Fact Checker — Verify Claims with Web Evidence
AI-powered fact-checking API for AI agents. Verify any factual claim with web evidence: searches multiple sources, assesses credibility, provides supporting/contradicting URLs, and returns confidence level (confirmed/likely/unverified/false). Tools: research_check_fact. Use this before repeating claims, for content moderation, or building trustworthy AI systems. Essential for reducing hallucinations. IMPORTANT: For web search without fact assessment, use web_search_query. Returns: {verdict, confidence, sources[], evidence[]}. No API key required — x402 micropayment $0.005/call on Base L2.
How to connect
https://fact-checker--axel-belfort.run.tools
tools/list returns the expected tools before relying on them in production.Listing quality
Observable facts from our catalog and daily probe — not a safe-to-install badge.
- Surface
- Tools indexed
- Live handshake
- Auth required
- Auth gate
- Auth gate
- Tools source
- tools/list (live)
Observable catalog + probe facts — not a safe-to-install badge.
Tools
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research_check_factUse this when you need to verify a factual claim, check if a statement is true, or find evidence supporting or contradicting a claim. Accepts a claim text and returns relevant web snippets, source URL
Tool source: tools/list (live) · last probed 2026-09-18