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 do AI answer engines choose which sources to cite?
  No engine publishes exact rules; research and observed behavior point to retrievability, direct quotability, attribution, freshness, and authority as the main factors.
• What is AI citation monitoring?
  AI citation monitoring tracks whether and how AI answer engines cite a site — or a brand — for a defined set of prompts, measured on a regular cadence.
• What is generative engine optimization (GEO)?
  GEO is the practice of making content more likely to be retrieved, quoted, and cited by AI answer engines, formalized in a KDD 2024 research paper.
• What is llms.txt?
  llms.txt is a proposed standard: a markdown file at /llms.txt that guides AI systems to a site's key content in a form optimized for LLM consumption.
• How long does an asphalt shingle roof last?
  3-tab asphalt shingles are listed at about 20 years and architectural shingles at about 30 years (InterNACHI); ventilation and installation quality swing the outcome.
• How long does a gas furnace last?
  A gas furnace typically lasts 15 to 25 years; replacement usually pays off before then as efficiency gains compound.
• How long do heat pumps last?
  Air-source heat pumps last about 10 to 15 years; geothermal indoor components are estimated up to 24 years and ground loops 50+ years (DOE).
• How long do water heaters last?
  Conventional tank water heaters last 6 to 12 years; tankless units are listed around 10 years — tank type, water quality, and maintenance decide where you land.

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; keyword search at /api/v1/search. No JavaScript, no cookies, no tracking.

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