Claim Check by Agentropolis: send one factual claim and get supports / contradic...

{ "body": { "claim": "The Eiffel Tower is about 330 metres tall." }, "bodyType": "json", "method": "POST", "type": "http" }

{ "example": { "advisory": true, "attribution": "Wikipedia text © Wikipedia contributors, CC BY-SA 4.0. News discovery via the GDELT Project (https://www.gdeltproject.org/).", "caveats": [ "The claim uses 'about' which matches the approximate height given in sources.", "Sources focus on the original Eiffel Tower in Paris, not replicas or scaled versions." ], "check_version": "claim-check-0.1.1", "claim": "The Eiffel Tower is about 330 metres tall.", "confidence": 0.9, "cost": { "input_tokens": 2035, "model_usd": 0.00115, "output_tokens": 210 }, "evidence": [ { "quote": "The tower is 330 metres (1,083 ft) tall", "quote_verified": true, "source": "S1", "stance": "supports", "title": "Eiffel Tower", "url": "https://en.wikipedia.org/wiki/Eiffel_Tower" }, { "quote": "The tower is 330 metres (1,083 ft) tall.", "quote_verified": true, "source": "S2", "stance": "supports", "title": "Eiffel Tower replicas and derivatives", "url": "https://en.wikipedia.org/wiki/Eiffel_Tower_replicas_and_derivatives" } ], "latency_ms": 4012, "method": "A small model writes search queries; evidence comes from Wikipedia (CC BY-SA 4.0) and GDELT news (15-minute export files for recent hours, plus the DOC API when it answers); the best-matching passages go to a judge model that must quote sources verbatim. Quotes are machine-checked against the source text; a verdict with no verified quote is downgraded to unclear.", "normalized_claim": "The Eiffel Tower is about 330 metres tall.", "searched": { "news_query": null, "source_notes": [], "wikipedia_queries": [ "Eiffel Tower height", "Eiffel Tower dimensions" ] }, "sources": [ { "date": "2026-11-10T14:36:56Z", "domain": "en.wikipedia.org", "id": "S1", "source": "wikipedia", "title": "Eiffel Tower", "url": "https://en.wikipedia.org/wiki/Eiffel_Tower" }, { "date": "2026-11-08T07:05:28Z", "domain": "en.wikipedia.org", "id": "S2", "source": "wikipedia", "title": "Eiffel Tower replicas and derivatives", "url": "https://en.wikipedia.org/wiki/Eiffel_Tower_replicas_and_derivatives" }, { "date": "2026-11-08T02:12:26Z", "domain": "en.wikipedia.org", "id": "S3", "source": "wikipedia", "title": "Eiffel Tower (Paris, Texas)", "url": "https://en.wikipedia.org/wiki/Eiffel_Tower_(Paris,_Texas)" }, { "date": "2026-11-08T02:04:30Z", "domain": "en.wikipedia.org", "id": "S4", "source": "wikipedia", "title": "Eiffel Tower (Six Flags)", "url": "https://en.wikipedia.org/wiki/Eiffel_Tower_(Six_Flags)" }, { "date": "2026-11-10T14:37:27Z", "domain": "en.wikipedia.org", "id": "S5", "source": "wikipedia", "title": "Exposition Universelle (1889)", "url": "https://en.wikipedia.org/wiki/Exposition_Universelle_(1889)" }, { "date": "2026-11-08T02:26:13Z", "domain": "en.wikipedia.org", "id": "S6", "source": "wikipedia", "title": "Champs de Mars: The Red Tower", "url": "https://en.wikipedia.org/wiki/Champs_de_Mars:_The_Red_Tower" } ], "summary": "The sources clearly state that the Eiffel Tower is 330 metres tall, confirming the claim. Both [S1] and [S2] explicitly mention the height as 330 metres (1,083 ft), supporting the claim directly.", "tier": "standard", "verdict": "supports" }, "type": "json" }