# NZ Data API (remote · nzdata.zakwins.workers.dev)

New Zealand public holidays, working-day deadlines, IRD/NZBN/bank checks, GST. Pay per call via x402

- Trust score: 74/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `nzdata.zakwins.workers.dev`: 74/100 (this document), [markdown](https://verifymcp.io/servers/dev-workers-zakwins-nzdata-nz-data-api/nzdata.md), [page](https://verifymcp.io/servers/dev-workers-zakwins-nzdata-nz-data-api/nzdata)

## Channel facts

- Endpoint: `https://nzdata.zakwins.workers.dev/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.1.0`

## 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 2026-11-05.

- **Endpoint Security**: 63/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Nothing on it is marked destructive, but we can't show that an anonymous caller can only read: full credit needs the server to list at least one tool and every tool to be verifiably read-only. We use a best-effort check of tool names and descriptions to tell read-only tools from tools that change things, so some genuinely read-only tools may not get full credit. Names that start with a read verb (get, list, read, search and similar) and accurate readOnlyHint annotations help. Meet that to earn full credit, or require authorisation.
  - HTTPS enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement.
  - 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**: 73/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 983 tokens (~122/item across 8 items; 8 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 57/100
  - Stability observed for 17 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 8 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 9 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 NZ Data API MCP server?

NZ Data API is a hosted endpoint at https://nzdata.zakwins.workers.dev/mcp, 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 dev-workers-zakwins-nzdata-nz-data-api 'https://nzdata.zakwins.workers.dev/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "dev-workers-zakwins-nzdata-nz-data-api": {
      "url": "https://nzdata.zakwins.workers.dev/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "dev-workers-zakwins-nzdata-nz-data-api": {
      "type": "http",
      "url": "https://nzdata.zakwins.workers.dev/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.dev-workers-zakwins-nzdata-nz-data-api]
url = "https://nzdata.zakwins.workers.dev/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "dev-workers-zakwins-nzdata-nz-data-api": {
      "type": "remote",
      "url": "https://nzdata.zakwins.workers.dev/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add dev-workers-zakwins-nzdata-nz-data-api --url 'https://nzdata.zakwins.workers.dev/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  dev-workers-zakwins-nzdata-nz-data-api:
    url: "https://nzdata.zakwins.workers.dev/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "dev-workers-zakwins-nzdata-nz-data-api": {
      "Transport": "http",
      "Url": "https://nzdata.zakwins.workers.dev/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add dev-workers-zakwins-nzdata-nz-data-api -t streamable-http -u 'https://nzdata.zakwins.workers.dev/mcp'
```

### Other

