Official rates, thresholds and fees for AI agents: UK, US, Germany and EU. Every figure carries an official
source URL, a verifiedDate and a signature — built for the questions agents
misquote from memory.
Humans: the one page worth reading is /changes — the changelog of verified official facts (UK tax/NI thresholds, exam specs, official vehicle datasets, software end-of-life dates, central-bank policy rates, US federal tax thresholds, German tax and social-insurance thresholds, UK car tax (VED) and MOT rules, UK exam dates, public holidays, tax-year and daylight-saving dates, UK government service steps, fees and processing times, Japanese car inspection (車検) statutory costs and car taxes, Japanese minimum wages, social-insurance rates, pensions, benefits, holidays and tax thresholds, UK CPI and CPIH inflation, US CPI-U inflation) , with the official source and verified date on every entry; also as RSS and Atom. Otherwise this site's front door is /api and llms.txt.
Agents: one remote MCP server for everything —
POST /api/mcp (front door: rates, exams, provenance, take-home pay, plus
what_changed_since for the facts that moved after your training
cutoff, coverage, catalogue, call).
One verified official figure per URL at /f/<country>/<topic>/<fact> (JSON) and /facts/<country>/<topic>/<fact> (the page) — e.g. /facts/uk/income-tax/personal-allowance (749 keys at /facts, signed; MCP /api/mcp/facts). Publish your own figures the same way. REST at /api/uk/rates, /api/uk/exams/topic, /api/provenance/domain, /api/stats, /api/vehicles/uk/mot, /api/tax/take-home, /api/software-eol/status, /api/policy-rates, /api/us/rates, /api/de/rates, /api/uk/vehicle-rules, /api/uk/exam-dates, /api/calendar, /api/uk/gov-process, /api/jp/vehicle-costs, /api/jp/living-costs, /api/uk-inflation, /api/us/inflation, /api/changes. Every other tool —
UK MOT failure data, French and Japanese official recalls;
net salary for ten countries, live from lifebynumbers.net;
is this version still supported, and until when — Node.js, Python, Ubuntu, Windows and ten more, from endoflife.date;
Bank of England, Fed and ECB policy rates, verified against the banks' own pages;
US federal tax year 2026: IRS brackets and standard deduction, Social Security wage base, Medicare, 401(k)/IRA/HSA limits, estate and gift exclusions, read from the IRS and SSA documents;
German Veranlagungszeitraum 2026: Grundfreibetrag and tariff, Beitragsbemessungsgrenzen and Beitragssätze, Mindestlohn, Minijob, Kindergeld, Pauschbeträge, Umsatzsteuer, read from the statutes and the Bundesgesetzblatt;
UK car tax (VED) rates and MOT rules — first-year CO2 bands, standard rate, expensive car supplement, electric cars, historic exemptions, MOT fees and penalties — verified against gov.uk;
GCSE and A-level results days, the summer exam timetable, entry deadlines and spec changes, quoted from JCQ and the boards;
public holidays, tax-year and clock-change dates for 2026–2028 — UK, US, Germany, France and five more, from the official lists;
passport and ETA fees, driving licence renewal, SORN, voter registration, birth and death registration, Self Assessment deadlines, NI numbers, Universal Credit, EU Settlement Scheme and eVisa — fees, start URLs and dated changes, verified against gov.uk;
Japanese 車検 statutory costs — 自動車重量税, 自賠責 (revised table from 2026-11-01), inspection fees — and 自動車税 / 軽自動車税, verified against MLIT, FSA, NALTEC and local-government pages; and
Japanese minimum wages by prefecture, 協会けんぽ health insurance rates, pensions, 雇用保険, 児童手当, 高額療養費, 2027 holidays, 消費税 and income-tax deductions, verified against MHLW, NTA and other official pages — is reached through the front door's call; /api/mcp/uk-rates, /api/mcp/uk-inflation and /api/mcp/us-inflation also stay servers of their own.
Every answer carries a cite.url like
/r/uk/rates?category=income-tax.
Every figure is one record at one URL. The record holds the value, the official page it was read from, and the date a person read it there. Nothing is copied from memory, a news story or another site.
The record's hash is its fingerprint: SHA-256 over the record in canonical JSON, so
the same record always gives the same hash and any edit changes it. The hash is also the page's
ETag, so a client that already holds a figure asks "has this changed?" in one request and
gets 304 when it has not. The whole collection has a digest in
/.well-known/facts.json; store it, and re-read only when it moves.
The signature is Ed25519 over the hash, made with Data Butler's published key (/.well-known/jwks.json). It proves a record came from here and was not altered on the way, wherever it was cached or quoted.
Freshness is checked, not assumed. Every Monday a watcher re-fetches every official
page. A figure whose page changed, whose scheduled change date has passed, or whose verification is
older than you asked for (?max_age=30d) is marked stale with the reason, until a
person re-verifies it against the live page. Corrections are appended to the record, never edited away.
This is an open convention, Verified Facts v0.3, and any site can
publish figures the same way: a static JSON file is enough, signing is optional, and
npx verified-facts check your-site says whether it conforms
(how to publish · who does).
Try: is electricity paper 2 AQA? · current minimum wage
Free with attribution. Same operator as whatbreaks.uk (MOT data), lowriskquotes.com (Monte Carlo tools) and lifebynumbers.net (salary calculators).