# io.github.physics-star-cat/databutler-tax (remote · databutler.dev)

Take-home pay after tax and social contributions for nine countries, with tax year.

- Trust score: 33/100 (low)
- Change this week: −48
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `databutler.dev`: 33/100 (this document), [markdown](https://verifymcp.io/servers/physics-star-cat-databutler-tax/api-mcp-tax.md), [page](https://verifymcp.io/servers/physics-star-cat-databutler-tax/api-mcp-tax)

## Channel facts

- Endpoint: `https://databutler.dev/api/mcp/tax`
- Transports: `streamable-http`
- Auth: `required (not validated)`
- Version: `1.0.0`

## 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**: 83/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - The endpoint enforces authorisation, but returns a challenge with no valid RFC 9728 metadata, so a client cannot discover where to get a token.
  - 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**: 0/100
  - Transport blocked by authentication: the endpoint requires auth we don't have to verify streamable-http.
- **Schema Quality & AI Usability**: 0/100
  - Schema blocked by authentication: the endpoint requires auth we don't have to read it.
- **Stability & Change Management**: 0/100
  - Stability not yet verified: not enough scan history yet (needs a 30-day window).
- **Tool Coverage**: 0/100
  - Tool coverage blocked by authentication: the endpoint requires auth we don't have to read its tools.
- **Tool Safety**: 0/100
  - Tool safety blocked by authentication: the endpoint requires auth we don't have to read its tools.
- **Capabilities**: 0/100
  - Capabilities blocked by authentication: the endpoint requires auth we don't have to read them.

**Unverified: 6 categories.** Categories scored 0 because we could not verify them: authentication we do not have, an unreachable endpoint, or not enough scan history. We only credit what we can confirm.

## Install

### How do I install the io.github.physics-star-cat/databutler-tax MCP server?

io.github.physics-star-cat/databutler-tax is a hosted endpoint at https://databutler.dev/api/mcp/tax, 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 physics-star-cat-databutler-tax 'https://databutler.dev/api/mcp/tax'
```

### Cursor

```json
{
  "mcpServers": {
    "physics-star-cat-databutler-tax": {
      "url": "https://databutler.dev/api/mcp/tax"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "physics-star-cat-databutler-tax": {
      "type": "http",
      "url": "https://databutler.dev/api/mcp/tax"
    }
  }
}
```

### Codex

```toml
[mcp_servers.physics-star-cat-databutler-tax]
url = "https://databutler.dev/api/mcp/tax"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "physics-star-cat-databutler-tax": {
      "type": "remote",
      "url": "https://databutler.dev/api/mcp/tax",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add physics-star-cat-databutler-tax --url 'https://databutler.dev/api/mcp/tax' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  physics-star-cat-databutler-tax:
    url: "https://databutler.dev/api/mcp/tax"
```

### Netclaw

```json
{
  "McpServers": {
    "physics-star-cat-databutler-tax": {
      "Transport": "http",
      "Url": "https://databutler.dev/api/mcp/tax"
    }
  }
}
```

### Vellum

```bash
assistant mcp add physics-star-cat-databutler-tax -t streamable-http -u 'https://databutler.dev/api/mcp/tax'
```

### Other

