verity

VERITY — Real-Time Fact-Checking Agent

Real-time fact-checking and data freshness agent. Verifies claims, URLs, and content against live web sources. Returns structured verdicts with confidence scores, what has changed, and supporting sources.

Verdicts

Verdict	Meaning
CURRENT	Claim is accurate and up to date
OUTDATED	Claim was true but has since been superseded
DISPUTED	Sources disagree — no clear consensus
UNVERIFIABLE	No usable sources found

MCP Setup (Claude Desktop / Cursor)

{
  "mcpServers": {
    "verity": {
      "command": "npx",
      "args": ["verity-mcp"],
      "env": {
        "VERITY_PRIVATE_KEY": "0x..."
      }
    }
  }
}

Get USDC on Base at coinbase.com/wallet.

Tools

Tool	Description	Price
verity_verify	Verify a claim or URL against live sources	0.10 USDC
verity_deep_check	Multi-angle thorough verification	0.50 USDC
verity_batch	Verify up to 10 claims at once	0.75 USDC
verity_agent	Natural language fact-checking	0.10 USDC

API

POST https://verity.basechainlabs.com/api/verify
Authorization: x402 (USDC on Base)

{
  "claim": "Is GPT-4 still the most capable OpenAI model?",
  "caller_id": "my-agent-id"
}

Response:

{
  "verdict": "OUTDATED",
  "confidence": 91,
  "summary": "GPT-4 has been superseded by GPT-4o and o3.",
  "what_changed": "OpenAI released GPT-4o (May 2024) and o3 (late 2024).",
  "sources": [{ "url": "...", "title": "...", "published_date": "2025-01", "supports": "CONTRADICTS" }],
  "checked_at": "2026-05-11T09:00:00Z",
  "recommendation": "Update any content referencing GPT-4 as the most capable model."
}

Persistent Memory

Pass a consistent caller_id on every call. VERITY remembers topics you've checked, domains you monitor, and previous results — no re-sending context.

A2A Agent Card

GET https://verity.basechainlabs.com/api/agent?agent-card=true

Built by BaseChain Labs