{
  "protocol": "verified-facts/0.3",
  "publisher": {
    "name": "Data Butler",
    "url": "https://databutler.dev/"
  },
  "conformance": "L3",
  "updated": "2026-11-02",
  "facts": {
    "count": 749,
    "get": "https://databutler.dev/f/{key}",
    "page": "https://databutler.dev/facts/{key}",
    "batch": "https://databutler.dev/f?keys={keys}",
    "resolve": "https://databutler.dev/f/resolve?q={q}",
    "index": "https://databutler.dev/f",
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      "us/social-security/wage-base",
      "de/income-tax/grundfreibetrag",
      "uk/bank-rate"
    ]
  },
  "namespaces": [
    {
      "name": "uk",
      "description": "UK tax/NI thresholds, Bank of England Bank Rate, UK car tax (VED) and MOT rules, UK exam dates, UK government service steps, fees and processing times and UK CPI and CPIH inflation",
      "count": 412,
      "cadence": "uk-rates: Every 6 April (new tax year) and after each Budget or Autumn Statement; minimum wage on 1 April; every source page re-fetched weekly. policy-rates: After each scheduled decision (eight a year per bank); re-verified within 45 days of verifiedDate; every source page re-fetched weekly. uk-vehicle-rules: Every 1 April (VED rates and the historic-vehicle exemption date move with the Finance Act) and after each Budget; MOT fees and rules when DVSA changes them; every source page re-fetched weekly. uk-exam-dates: Annual, calendar-driven: when JCQ and the boards publish the following summer's final timetables (early in the calendar year) and the results days; the weekly watcher hashes the JCQ and board timetable pages uk-gov-process: Re-verified against the gov.uk pages every 30 days and on fee-change days (Home Office fees usually move in April); every source page re-fetched weekly through the gov.uk content API. uk-inflation: Monthly, on the ONS CPI release day (stated as nextRelease in the series); every source page re-fetched weekly",
      "authorities": [
        "qualifications.pearson.com",
        "qualifications.wales",
        "webarchive.nationalarchives.gov.uk",
        "www.aqa.org.uk",
        "www.bankofengland.co.uk",
        "www.gov.uk",
        "www.jcq.org.uk",
        "www.ocr.org.uk",
        "www.ons.gov.uk",
        "www.sqa.org.uk",
        "www.wjec.co.uk"
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      "name": "us",
      "description": "Federal Reserve federal funds target range, US federal tax thresholds and US CPI-U inflation",
      "count": 101,
      "cadence": "policy-rates: After each scheduled decision (eight a year per bank); re-verified within 45 days of verifiedDate; every source page re-fetched weekly. us-rates: Annual: after the IRS tax-year inflation adjustments (October), the retirement-plan limits (November), the SSA Federal Register notice (October/November) and the CMS Medicare amounts (November); source pages re-fetched weekly, ssa.gov read by hand. us-inflation: Monthly, on the BLS CPI release day; every source page re-fetched weekly",
      "authorities": [
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        "www.bls.gov",
        "www.cms.gov",
        "www.ecfr.gov",
        "www.federalregister.gov",
        "www.federalreserve.gov",
        "www.irs.gov",
        "www.medicare.gov",
        "www.ssa.gov"
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      "digest": "sha256:ee53a630af00643d5491639abb5e0dcab96e72c0da7ef9678a33b3cbb15762bb"
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      "name": "de",
      "description": "German tax and social-insurance thresholds",
      "count": 46,
      "cadence": "de-rates: Annual: after the Sozialversicherungsrechengrößen-Verordnung and the Zusatzbeitrag announcement (November), and any Steuergesetz changing § 32a EStG for the next Veranlagungszeitraum; the Umsatzsteuer rates only when a Gesetz amends § 12 UStG (irregular); every source page re-fetched weekly.",
      "authorities": [
        "www.bmas.de",
        "www.bundesanzeiger.de",
        "www.bundesgesundheitsministerium.de",
        "www.deutsche-rentenversicherung.de",
        "www.gesetze-im-internet.de",
        "www.minijob-zentrale.de",
        "www.recht.bund.de"
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      "digest": "sha256:d912262545e51f6c0bf93a58a99889fe6329cdab8b164f51cc8a7b088261763a"
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      "name": "eu",
      "description": "ECB key interest rates",
      "count": 3,
      "cadence": "policy-rates: After each scheduled decision (eight a year per bank); re-verified within 45 days of verifiedDate; every source page re-fetched weekly.",
      "authorities": [
        "www.ecb.europa.eu"
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      "digest": "sha256:5bf28d34337e35312092d272b7958198d753bb22400e10f9e745333766bd67bf"
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    {
      "name": "jp",
      "description": "Japanese car inspection (車検) statutory costs and car taxes and Japanese minimum wages, social-insurance rates, pensions, benefits, holidays and tax thresholds",
      "count": 187,
      "cadence": "jp-vehicle-costs: Re-verified against the official pages every 35 days and on the known change dates (自賠責 revisions, last 2026-11-01; car taxes each 1 April; weight-tax eco bands 2027-05-01); every source page re-fetched weekly. jp-living-costs: Re-verified against the official pages every 35 days and on the known change dates (prefecture minimum wages 2026-10-01 to 2026-12-02 and each autumn, deductions 2026-12-01, insurance and pension rates each March/April, 高額療養費 2027-08-01, the 2028 holidays in February 2027); every source page re-fetched weekly.",
      "authorities": [
        "www.cfa.go.jp",
        "www.city.koto.lg.jp",
        "www.fsa.go.jp",
        "www.giroj.or.jp",
        "www.kyoukaikenpo.or.jp",
        "www.mhlw.go.jp",
        "www.mlit.go.jp",
        "www.naltec.go.jp",
        "www.nenkin.go.jp",
        "www.nta.go.jp",
        "www.soumu.go.jp",
        "www.tax.metro.tokyo.lg.jp",
        "www8.cao.go.jp"
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      "digest": "sha256:9f3a6e8902c4261a40e9fbe6f5223bc7ab2aac0e3336a58f220f274c306a3957"
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  "changes": "https://databutler.dev/.well-known/changes.json",
  "openapi": "https://databutler.dev/openapi.json",
  "mcp": {
    "url": "https://databutler.dev/api/mcp/facts",
    "tools": [
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      "resolve_fact",
      "what_changed_since"
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    "serverCard": "https://databutler.dev/api/mcp/facts/server-card"
  },
  "schema": "https://databutler.dev/schema/fact.v0.json",
  "specification": "https://databutler.dev/protocol/facts",
  "licence": "Free to reuse with attribution to databutler.dev; each figure belongs to its official source and stays under that source's terms (gov.uk: Open Government Licence v3.0).",
  "contact": "https://github.com/physics-star-cat/databutler/issues"
}