Databutler Facts MCP server
online · 100% uptimeOfficial thresholds, rates and fees by key, with source, verified date and signature.
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Databutler Facts tools (3)
write = sends, deletes, buys or postsget_factFreeThe 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_factFreeRanked 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_changed_sinceFreeWhat 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.
Public scan report
scanner v0.1.10 · 2026-10-13 · same rubric, same numbers if you re-run it
- –Code scanremote-only server, no package to scann/a
- Live reliabilityremote reachable in 397ms20/20
- Tool poisoning3 tool descriptions checked15/15
- Auth qualityopen endpoint, read-only tools10/15
- Maintenancelast push 0 days ago15/15
- Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
How Databutler Facts compares
Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.
- Safety score
- 91/100
- higher than 85% of 48,255 servers
- Tools
- 3
- the typical server has 7
- Tools that change things
- 0%
- typical: 0%. Fewer write tools means less an agent can break
- Uptime
- 100%
- of our recent checks; the typical remote server answers 100%
- Response time
- 178 ms
- faster than 68% of 30,031 servers
What its tools let an agent do: 3 read
Install Databutler Facts in Claude Code, Cursor or VS Code
claude mcp add --transport http databutler-facts https://databutler.dev/api/mcp/facts
What the publisher says
From the Databutler Facts repository's README, as published. We do not edit it. Read it on GitHub
Data Butler (databutler.dev)
An agent honeypot: clean, verified UK public data served to AI agents via MCP and REST. Not an SEO play — no GSC ambitions. The customer is an AI assistant answering a human's question; the product is being the source that is right, with provenance on every number.
Vercel default databutler.vercel.app works, but registry listings must NOT be published until the final domain is live — listings bake in URLs).
- Planned domain: databutler.dev (until purchased/connected, the
MCP serving, domain attached, listed on Smithery (drchriseames/databutler-uk-exams, -uk-rates) and the official MCP Registry (io.github.physics-star-cat/databutler-uk-exams, -uk-rates). Tracking LIVE (GA4 property 552213153, verified in realtime; monitored by webmon 🤖 column). PulseMCP will auto-ingest from the official registry. Front door POST /api/mcp — built 2026-09-01 on branch feat/front-door; listing as io.github.physics-star-cat/databutler / Smithery drchriseames/databutler pending deploy.
- Status: LIVE (launched 2026-08-31): https://databutler.dev — REST +
lowriskquotes.com (Monte Carlo) — full history in ../docs/AUDIT2026-08-30five-sites.md §3b–3e and ../docs/MONETISATION-DECISION.md.
- Born 2026-08-31 out of the agent-API work on whatbreaks.uk (MOT data) and
The model (one brand, many focused servers)
There is no domain authority in MCP registries — discovery is per-listing. So this is NOT one mega-server (tool-list bloat kills those); it is one domain/repo/brand hosting separate, focused MCP endpoints, each listed individually under one namespace, cross-referencing each other:
Front door (2026-09): POST /api/mcp lists the five high-frequency tools directly plus whatchangedsince, coverage, catalogue, call. It is still not a mega-server — everything else stays behind call, capped at 9 listed tools by test. The focused servers remain live and listed.
The roadmap is ordered by (value to an AI agent) × (likelihood we can build it well). It deliberately includes the maintainer-Claude wishlist — this product is designed with Claude as the end user, by Claude:
Shortened. The full README is on GitHub.
Nothing above is checked by us. What we check is on the safety report.
Databutler Facts: common questions
- Is Databutler Facts MCP server safe?
- Yes, by our scan: it is graded A (91/100). Read the Databutler Facts safety report
- How do I install Databutler Facts?
- It runs remotely at databutler.dev. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
- Does Databutler Facts need an API key?
- Not as far as the registry entry and our scan can tell: no credentials are declared or required.
- Is Databutler Facts maintained?
- The last commit was 22 days ago (2026-10-13). The latest release is v1.0.0.
- Is Databutler Facts up?
- 100% of our last 28 checks got an answer. We check remote servers about four times a day.
- How does Databutler Facts compare with other MCP servers?
- safety score 91/100 (higher than 85% of 48,255 servers); tools 3 (the typical server has 7); tools that change things 0% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.