# Data Butler Facts Muse connector

From musedirectory.ai, the independent directory of Meta Muse connectors. Not affiliated with Meta.

## Data Butler Facts

Look up official tax thresholds, rates, fees and policy deadlines with verified sources and dates.

- Record: https://musedirectory.ai/connector/data-butler-facts
- Category: Finance & Bills
- Developer: physics-star-cat (https://databutler.dev/api)
- Muse status: Extra setup. Not in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
- Health: Working, 131ms, checked 2026-10-29T12:31:04Z
- Endpoint: https://databutler.dev/api/mcp/facts
- Auth: No account needed; Pricing: unknown
- Screening: Screened, no issues found (2026-10-29T05:16:15Z)
- Source: Found in the official MCP Registry (io.github.physics-star-cat/databutler-facts) https://registry.modelcontextprotocol.io/v0/servers?search=io.github.physics-star-cat%2Fdatabutler-facts

Provides current official figures for tax thresholds, rates, allowances, fees and policy rates across UK, US, Germany and EU, with verification dates and source URLs. Helps verify what applies today or on a specific date.

Example request: "What is the current UK personal income tax allowance?"

How to connect: Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use Data Butler Facts to help me. It is a free service with an MCP server at https://databutler.dev/api/mcp/facts. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.

Tools:
- 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/per
- 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_fa
- 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, 

Screening checks:
- MCP handshake: pass (Answered in 373ms)
- Domain against threat feeds (Cloudflare security DNS): pass (databutler.dev not flagged)
- Published packages against the OSV malicious-package database: n/a (No npm or PyPI package published)
- Hidden instructions or invisible characters in tool text: pass (3 tools read, nothing found)
- Inputs asking for passwords, card numbers or seed phrases: pass (None found)
- Domain and redirects: pass (No redirects off the domain)
- AI review of purpose and tool behavior: pass (No concerns)