# Ziptax Sales Tax API (remote · mcp.zip-tax.com)

Real-time US and Canadian sales and use tax rates by address or geo coordinates.

- Trust score: 77/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-22

## Components

- remote · `mcp.zip-tax.com`: 77/100 (this document), [markdown](https://verifymcp.io/servers/tax-zip-ziptax/mcp-2.md), [page](https://verifymcp.io/servers/tax-zip-ziptax/mcp-2)

## Channel facts

- Endpoint: `https://mcp.zip-tax.com/`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.5`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-22.

- **Endpoint Security**: 74/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 67/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 525 tokens (~262/item across 2 items; 2 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 53/100
  - Stability observed for 16 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 2 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 3 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Ziptax Sales Tax API MCP server?

Ziptax Sales Tax API is a hosted endpoint at https://mcp.zip-tax.com/, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http tax-zip-ziptax 'https://mcp.zip-tax.com/'
```

### Cursor

```json
{
  "mcpServers": {
    "tax-zip-ziptax": {
      "url": "https://mcp.zip-tax.com/"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "tax-zip-ziptax": {
      "type": "http",
      "url": "https://mcp.zip-tax.com/"
    }
  }
}
```

### Codex

```toml
[mcp_servers.tax-zip-ziptax]
url = "https://mcp.zip-tax.com/"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "tax-zip-ziptax": {
      "type": "remote",
      "url": "https://mcp.zip-tax.com/",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add tax-zip-ziptax --url 'https://mcp.zip-tax.com/' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  tax-zip-ziptax:
    url: "https://mcp.zip-tax.com/"
```

### Netclaw

```json
{
  "McpServers": {
    "tax-zip-ziptax": {
      "Transport": "http",
      "Url": "https://mcp.zip-tax.com/"
    }
  }
}
```

### Vellum

```bash
assistant mcp add tax-zip-ziptax -t streamable-http -u 'https://mcp.zip-tax.com/'
```

### Other

```json
{
  "mcpServers": {
    "tax-zip-ziptax": {
      "type": "http",
      "url": "https://mcp.zip-tax.com/"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-21 (score 77, +1)

No change was recorded against any check on this day. Stability & Change Management went from 47 to 50. That category is still filling its 30-day observation window: 14 days of observed history at the previous scan, 15 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-19 (score 76, +1)

No change was recorded against any check on this day. Stability & Change Management went from 40 to 43. That category is still filling its 30-day observation window: 12 days of observed history at the previous scan, 13 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-17 (score 75, +1)

No change was recorded against any check on this day. Stability & Change Management went from 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-15 (score 74, +1)

No change was recorded against any check on this day. Stability & Change Management went from 27 to 30. That category is still filling its 30-day observation window: 8 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-13 (score 73, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-12 (score 72, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 20. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 6 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-09 (score 71)

First indexed and scored.

## MCP tools (2)

### `get_account_metrics` (~64 tokens)

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

### `lookup_tax_rate` (~405 tokens)

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 sent in the X-API-KEY header or Authorization header. Get a key at https://platform.zip.tax

Input parameters:

- `address` (string): Full street address for door-level geocoded lookup. Preferred input
- `adjustment` (string): Set to 'auto' to enable state-specific unincorporated area adjustments
- `city` (string): City name
- `country_code` (string): Country code: US (default) or CA for Canada. CA requires a Pro or Enterprise plan
- `county` (string): County name
- `format` (string): Response format: 'json' (default) or 'xml'
- `historical` (string): 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
- `lat` (string): Latitude for coordinate-based lookup. Same door-level precision as an address
- `lng` (string): Longitude for coordinate-based lookup. Same door-level precision as an address
- `postalcode` (string): 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 w…
- `sat_item_total` (string): Item total for Tennessee Single Article Tax calculation
- `state` (string): Two-letter US state or Canadian province code (e.g., CA, ON)
- `taxability_code` (string): Product taxability code (TIC) for product-specific tax rules. Requires a Pro or Enterprise plan

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/tax-zip-ziptax/mcp-2#diagnostics

## Score history

- 2026-10-22: 77
- 2026-10-21: 77
- 2026-10-20: 76
- 2026-10-19: 76
- 2026-10-18: 75
- 2026-10-17: 75
- 2026-10-16: 74
- 2026-10-15: 74
- 2026-10-14: 73
- 2026-10-13: 73
- 2026-10-12: 72
- 2026-10-10: 71
- 2026-10-09: 71

## Common questions

### What is the Ziptax Sales Tax API MCP server?

Ziptax Sales Tax API is an MCP server listed in the public MCP registry as tax.zip/ziptax. Real-time US and Canadian sales and use tax rates by address or geo coordinates. This page covers its hosted endpoint (https://mcp.zip-tax.com/).

### Is the Ziptax Sales Tax API MCP server safe to use?

Ziptax Sales Tax API scores 77 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Ziptax Sales Tax API MCP server expose?

Ziptax Sales Tax API exposes 2 tools: get_account_metrics, lookup_tax_rate. Their descriptions and schemas cost roughly 469 tokens of context every time the server is loaded.

### Does the Ziptax Sales Tax API MCP server require authentication?

No. We connected to Ziptax Sales Tax API without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Ziptax Sales Tax API MCP server still maintained?

Ziptax Sales Tax API is still listed as active in the MCP registry. We last reached this channel on 22 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://mcp.zip-tax.com/
- Authorisation metadata: https://mcp.zip-tax.com/.well-known/oauth-protected-resource
- Repository: https://github.com/ZipTax/ziptax-mcp
- Website: https://docs.zip.tax/guides/agents-and-llms/mcp-server
- Changelog RSS feed: https://verifymcp.io/servers/tax-zip-ziptax/mcp-2.xml
- Changelog JSON feed: https://verifymcp.io/servers/tax-zip-ziptax/mcp-2.json
- HTML version of this page: https://verifymcp.io/servers/tax-zip-ziptax/mcp-2