# Travel Per Diem & Allowance Calculator (remote · syntropicapi.com)

Compliant per diems in one call: official US GSA, German BMF and UK HMRC rates, with a trip…

- Trust score: 73/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-27

## Components

- remote · `syntropicapi.com`: 73/100 (this document), [markdown](https://verifymcp.io/servers/com-syntropicapi-travel-per-diem/mcp-travel-per-diem-mcp.md), [page](https://verifymcp.io/servers/com-syntropicapi-travel-per-diem/mcp-travel-per-diem-mcp)

## Channel facts

- Endpoint: `https://syntropicapi.com/mcp/travel-per-diem/mcp`
- Transports: `streamable-http`
- Auth: `required`
- 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 2026-09-27.

- **Endpoint Security**: 83/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation is enforced on tool calls, but the challenge carries 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**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 65/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 808 tokens (~202/item across 4 items; 4 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 0/100
  - Stability not yet verified: not enough scan history yet (needs a 30-day window).
- **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.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 4 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

**Unverified: 1 category.** A category scored 0 because we could not verify it: 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 Travel Per Diem & Allowance Calculator MCP server?

Travel Per Diem & Allowance Calculator is a hosted endpoint at https://syntropicapi.com/mcp/travel-per-diem/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 com-syntropicapi-travel-per-diem 'https://syntropicapi.com/mcp/travel-per-diem/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "com-syntropicapi-travel-per-diem": {
      "url": "https://syntropicapi.com/mcp/travel-per-diem/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "com-syntropicapi-travel-per-diem": {
      "type": "http",
      "url": "https://syntropicapi.com/mcp/travel-per-diem/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.com-syntropicapi-travel-per-diem]
url = "https://syntropicapi.com/mcp/travel-per-diem/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-syntropicapi-travel-per-diem": {
      "type": "remote",
      "url": "https://syntropicapi.com/mcp/travel-per-diem/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add com-syntropicapi-travel-per-diem --url 'https://syntropicapi.com/mcp/travel-per-diem/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-syntropicapi-travel-per-diem:
    url: "https://syntropicapi.com/mcp/travel-per-diem/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "com-syntropicapi-travel-per-diem": {
      "Transport": "http",
      "Url": "https://syntropicapi.com/mcp/travel-per-diem/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add com-syntropicapi-travel-per-diem -t streamable-http -u 'https://syntropicapi.com/mcp/travel-per-diem/mcp'
```

### Other

```json
{
  "mcpServers": {
    "com-syntropicapi-travel-per-diem": {
      "type": "http",
      "url": "https://syntropicapi.com/mcp/travel-per-diem/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.

### 2026-09-27 (score 73)

First indexed and scored.

## MCP tools (4)

### `get_per_diem_rates` (~237 tokens)

Get Per Diem Rates

Returns the lodging and meal allowance for one location under one regime, with the regime's breakdown
(BMF meal deductions, GSA M&IE breakdown and seasons, HMRC meal/room rates), fallbacks applied, source citation
and data freshness. us-gsa picks the fiscal year by date (FY2026: 2025-10-01..2026-09-30, FY2027: 2026-10-01..2027-09-30).

Input parameters:

- `city`: City; unlisted cities fall back per the regime's rules
- `country`: ISO alpha-2 code or English/German name. Default: DE for de-bmf, US for us-gsa
- `date`: Travel date (ISO 8601). Default: today (UTC)
- `postal_code`: US ZIP (us-gsa) or French postcode (de-bmf)
- `regime` (string, required): de-bmf (Germany), us-gsa (US CONUS) or uk-hmrc (UK overseas scale rates)
- `state`: US state code (us-gsa)

Output parameters:

- `currency` (string): ISO 4217 currency of the summary fields
- `date` (string): Date the rate applies to
- `de_bmf`: de-bmf breakdown (only for regime de-bmf)
- `disclaimer` (string): Informational use only, not tax advice
- `location` (object): The location that was resolved from the input
- `lodging` (number): Per-night lodging figure (BMF flat rate, GSA maximum, HMRC room rate)
- `meals_full_day` (number): Meals allowance for a full day (BMF 24 h rate, GSA M&IE, HMRC 24-hour rate)
- `meals_partial_day` (number): Reduced day (BMF arrival/departure/>8 h, GSA 75 % first/last day, HMRC over-10-hours)
- `notes` (array): Fallbacks and caveats that applied
- `other_locations` (array): Other listed locations in the same country for this regime
- `regime` (string): Regime the rate comes from
- `source` (object): Official publication the rate comes from
- `uk_hmrc`: uk-hmrc breakdown (only for regime uk-hmrc)
- `us_gsa`: us-gsa breakdown (only for regime us-gsa)

### `calculate_trip_allowance` (~390 tokens)

Calculate Trip Allowance

Applies the regime's rules to an itinerary and returns one line per allowance, deduction and night, each with
the rule it applied, plus totals.