```json
{
  "mcpServers": {
    "dev-workers-zakwins-nzdata-nz-data-api": {
      "type": "http",
      "url": "https://nzdata.zakwins.workers.dev/mcp"
    }
  }
}
```

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.

### 2026-11-04 (score 74, +1)

No change was recorded against any check on this day. Stability & Change Management went from 50 to 53. That category is still filling its 30-day observation window: 15 days of observed history at the previous scan, 16 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-02 (score 73, +1)

No change was recorded against any check on this day. Stability & Change Management went from 43 to 47. That category is still filling its 30-day observation window: 13 days of observed history at the previous scan, 14 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-30 (score 72, +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.

### 2026-10-28 (score 71, +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.

### 2026-10-26 (score 70, +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.

### 2026-10-24 (score 69, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-22 (score 68, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-20 (score 67, +1)

- [functional improvement] Stability: unverified → 0.03

## MCP tools (8)

### `nz_holidays` (~106 tokens)

NZ public holidays 2022-2030 incl. Matariki, Mondayisation and optional regional anniversary day

NZ public holidays 2022-2030 incl. Matariki, Mondayisation and optional regional anniversary day. Paid tool: $0.002 USDC on Base per call via x402 (an unpaid call returns PaymentRequired; retry with _meta["x402/payment"]). Example args: {"year":"2026","region":"auckland"}

Input parameters:

- `region` (string): e.g. auckland
- `year` (string): e.g. 2026

### `nz_working_days` (~161 tokens)

Count NZ working days between two dates inclusive

Count NZ working days between two dates inclusive (weekends, public holidays, optional statutory Christmas shutdown presets oia|lgoima|building_act|rta). Paid tool: $0.002 USDC on Base per call via x402 (an unpaid call returns PaymentRequired; retry with _meta["x402/payment"]). Example args: {"start":"2026-10-01","end":"2026-10-31","region":"","preset":"none"}

Input parameters:

- `end` (string): e.g. 2026-10-31
- `preset` (string): e.g. none
- `region` (string): e.g. (empty)
- `start` (string): e.g. 2026-10-01

### `nz_working_days_add` (~127 tokens)

Add N NZ working days to a date

Add N NZ working days to a date (e.g. OIA 20 working-day deadline). Paid tool: $0.002 USDC on Base per call via x402 (an unpaid call returns PaymentRequired; retry with _meta["x402/payment"]). Example args: {"start":"2026-12-15","days":"20","preset":"oia"}

Input parameters:

- `days` (string): e.g. 20
- `preset` (string): e.g. oia
- `start` (string): e.g. 2026-12-15

### `nz_validate_ird` (~77 tokens)

Validate NZ IRD/GST number check digit

Validate NZ IRD/GST number check digit. Paid tool: $0.001 USDC on Base per call via x402 (an unpaid call returns PaymentRequired; retry with _meta["x402/payment"]). Example args: {"number":"49091850"}

Input parameters:

- `number` (string): e.g. 49091850

### `nz_validate_nzbn` (~84 tokens)

Validate NZBN

Validate NZBN (GTIN-13) check digit. Paid tool: $0.001 USDC on Base per call via x402 (an unpaid call returns PaymentRequired; retry with _meta["x402/payment"]). Example args: {"number":"9429041535134"}

Input parameters:

- `number` (string): e.g. 9429041535134

### `nz_validate_phone` (~87 tokens)

Validate and normalise an NZ phone number to E.164 with type

Validate and normalise an NZ phone number to E.164 with type. Paid tool: $0.001 USDC on Base per call via x402 (an unpaid call returns PaymentRequired; retry with _meta["x402/payment"]). Example args: {"number":"021 123 4567"}

Input parameters:

- `number` (string): e.g. 021 123 4567

### `nz_validate_bank` (~112 tokens)

Validate an NZ bank account number check digit

Validate an NZ bank account number check digit (IRD algorithms A-G/X), normalise BB-bbbb-AAAAAAA-SSS and identify the bank code. Paid tool: $0.001 USDC on Base per call via x402 (an unpaid call returns PaymentRequired; retry with _meta["x402/payment"]). Example args: {"number":"01-0902-0068389-00"}

Input parameters:

- `number` (string): e.g. 01-0902-0068389-00

### `nz_gst` (~88 tokens)

NZ GST 15% calculator

NZ GST 15% calculator (exclusive or inclusive). Paid tool: $0.001 USDC on Base per call via x402 (an unpaid call returns PaymentRequired; retry with _meta["x402/payment"]). Example args: {"amount":"115","mode":"inclusive"}

Input parameters:

- `amount` (string): e.g. 115
- `mode` (string): e.g. inclusive

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/dev-workers-zakwins-nzdata-nz-data-api/nzdata#diagnostics

## Score history

- 2026-11-05: 74
- 2026-11-04: 74
- 2026-11-03: 73
- 2026-11-02: 73
- 2026-11-01: 72
- 2026-10-31: 72
- 2026-10-30: 72
- 2026-10-29: 71
- 2026-10-28: 71
- 2026-10-27: 70
- 2026-10-26: 70
- 2026-10-25: 69
- 2026-10-24: 69
- 2026-10-23: 68
- 2026-10-22: 68
- 2026-10-21: 67
- 2026-10-20: 67
- 2026-10-19: 66

## Common questions

### What is the NZ Data API MCP server?

NZ Data API is an MCP server listed in the public MCP registry as dev.workers.zakwins.nzdata/nz-data-api. New Zealand public holidays, working-day deadlines, IRD/NZBN/bank checks, GST. Pay per call via x402. This page covers its hosted endpoint (https://nzdata.zakwins.workers.dev/mcp).

### Is the NZ Data API MCP server safe to use?

NZ Data API scores 74 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 NZ Data API MCP server expose?

NZ Data API exposes 8 tools: nz_holidays, nz_working_days, nz_working_days_add, nz_validate_ird, nz_validate_nzbn, and 3 more. Their descriptions and schemas cost roughly 842 tokens of context every time the server is loaded.

### Does the NZ Data API MCP server require authentication?

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

### Is the NZ Data API MCP server still maintained?

NZ Data API is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What did VerifyMCP test on the NZ Data API MCP server?

VerifyMCP ran 12 checks on NZ Data API, covering TLS certificate, Authorization, HSTS header, DNSSEC and 8 more. One item could not be completed, a gap on our side rather than a finding about NZ Data API: HTTPS. Supply Chain Security and Provenance & Transparency do not apply to a hosted endpoint, so they were not tested. The score does not measure everything, and the scoring documentation lists what it leaves out.

## Links

- Remote endpoint: https://nzdata.zakwins.workers.dev/mcp
- Website: https://nzdata.zakwins.workers.dev/llms.txt
- Changelog RSS feed: https://verifymcp.io/servers/dev-workers-zakwins-nzdata-nz-data-api/nzdata.xml
- Changelog JSON feed: https://verifymcp.io/servers/dev-workers-zakwins-nzdata-nz-data-api/nzdata/changelog.json
- Trust report (JSON): https://verifymcp.io/servers/dev-workers-zakwins-nzdata-nz-data-api/nzdata.json
- HTML version of this page: https://verifymcp.io/servers/dev-workers-zakwins-nzdata-nz-data-api/nzdata