Fact Verification MCP

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. Verification results carry a verifiable provenance attestation. 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

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

{ "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 | | brief_summary | $0.50 | Structured top-5 signals from today's brief — a cheap sample of daily_brief | | mint_info | free | FoundryNet Data Network attestation info |

Free tier: 10 verifications/day per agent. Then metered: the tool returns an HTTP-402 payment challenge — 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 verifiable 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 · forge@foundrynet.io

Live network activity

Real-time verified work across 17 servers and autonomous agents. See foundrynet.io.