A free knowledge-graph-style search API
Need to ground an agent in real entities and sites rather than a static graph? FreeSerp is a free, keyless knowledge-graph-style search API — it resolves a name or topic to real, live domains with structured metadata, and can pull the supporting pages from a 3.1B+ page web index.
curl 'https://freeserp.ai/api.php?q=openai&size=5'Each site profile carries a factual LLM summary, category, AI sub-niche, Domain Rating and live date — the structured fields a knowledge layer needs, returned as clean JSON. Filter and sort on any of them to build entity lists, disambiguate names, or feed a RAG pipeline. Then switch to index=web to fetch the actual pages that mention the entity, each with a citation back to the crawl record.
Two indexes, one endpoint. index=web searches FreeSerp Global, our own 3.1B+ page web index — any URL, any language, ranked by text relevance, link authority and domain trust, with a site card (Domain Rating, category, live date) on every hit. The default FreeSerp Main index (main pages only) holds 20M+ live sites at homepage level with LLM summaries, Domain Rating and AI-niche taxonomy, filterable and sortable on every field.
FreeSerp vs Paid alternatives
| FreeSerp | Paid alternatives | |
|---|---|---|
| Entity lookup | Domain → summary, DR, niche, live date | Static graph nodes |
| Supporting pages | index=web, 3.1B+ pages with citations | — |
| Price / key | Free, none | Varies |
FAQ
Is there a free knowledge graph search API?
FreeSerp offers free, keyless entity-style search over 20M+ site profiles with structured JSON fields, plus full-web search over 3.1B+ pages.
Can I use it for RAG?
Yes — site results include a ready-to-read summary, and web results include snippets and a crawl citation, so you can ground a model without scraping HTML.
