziptax
  • Authentication
  • Quick example
  • Where to next
  • Pricing & support

Welcome to Ziptax

Ziptax provides a developer-friendly API and an online lookup tool for precise sales tax data. By using geographic inputs such as a full street address, you can instantly determine the correct sales tax rates for any place in the United States and Canada.

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Quickstart

Get your first sales tax rate back from Ziptax in under five minutes
Next
Built with
12,000+
U.S. tax jurisdictions
80,000+
geographic boundaries
50 states + Canada
covered out of the box

Query by address or lat/lng to get door-level accurate rates adjusted for unincorporated areas, special districts, and origin-vs-destination sourcing rules. Rates are updated in real-time. No tables to maintain, no overnight syncs.

Choose your path

Ziptax SDKs
Recommended

Language SDKs

Idiomatic Go, Python, and Node.js clients with typed models, built-in retries, and full support for every Ziptax feature, including product rules, Canadian rates, and historical lookups.

Ziptax REST API

REST API

Hit /request/v60 directly from any language. Simple X-API-Key auth, predictable JSON responses, versioned endpoints from v10 to v60.

Ziptax agents and LLMs

Agents & LLMs

Plug Ziptax into Claude, Cursor, Devin, or any MCP-compatible agent. Installable Claude Skill, hosted MCP server, and a machine-readable OpenAPI spec.

Why Ziptax

Nationwide Coverage

Sales tax rates for every U.S. address and jurisdiction across all 50 states, plus Canadian rates on supported plans.

Real-Time Lookups

Fast, reliable responses on every request. No batch jobs, no overnight syncs.

Address or Coordinates

Query by free-form street address, latitude/longitude pair, or postal code.

Simple Auth

API key via header or query parameter. No OAuth dance required.

Product Codes

Optional per-item Taxability Information Codes (TICs) for precise product-level tax calculations.

Developer-First

OpenAPI 3 spec, predictable JSON responses, language SDKs, and an MCP server for AI agents.

Authentication

Ziptax supports two ways to supply your API key. Pick whichever fits your client:

  • Header (recommended): send X-API-Key: YOUR_API_KEY
  • Query parameter: pass key=YOUR_API_KEY on the request URL

Don’t have a key yet? Create a free account at platform.zip.tax.

Quick example

$curl -H "X-API-Key: YOUR_API_KEY" \
>  "https://api.zip-tax.com/request/v60?address=200+Spectrum+Center+Dr+Irvine+CA"

Want a guided walkthrough instead? The Quickstart gets you from signup to your first SDK call in five minutes.

Where to next

Language SDKs

Idiomatic Go, Python, and Node clients for the Ziptax API.

REST API Guides

Step-by-step walkthroughs for lookups by address, coordinates, or postal code.

Agents & LLMs

MCP server, Claude Skill, and OpenAPI resources for AI integrations.

API Reference

Explore every endpoint, parameter, and response schema.

Pricing & support

See zip.tax/pricing for plan options. Need help? Reach us at support@zip.tax.