Ziptax Sales Tax API

The Ziptax MCP Server gives AI agents and LLM-powered applications direct access to real-time U.S. and Canadian sales tax data. MCP is an open standard that lets AI applications securely connect to external tools and data sources. Once connected, your agent can:

- Look up sales and use tax rates by postal code, street address, or geographic coordinates.
- Retrieve jurisdiction-level tax breakdowns (state, county, city, and district).
- Query account usage metrics and quota information.

Every request must include a valid API key sent as an HTTP header. Two header methods are supported.

If both are present, theX-API-KEYheader takes priority. Do not pass your API key as a URL parameter; keys in URLs can end up in logs.

Look up sales and use tax rates for a U.S. or Canadian location. Provide a full street address for door-level precision, or alat/lngpair for a geographic point lookup. Returns tax rates broken down by jurisdiction (state, county, city, district).

Provide eitheraddressfor a door-level lookup, orlatandlngfor a geographic point lookup. The input schema declares this requirement as ananyOfconstraint.

The tool response mirrors the ZiptaxREST API by Addressresponse:

Add this block to yourclaude_desktop_config.json:

{ "mcpServers": { "ziptax": { "type": "http", "url": "https://mcp.zip-tax.com/", "headers": { "X-API-KEY": "your_api_key" } } } }

Navigate toSettings → MCPand add a new server with:

- Name:Ziptax MCP Server
- Type:HTTP
- URL:https://mcp.zip-tax.com/
- Headers:X-API-KEY: your_api_key

In Devin, add the Ziptax MCP integration from the MCP Marketplace, or configure it manually underSettings → MCP Marketplace → Add Your Own:

{ "mcpServers": { "ziptax-sales-tax-api": { "transport": "shttp", "url": "https://mcp.zip-tax.com/", "headers": { "X-API-KEY": "$ZIPTAX_API_KEY" } } } }

Store your API key as a secret namedZIPTAX_API_KEYin Devin's Secrets Manager.

Any MCP client that supports Streamable HTTP transport can connect:

- Name:Ziptax MCP Server
- Type:HTTP
- URL:https://mcp.zip-tax.com/
- Headers:X-API-KEY: your_api_key

When a request fails, the MCP Server returns an error message in the tool result. For the full list of API response codes, see theResponse Codesreference.

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