\- de-bmf: >8 h one-day trips (last place of work), partial arrival/departure days, full days at the place reached
  before midnight, higher rate on a home stop-over day, 20 %/40 % meal deductions of that day's full-day rate
  (never below 0), Übernachtungspauschale per night. The three-month rule is not applied.
\- us-gsa: 75 % M&IE on first and last day, M&IE of the lodging location, last day at the last TDY location, 75 % for
  12-24 h trips without lodging, full meal-amount deductions with an incidentals floor, max lodging per night by season.
\- uk-hmrc: 24-hour periods from arrival abroad, over-5/over-10-hour rates for the remainder, room rate per night,
  provided meals deducted at the HMRC meal rate of the location at 08:00 / 13:00 / 19:00 that day.

Input parameters:

- `leave_home`: When the traveller leaves home / the first place of work (de-bmf, us-gsa). Default: first arrive
- `legs` (array, required): Destinations in chronological order (1-20)
- `lodging_provided` (boolean): Lodging paid directly by the employer: no lodging lines
- `meals_provided` (array): Meals provided by employer/host
- `overnight` (boolean): False for a trip across midnight without an overnight stay (de-bmf/us-gsa: combine hours)
- `regime` (string, required): Which rule set to apply
- `return_home`: When the traveller is back home. Default: last depart

Output parameters:

- `currency`: Currency of total, if the trip has a single currency
- `days` (integer): Calendar days touched by the trip
- `deductions_total`: Meal deductions, negative (single-currency trips, else null)
- `disclaimer` (string): Informational use only, not tax advice
- `lines` (array): One line per day/period, deduction and night, each with its rule
- `lodging_total`: Lodging total (single-currency trips, else null)
- `meals_total`: Meal allowances before deductions (single-currency trips, else null)
- `notes` (array): Assumptions and caveats that applied
- `regime` (string): Regime applied
- `sources` (array): Official publications used
- `total`: Grand total (null if several currencies are involved; see totals)
- `totals` (array): Totals per currency

### `list_per_diem_regimes` (~44 tokens)

List Per Diem Regimes

Lists the available regimes with validity periods, snapshot dates, sources and the rules the trip calculator
applies, plus regimes that are planned but not yet available.

Output parameters:

- `disclaimer` (string): Informational use only, not tax advice
- `regimes` (array): All regimes, available and planned

### `search_per_diem_locations` (~137 tokens)

Search Per Diem Locations

Lists the locations with their own rate in a regime (us-gsa: current fiscal-year destinations), filtered by text,
country or state. Use the returned country/city/state values in /rates and /trip.

Input parameters:

- `country`: Only this country (ISO alpha-2 or name)
- `limit` (integer): Maximum items to return
- `offset` (integer): Items to skip
- `q`: Case- and accent-insensitive text search over city, country, state, county and aliases
- `regime` (string, required): Regime to search
- `state`: Only this US state (us-gsa)

Output parameters:

- `items` (array): Matching locations (after limit/offset)
- `regime` (string): Regime searched
- `total` (integer): Number of matching locations before limit/offset

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/com-syntropicapi-travel-per-diem/mcp-travel-per-diem-mcp#diagnostics

## Score history

- 2026-09-27: 73

## Common questions

### What is the Travel Per Diem & Allowance Calculator MCP server?

Travel Per Diem & Allowance Calculator is an MCP server listed in the public MCP registry as com.syntropicapi/travel-per-diem. Compliant per diems in one call: official US GSA, German BMF and UK HMRC rates, with a trip… This page covers its hosted endpoint (https://syntropicapi.com/mcp/travel-per-diem/mcp).

### Is the Travel Per Diem & Allowance Calculator MCP server safe to use?

Travel Per Diem & Allowance Calculator scores 73 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 Travel Per Diem & Allowance Calculator MCP server expose?

Travel Per Diem & Allowance Calculator exposes 4 tools: get_per_diem_rates, calculate_trip_allowance, list_per_diem_regimes, search_per_diem_locations. Their descriptions and schemas cost roughly 808 tokens of context every time the server is loaded.

### Does the Travel Per Diem & Allowance Calculator MCP server require authentication?

Yes. Travel Per Diem & Allowance Calculator 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 Travel Per Diem & Allowance Calculator MCP server still maintained?

Travel Per Diem & Allowance Calculator is still listed as active in the MCP registry. We last reached this channel on 27 September 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://syntropicapi.com/mcp/travel-per-diem/mcp
- Authorisation metadata: https://syntropicapi.com/.well-known/oauth-protected-resource/mcp/travel-per-diem/mcp
- Website: https://syntropicapi.com/apis/travel-per-diem
- Changelog RSS feed: https://verifymcp.io/servers/com-syntropicapi-travel-per-diem/mcp-travel-per-diem-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-syntropicapi-travel-per-diem/mcp-travel-per-diem-mcp.json
- HTML version of this page: https://verifymcp.io/servers/com-syntropicapi-travel-per-diem/mcp-travel-per-diem-mcp