Ziptax Sales Tax API

ziptax/ziptax-mcp

Connects to the zip.tax API over SSE to retrieve real-time US and Canadian sales tax rates. Exposes operations for calculating tax by street address or coordinates, normalizing addresses through USPS, and getting geolocation data. You'd reach for this when building e-commerce checkouts, invoicing systems, or any application that needs to collect accurate sales tax at transaction time. The underlying API handles the complexity of jurisdiction-specific rates and stays current with regulatory changes, so you don't have to maintain tax tables yourself. Built by the zip.tax team with code samples available in Go, Python, Node.js, and Scala.

tools: 2
auth: Secret needed
transport: HTTP
last updated: Oct 7, 2026

View on GitHub

Install

From registry metadata

$ npx add-mcp https://mcp.zip-tax.com/ --name ziptax --header 'X-API-KEY: ${X_API_KEY}'

Run in your terminal. add-mcp asks which agents to add it to, then asks for each value it needs. Add -g to install it for every project.

Review the command, arguments and environment values before installing. MCP servers run with your local permissions.

Other ways

Claude Code

$ claude mcp add --transport http ziptax https://mcp.zip-tax.com/ --header 'X-API-KEY: YOUR_X_API_KEY'

Run in your terminal. Add --scope user to make it available in every project.

Tools

Verified live · 2 tools

Verified live against the running server on Nov 6, 2026.

get_account_metricsGet account usage metrics and quota information for the authenticated ZipTax account. Returns current request counts, limits, and entitlements. Requires a valid ZipTax API key sent in the X-API-KEY header or Authorization header. Get a key at https://platform.zip.tax

Get account usage metrics and quota information for the authenticated ZipTax account. Returns current request counts, limits, and entitlements. Requires a valid ZipTax API key sent in the X-API-KEY header or Authorization header. Get a key at https://platform.zip.tax

No parameters. Call it with no arguments.

lookup_tax_rateLook up sales and use tax rates for a US or Canadian location. Provide a full street address for door-level accuracy, or a lat/lng pair for a geographic point lookup. Returns tax rates broken down by jurisdiction (state, county, city, district). Requires a valid ZipTax API key...13 params

Look up sales and use tax rates for a US or Canadian location. Provide a full street address for door-level accuracy, or a lat/lng pair for a geographic point lookup. Returns tax rates broken down by jurisdiction (state, county, city, district). Requires a valid ZipTax API key...

Parameters* required

addressstring

Full street address for door-level geocoded lookup. Preferred input

adjustmentstring

Set to 'auto' to enable state-specific unincorporated area adjustments

citystring

City name

country_codestring

Country code: US (default) or CA for Canada. CA requires a Pro or Enterprise plan

countystring

County name

formatstring

Response format: 'json' (default) or 'xml'

historicalstring

Historical period in YYYYMM format (e.g., 202601 for January 2026); lookback is limited to the past 12 months. Requires a Pro or Enterprise plan

latstring

Latitude for coordinate-based lookup. Same door-level precision as an address

lngstring

Longitude for coordinate-based lookup. Same door-level precision as an address

postalcodestring

US ZIP code (5-digit) or Canadian postal code. Least precise option: returns every rate overlapping the ZIP rather than one authoritative rate, with no adjustment for unincorporated areas. Use only...

sat_item_totalstring

Item total for Tennessee Single Article Tax calculation

statestring

Two-letter US state or Canadian province code (e.g., CA, ON)

taxability_codestring

Product taxability code (TIC) for product-specific tax rules. Requires a Pro or Enterprise plan

Readme

Ziptax MCP Server

An HTTP Model Context Protocol (MCP) server that gives AI agents real-time US and Canadian sales and use tax rates from the Ziptax API.

Once connected, an agent can:

Look up sales and use tax rates by street address, latitude/longitude, or postal code.
Get jurisdiction-level breakdowns (state, county, city, and district).
Check account usage and quota.

Official documentation: docs.zip.tax: MCP Server

Connection Details


Endpoint	`https://mcp.zip-tax.com/`
Method	`POST`
Transport	Streamable HTTP (most clients call this `HTTP`)
Sessions	Stateless
Server name	`ZipTax Sales Tax API`
Upstream API	Ziptax API `v60`

Authentication

Send a Ziptax API key as an HTTP header. Two header methods are supported:

X-API-KEY: your-api-key

Authorization: Bearer your-api-key

View the full README on GitHub

Details

Repository: github.com/ziptax/ziptax-mcp
Website: docs.zip.tax/guides/agents-and-llms/mcp-server
Category: Sales & Marketing
Transport: HTTP
Auth: Required
Registry: MCP registry, active
Tools verified: Nov 6, 2026

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