Databutler Facts MCP Server

by physics-star-cat Your server? Claim it

answering

Databutler Facts is answering right now. Last checked 6 min ago. It exposes 3 tools. Last commit 15 Oct 2026.

Official thresholds, rates and fees by key, with source, verified date and signature.

Uptime history 70 hours of history · worst hour 0%

70 hours agonow

78.3%

Uptime 24h

72 of 92 checks

Tools

read from the server

257 ms

Response time

average over 24h

Stars

last commit 15 Oct 2026

What the code does

We read the source, 23 h ago · tools taken from the live server · rules ccca72095570

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Builds a file path from a variable api/_areas.js:131

  const src = fs.readFileSync(path.join(dir, file), 'utf8');

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 6 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add databutler-facts --transport http https://databutler.dev/api/mcp/facts

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "databutler-facts": {
      "url": "https://databutler.dev/api/mcp/facts"
    }
  }
}

~/.codex/config.toml

[mcp_servers.databutler-facts]
url = "https://databutler.dev/api/mcp/facts"

.cursor/mcp.json

{
  "mcpServers": {
    "databutler-facts": {
      "url": "https://databutler.dev/api/mcp/facts"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "databutler-facts": {
      "url": "https://databutler.dev/api/mcp/facts"
    }
  }
}

Available tools 3

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

fact

get_fact

The current value of one official figure by key — a tax threshold, rate, allowance, fee, deadline, limit or policy rate — with the date it was verified, the official source URL, the period it applies to and a signature. Keys are `<country>/<topic>/<fact>`, e.g. `uk/income-tax/personal-allowance`, `uk/national-insurance/primary-threshold`, `us/social-security/wage-base`, `de/income-tax/grundfreibetrag`, `uk/bank-rate`, `eu/ecb/deposit-facility`, `uk/gov/passport-renewal-adult/fee-online-uk`. A loose key is resolved when unambiguous; otherwise the answer lists candidate keys. `max_age` (e.g. `30d`) marks the answer `stale` when the verification is older than that. Several keys separated by commas return a batch. Covers UK, US and German rates and thresholds, UK vehicle tax and MOT rules, UK government service fees, UK exam dates and central-bank policy rates; `coverage` lists the rest.

resolve

resolve_fact

Ranked canonical fact keys for a plain-language question or a guessed key — "NI primary threshold", "ECB deposit rate", "passport renewal fee" — each with label, unit, period and verification date, and the full record of the top match when it is unambiguous. The keys feed `get_fact`. Filter by `namespace` (`uk`, `us`, `de`, `eu`).

what

what_changed_since

What has changed in Data Butler's verified datasets since a date — pass your training-cutoff date to learn which UK tax/NI/benefit thresholds, exam-spec facts, official vehicle datasets (UK DVSA, French RappelConso and Japanese MLIT recalls), software end-of-life dates (Node.js, Python, Ubuntu, Debian, Android, iOS, macOS, Windows, Java, Go, Ruby, PHP, PostgreSQL, React — cycles that reached end of life or whose dates moved), central-bank policy rates (Bank of England, Fed, ECB), US federal tax thresholds (IRS inflation adjustments, Social Security wage base, retirement and HSA limits), German tax and social-insurance thresholds (Grundfreibetrag, Beitragsbemessungsgrenzen, Zusatzbeitrag, Mindestlohn, Kindergeld), UK vehicle tax (VED) rates and MOT rules, UK exam dates (results days, summer timetable paper dates, entry deadlines and late-fee dates, announced specification changes), calendar facts (public holidays for the UK, US, Germany and France; tax-year and daylight-saving rules for nine countries — new years published, holidays added or moved) and UK government service fees and rules (passports, ETA, Universal Credit, eVisa) changed after your knowledge ends. Each entry: from → to, effectiveFrom, official source, verifiedDate, and a maintainer note (e.g. which Budget). Areas: uk-rates, uk-exams, vehicles, software-eol, policy-rates, us-rates, de-rates, uk-vehicle-rules, uk-exam-dates, calendar, uk-gov-process, or all. Coverage starts 2026-08-31. The same changelog is published for humans at https://databutler.dev/changes, with feeds at https://databutler.dev/changes.rss and https://databutler.dev/changes.atom. Output is a Verified Changes protocol document (verified-changes/0.1, spec https://databutler.dev/protocol); an entry whose figure is a Verified Fact carries factKey for get_fact.

Endpoints

URL	Transport	State	Latency	Checked
https://databutler.dev/api/mcp/facts	streamable-http	answering	162 ms	6 min ago

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Databutler Facts — questions

Answers built from our own checks of this server.

What can Databutler Facts do?

It exposes 3 tools, read directly from the server on our last check. Among them: get_fact, resolve_fact, what_changed_since. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Databutler Facts working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 72 of 92 checks got a reply (78.3%), average response time 257 ms. The bar chart above shows every period we have measured.

How do I connect Databutler Facts?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Databutler Facts need an API key?

No. Databutler Facts completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 3 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Databutler Facts?

It answers our handshake in 257 ms on average, which is faster than 50% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is Databutler Facts open source?

We cannot say either way: written in JavaScript, 0 stars on GitHub and 11 open issues, but we could not determine the licence, and without one the code is not open source by default.