io.github.FoundryNet/fact-check-mcp

Official

by FoundryNet · Python

Fact Verification MCP

Verify claims with verdict, confidence & cited sources; batch verify, source checks, daily brief.

Verify claims with verdicts, confidence scores, and cited sources including batch verification.

Topics

agent-toolsai-agentscontent-verificationdata-intelligencefact-verificationfoundrynetmachine-context-protocolmcpmcp-serversource-verificationtruth-checkingclaim-checking

README.md3 KBView on GitHub

Fact Verification MCP

Fact verification for AI agents — give it a claim, get a verdict (supported / disputed / unverifiable) with a 0-100 confidence and cited sources. It classifies each claim's domain and cross-references the FoundryNet Data Network plus a general web search.

Part of the FoundryNet Data Network. Attest your agent's verification results with MINT Protocol. See also: financial-signals-mcp, cyber-intel-mcp, patent-intel-mcp, gov-contracts-mcp, compliance-mcp, brand-intel-mcp, weather-intel-mcp, academic-intel-mcp, oss-intel-mcp, social-intel-mcp.

Connect

MCP endpoint (Streamable HTTP): https://fact-check-mcp-production.up.railway.app/mcp
Registry: io.github.FoundryNet/fact-check-mcp
Agent card: https://fact-check-mcp-production.up.railway.app/.well-known/agent-card.json

Claude Desktop / Cursor / Claude Code

bash

claude mcp add --transport http fact-check https://fact-check-mcp-production.up.railway.app/mcp

json

{ "mcpServers": { "fact-check": { "url": "https://fact-check-mcp-production.up.railway.app/mcp" } } }

Tools

Tool	Price	What it does
`verify_claim`	$0.02	Verify a claim → verdict, confidence, cited sources, explanation
`batch_verify`	$0.01/claim (min $0.05)	Verify many claims in one call
`source_check`	$0.01	Assess a source URL — domain age (RDAP), trust signals, bias indicators
`daily_brief`	$5	Curated daily brief — top disputed/most-verified claims, trending topics
`mint_info`	free	FoundryNet Data Network + MINT Protocol

Free tier: 10 verifications/day per agent. Then x402: the tool returns an HTTP-402 with a Solana USDC payment memo — pay it, re-call with the same args plus payment_tx=<signature>. An Authorization: Bearer fnet_… key bypasses the paywall.

How it works

Each claim is classified by domain and cross-referenced against the most relevant FoundryNet data source and a general web search:

company claims → brand-intel-mcp
finance claims → financial-signals-mcp
patents claims → patent-intel-mcp
regulation claims → compliance-mcp

The verdict is synthesized from source agreement and returned with the citations that drove it. Results are cached for 24h (keyed by a normalized-claim hash) and carry a MINT provenance attestation so a buyer can verify the result was produced by this server, unaltered.

The general web-search backend needs a WEB_SEARCH_API_KEY (Brave Search API). Without it, claims with no FoundryNet corroboration return unverifiable with a note rather than a guess.

Sources

On demand: a general web search (Brave Search API) + the FoundryNet Data Network sibling servers (called over their public MCP endpoints). Source-credibility checks use keyless RDAP for domain age. Cached in a standalone Supabase project.

Discovery

MCP registry: io.github.FoundryNet/fact-check-mcp

Built by FoundryNet · hello@foundrynet.io

Live network activity

Live feed: mint.foundrynet.io/feed
Real-time verified work across 21 servers and autonomous agents, anchored on Solana via MINT Protocol.

Install

claude_desktop_config.json

{
  "mcpServers": {
    "fact-check-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "https://fact-check-mcp-production.up.railway.app/mcp"
      ]
    }
  }
}

Desktop config is stdio-only; this bridges via mcp-remote. Native remote: Settings > Connectors.