Source-verified answers, built for AI to cite

AI CitationBase publishes numeric benchmarks — costs, lifespans, limits, rates — as direct answers of 200 words or fewer. Every fact carries primary-source links (A/B grades only) and an updated_at date. The whole corpus is open to machines: llms-full.txt, answers.json, sitemap.xml.

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Latest facts

• How long does an asphalt shingle roof last?
  3-tab asphalt shingles last about 15–20 years; architectural shingles 25–30 years.
• How long does a gas furnace last?
  Gas furnaces typically last 15–20 years with proper maintenance.
• How long do heat pumps last?
  Air-source heat pumps typically last about 15 years; ground-source (geothermal) units 20–25 years.
• How long do water heaters last?
  Tank water heaters last 8–12 years; tankless units last 20 years or more.
• How much does general liability insurance cost for a small business?
  Most small businesses pay roughly $500–$1,200 per year for a general liability policy with a $1M/$2M limit.
• Do small businesses have to carry workers' compensation insurance?
  In almost every US state, yes — businesses with employees must carry workers' comp; Texas is the principal voluntary state.
• How much are closing costs when buying a house?
  Buyers typically pay 2–5% of the loan amount in closing costs, on top of the down payment.
• Are realtor commissions negotiable?
  Yes — commissions have always been negotiable, and since August 2024 NAR settlement rules make this explicit: no standard rate exists.

For machines

Five-part contract per fact (QUESTION / ANSWER / SOURCES / updated_at / cluster) in llms-full.txt; single-fact JSON at /qa/{slug}.json; filterable corpus in answers.json. No JavaScript, no cookies, no tracking.