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.
Verdict | Meaning |
| Claim is accurate and up to date |
| Claim was true but has since been superseded |
| Sources disagree — no clear consensus |
| No usable sources found |
Related MCP server: Groundcheck
{
"mcpServers": {
"verity": {
"command": "npx",
"args": ["verity-mcp"],
"env": {
"VERITY_PRIVATE_KEY": "0x..."
}
}
}
}Get USDC on Base at coinbase.com/wallet.
Tool | Description | Price |
| Verify a claim or URL against live sources | 0.10 USDC |
| Multi-angle thorough verification | 0.50 USDC |
| Verify up to 10 claims at once | 0.75 USDC |
| Natural language fact-checking | 0.10 USDC |
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"verdict": "OUTDATED",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"summary": "GPT-4 has been superseded by GPT-4o and o3.",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."
}Pass a consistent caller_id on every call. VERITY remembers topics you've checked, domains you monitor, and previous results — no re-sending context.
GET https://verity.basechainlabs.com/api/agent?agent-card=trueBuilt by BaseChain Labs
This server cannot be deployed
Real-time fact-check, citation verification, and source-freshness for AI agents.
Compact, citation-verifiable public web context for AI agents, paid per use with x402.
Evidence-backed x402 web verification for AI agents, with auditable decisions for every condition.
Web intelligence for AI agents: fetch, render, extract, research. x402 micropayments, no API keys.
