Verified Facts
Claude connectorCommunityOfficial tax thresholds, rates and fees by key, with the official source, the date a human verified it, a freshness flag and a signature.
Verified Facts returns one official figure per lookup: you send a key such as uk/income-tax/personal-allowance and an optional max_age, and get back the value, unit and period, the official source URL (gov.uk, IRS, Bundesfinanzministerium, central banks), the date a person last checked it against that source, a fresh or stale flag, and an Ed25519 signature that can be checked against databutler.dev/.well-known/jwks.json.
It covers 496 figures: UK income tax, National Insurance, benefits, vehicle tax and MOT rules and government service fees; US federal tax brackets, Social Security, Medicare and retirement limits; German income tax and social-insurance thresholds; Bank of England, Fed and ECB policy rates; UK exam dates.
Three read-only tools: get_fact (one or several keys), resolve_fact (turns a plain-language question such as "NI primary threshold" into a key), and what_changed_since (every figure that changed after a given date, with before and after values and sources).
No account or API key. The same facts are served as plain web pages at databutler.dev/f/<key> and are described by an open specification, Verified Facts v0.2, at databutler.dev/facts.
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Data analytics2,519th of 2,740 by popularity · not ranked by trending score
| # | Connector | Popularity | Trending | 7d |
|---|---|---|---|---|
| 2517 | 2,000 | — | 869places down | |
| 2518 | 2,000 | — | 252places down | |
| 2519 | 2,000 | — | 252places down | |
| 2520 | 2,000 | — | 607places down | |
| 2521 |  Verus by Markst | 2,000 | — | 607places down |
This connector isn’t ranked by trending score, so the category’s top connectors are shown instead.
| # | Connector | Trending | Popularity | 7d |
|---|---|---|---|---|
| 1 | 29,445,468 | 12,305 #156 | — | |
| 2 |  Netzero | 1,983,480 | 8,531 #622 | 3places up |
| 3 | 507,188 | 7,845 #770 | — | |
| 4 |  Statz | 483,976 | 7,129 #943 | 71places up |
| 5 | 483,162 | 7,827 #778 | 563places up |
Financial services896th of 990 by popularity · not ranked by trending score
| # | Connector | Popularity | Trending | 7d |
|---|---|---|---|---|
| 894 | 2,000 | — | 607places down | |
| 895 | 2,000 | — | 252places down | |
| 896 | 2,000 | — | 252places down | |
| 897 | Verus by Markst | 2,000 | — | 607places down |
| 898 | 2,000 | — | — |
This connector isn’t ranked by trending score, so the category’s top connectors are shown instead.
| # | Connector | Trending | Popularity | 7d |
|---|---|---|---|---|
| 1 |  Intuit Developer | 1,059,790 | 12,502 #103 | — |
| 2 | 507,188 | 7,845 #315 | — | |
| 3 |  Etherscan | 450,704 | 13,335 #77 | 10places down |
| 4 |  etoro | 391,889 | 11,322 #155 | 1,028places up |
| 5 | 337,161 | 11,549 #143 | — |
More from Data Butler
All listings by Data ButlerTools
- get_fact
- resolve_fact
- what_changed_since
- Categories
- Made by
- Data Butler · Website
- Sign-in
- Not required
- Connector URL
- https://databutler.dev/api/mcp/facts
- Transport
- Streamable HTTP
- Works with
- Claude, Claude API, Claude Code, Claude Desktop
- Added
- October 13, 2026
- More info
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