This tool is no longer present in the server's latest manifest. Showing the last observed version (server version 1.28.0).
onyx_fact_check
InactiveTool of onyx-paid-mcp
declared in 1.28.0
Fact-check any claim by fetching real-time web evidence. Returns supporting sources, contradicting sources, a 0-100 confidence score, and a short summary. Use for prediction-market resolvers, news-fact agents, journalist-bot pipelines, or any agent that needs to verify a statement before acting on it. Sub-second latency, no API key on the caller side. Coinbase PROJECT-IDEAS.md explicitly calls for this primitive. (price: $0.05 USDC, tier: premium)
Parameters schema
{
"type": "object",
"required": [
"claim"
],
"properties": {
"claim": {
"type": "string",
"description": "The factual statement to verify. E.g. 'The 2026 G20 summit will be hosted in Cape Town' or 'USDC supply on Base mainnet exceeds $5B'."
},
"max_sources": {
"type": "integer",
"default": 8,
"description": "Maximum number of sources to return (1-15, default 8)"
}
}
}Parent server
onyx-paid-mcp
https://github.com/dimitrilaouanis-tech/onyx-mcp
2/7 registries