Official thresholds, rates and fees by key, with source, verified date and signature.
| Endpoint | https://databutler.dev/api/mcp/facts (streamable-http) |
|---|---|
| Registry version | 1.0.0 |
| Now | 3 tools · grade D (55) · pin ts_d825f9c279a313f2875a9ebd7766e403 · protocol 2025-06-18 |
| First / last listed | 2026-11-07 01:44 UTC / 2026-11-07 01:44 UTC |
| Grade over time | 2026-11-07: D (55), 3 tools |
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Tools: get_fact resolve_fact what_changed_since
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/grundfreibet params: key*, max_age, as_of, period |
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`). params: q*, namespace, limit |
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 o params: since*, area |
Entries describe changes in tool definitions. They are not statements about a server, its quality or its author. The grade measures how the tool definitions fit model providers (token cost, schema compatibility, confusable names) as scored by the ToolFit engine at the time of the listing. JSON: append .json. Opt-out: how or hello@youraitools.co.