Ziptax Sales Tax API
REMOTE · MCP.ZIP-TAX.COM
Real-time US and Canadian sales and use tax rates by address or geo coordinates.
Available components
Last scanned (21 hours ago)
Scores higher than 74% of remote servers
Reachable. Last reached 22 Oct 2026.
Category Finance and Payments
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. How we score → Why this is hard to score →
Endpoint Security74
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability67
- AI-judged instruction clarity (excellent).Pass
- 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. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management53
- Stability observed for 16 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 2 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 3 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 21 Oct 26 +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.
- 19 Oct 26 +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.
- 17 Oct 26 +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.
- 15 Oct 26 +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.
- 13 Oct 26 +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.
- 12 Oct 26 +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.
- 9 Oct 26 71
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 22 Oct 2026 · Probed https://mcp.zip-tax.com/
TLS valid
Negotiated TLS 1.2 with TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=mcp.zip-tax.com | CN=Amazon RSA 2048 M04,O=Amazon,C=US | 13 Aug 2026 | 26 Feb 2027 | RSA 2048 | SHA256-RSA | 7b0471eb158f891b6a5205f2f22c189 |
| SANs: mcp.zip-tax.com | ||||||
| CN=Amazon RSA 2048 M04,O=Amazon,C=US (CA) | CN=Amazon Root CA 1,O=Amazon,C=US | 23 Aug 2022 | 23 Aug 2030 | RSA 2048 | SHA256-RSA | 773124f2a952e3ed18a58bdb85d1bc0ce5f27 |
| CN=Amazon Root CA 1,O=Amazon,C=US (CA) | CN=Starfield Services Root Certificate Authority - G2,O=Starfield Technologies\, Inc.,L=Scottsdale,ST=Arizona,C=US | 25 May 2015 | 31 Dec 2037 | RSA 2048 | SHA256-RSA | 67f944a2a27cdf3fac2ae2b01f908eeb9c4c6 |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of mcp.zip-tax.com. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| zip-tax.com. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://mcp.zip-tax.com/ | Verified | 200 | |
| http (plaintext) | http://mcp.zip-tax.com/ | HTTPS enforced | 301 | https://mcp.zip-tax.com:443/ |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
get_account_metrics ~64
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
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
lookup_tax_rate ~405
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
| Name | Type | Req | Description |
|---|---|---|---|
| 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 |
No output schema declared.
No examples provided.
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.
remote · mcp.zip-tax.com
claude mcp add --transport http tax-zip-ziptax 'https://mcp.zip-tax.com/'
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.