Databutler Facts
Official thresholds, rates and fees by key, with source, verified date and signature.
Connect it
Settings → Connectors → Add custom connector
URL: https://databutler.dev/api/mcp/factsSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://databutler.dev/api/mcp/facts{
"mcpServers": {
"databutler-facts": {
"url": "https://databutler.dev/api/mcp/facts"
}
}
}claude mcp add --transport http databutler-facts https://databutler.dev/api/mcp/facts{
"servers": {
"databutler-facts": {
"type": "http",
"url": "https://databutler.dev/api/mcp/facts"
}
}
}3 tools, verified live
get_factread-onlyThe 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/grundfreibet
resolve_factread-onlyRanked 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_sinceread-onlyWhat 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 o
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