```json
{
  "mcpServers": {
    "physics-star-cat-databutler-tax": {
      "type": "http",
      "url": "https://databutler.dev/api/mcp/tax"
    }
  }
}
```

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.

### 2026-11-01 (score 33, −49)

- [security regression] Endpoint reachability: reachable → behind authorisation
- [security regression] Tool safety: pass → unverified
- [security regression] Transport: pass → unverified
- [security regression] Stability: 0.90 → unverified
- [security regression] Authorization: partial → fail
- [security regression] HSTS header: pass → fail
- [functional regression] Capabilities: pass → unverified
- [functional regression] Tool coverage: 100 → unverified
- [functional] First check of Schema quality: unverified

### 2026-10-31 (score 82, +1)

No change was recorded against any check on this day. Stability & Change Management went from 87 to 90. That category is still filling its 30-day observation window: 26 days of observed history at the previous scan, 27 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-29 (score 81, +1)

No change was recorded against any check on this day. Stability & Change Management went from 80 to 83. That category is still filling its 30-day observation window: 24 days of observed history at the previous scan, 25 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-27 (score 80, 0)

- [security] The server rewrote its instructions, which are the text every model session reads
- [security] Tool “take_home_pay” rewrote its description, which is the text the model reads
- [cosmetic] “take_home_pay” reworded the description of “region”

### 2026-10-26 (score 80, +1)

No change was recorded against any check on this day. Stability & Change Management went from 70 to 73. That category is still filling its 30-day observation window: 21 days of observed history at the previous scan, 22 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-24 (score 79, +1)

No change was recorded against any check on this day. Stability & Change Management went from 63 to 67. That category is still filling its 30-day observation window: 19 days of observed history at the previous scan, 20 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-22 (score 78, +1)

No change was recorded against any check on this day. Stability & Change Management went from 57 to 60. That category is still filling its 30-day observation window: 17 days of observed history at the previous scan, 18 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-20 (score 77, +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.

## MCP tools (1)

### `take_home_pay` (~369 tokens)

Take-home pay

Net salary after income tax and social contributions for an employee in one of ten countries (uk, us, ca, au, in, br, pl, fr, de, es), computed live by the LifeByNumbers salary calculators (same operator). Takes a gross salary in local currency (annual by default, or monthly with period) and a country code, plus optional state and filingStatus for the US, province for Canada, region (england|scotland) for the UK and region (madrid|cataluna) for Spain. Returns gross, net and total deductions (each annual and monthly), a line-by-line breakdown typed as tax / social / contribution / repayment, effectiveRate, the tax year the figures apply to, currency, the assumptions behind the estimate and the upstream calculator page as source.

Input parameters:

- `country` (string, required): ISO 3166-1 alpha-2, lower case: uk, us, ca, au, in, br, pl, fr, de, es
- `filingStatus` (string): US only (default single)
- `gross` (number, required): gross salary in local currency, annual unless period is monthly, e.g. 50000
- `period` (string): period of gross (default annual); results always give both annual and monthly
- `province` (string): Canada only: two-letter province/territory code, e.g. BC (default ON)
- `region` (string): UK: england | scotland | wales | northern-ireland (scotland applies Scottish income tax bands; default england). Spain: madrid | cataluna, the autonomous community whose IRPF scale applies (default m…
- `state` (string): US only: two-letter state code, e.g. TX (default CA)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/physics-star-cat-databutler-tax/api-mcp-tax#diagnostics

## Score history

- 2026-11-05: 33
- 2026-11-04: 33
- 2026-11-03: 33
- 2026-11-02: 33
- 2026-11-01: 33
- 2026-10-31: 82
- 2026-10-30: 81
- 2026-10-29: 81
- 2026-10-28: 80
- 2026-10-27: 80
- 2026-10-26: 80
- 2026-10-25: 79
- 2026-10-24: 79
- 2026-10-23: 78
- 2026-10-22: 78
- 2026-10-21: 77
- 2026-10-20: 77
- 2026-10-19: 76
- 2026-10-18: 76
- 2026-10-17: 75
- 2026-10-16: 75
- 2026-10-15: 75
- 2026-10-14: 75
- 2026-10-13: 74
- 2026-10-12: 74
- 2026-10-10: 73
- 2026-10-09: 73
- 2026-10-05: 71
- 2026-10-04: 70

## Common questions

### What is the io.github.physics-star-cat/databutler-tax MCP server?

io.github.physics-star-cat/databutler-tax is an MCP server listed in the public MCP registry as io.github.physics-star-cat/databutler-tax. Take-home pay after tax and social contributions for nine countries, with tax year. This page covers its hosted endpoint (https://databutler.dev/api/mcp/tax).

### Is the io.github.physics-star-cat/databutler-tax MCP server safe to use?

io.github.physics-star-cat/databutler-tax scores 33 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 io.github.physics-star-cat/databutler-tax MCP server expose?

io.github.physics-star-cat/databutler-tax exposes 1 tool: take_home_pay. Their descriptions and schemas cost roughly 369 tokens of context every time the server is loaded.

### Does the io.github.physics-star-cat/databutler-tax MCP server require authentication?

Yes. io.github.physics-star-cat/databutler-tax asked us for credentials when we connected, so you will need to authorise it in your MCP client before it can do anything.

### Is the io.github.physics-star-cat/databutler-tax MCP server still maintained?

io.github.physics-star-cat/databutler-tax 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.

## Links

- Remote endpoint: https://databutler.dev/api/mcp/tax
- Repository: https://github.com/physics-star-cat/databutler
- Website: https://databutler.dev/api
- Changelog RSS feed: https://verifymcp.io/servers/physics-star-cat-databutler-tax/api-mcp-tax.xml
- Changelog JSON feed: https://verifymcp.io/servers/physics-star-cat-databutler-tax/api-mcp-tax.json
- HTML version of this page: https://verifymcp.io/servers/physics-star-cat-databutler-tax/api-mcp-tax