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.
- Tools
- 3
exposed by this connector
Movement
From our daily snapshots over the last 30 days.
Rank by popularity
Rank by trending score
Popularity score
Trending score
Movement is measured against our own daily snapshots, and there isn’t an earlier one to compare with yet.
In its categories
How this connector compares with others in the same category. Positions are counted within the category, not across the whole directory.
Data analyticsnot ranked by popularity · not ranked by trending score
This connector isn’t ranked by popularity, so the category’s top connectors are shown instead.
| # | Connector | Popularity | Trending | 7d |
|---|---|---|---|---|
| 1 | 19,155 | 49,258 #160 | 0 | |
| 2 |  Salesforce - Beta | 19,130 | 47,175 #174 | 0 |
| 3 | 18,695 | 48,424 #169 | 0 | |
| 4 | 18,332 | 51,499 #147 | 1places down | |
| 5 |  vidIQ | 18,300 | 59,364 #113 | 4places up |
This connector isn’t ranked by trending score, so the category’s top connectors are shown instead.
| # | Connector | Trending | Popularity | 7d |
|---|---|---|---|---|
| 1 |  Etherscan | 12,303,258 | 10,597 #248 | — |
| 2 |  TEXT TO QUANT | 11,637,883 | 11,562 #171 | 742places up |
| 3 | 10,349,589 | 10,662 #243 | 12places up | |
| 4 |  Keel | 2,903,912 | 9,066 #422 | 7places up |
| 5 | 2,019,821 | 11,061 #204 | 11places up |
Financial servicesnot ranked by popularity · not ranked by trending score
This connector isn’t ranked by popularity, so the category’s top connectors are shown instead.
| # | Connector | Popularity | Trending | 7d |
|---|---|---|---|---|
| 1 | 18,580 | 51,257 #63 | 2places up | |
| 2 |  Intuit QuickBooks | 18,088 | 45,066 #89 | 0 |
| 3 | 17,924 | 42,546 #99 | 0 | |
| 4 | 17,841 | 43,727 #97 | 4places down | |
| 5 | 17,738 | 51,412 #62 | 2places down |
This connector isn’t ranked by trending score, so the category’s top connectors are shown instead.
| # | Connector | Trending | Popularity | 7d |
|---|---|---|---|---|
| 1 | Etherscan | 12,303,258 | 10,597 #154 | — |
| 2 | TEXT TO QUANT | 11,637,883 | 11,562 #119 | 742places up |
| 3 | 10,349,589 | 10,662 #151 | 12places up | |
| 4 | Keel | 2,903,912 | 9,066 #206 | 7places up |
| 5 |  Octopus AI | 2,221,248 | 8,735 #223 | — |
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.
Tools
- 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