Summary
Connects Claude to a live fact-checking API that returns structured verdicts (CURRENT, OUTDATED, DISPUTED, UNVERIFIABLE) with confidence scores and supporting sources. Exposes four tools: verity_verify for single claims, verity_deep_check for thorough multi-angle verification, verity_batch for up to 10 claims at once, and verity_agent for natural language queries. Each call costs between 0.10 and 0.75 USDC on Base. Maintains persistent memory across sessions if you pass a consistent caller_id, so it remembers what you've already checked. Useful when you need to validate information against current web sources or catch outdated claims in documentation and content.
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Tools
Public tool metadata for what this MCP can expose to an agent.
4 tools
verity_verifyVerify a claim, URL, or statement against live web sources. Returns CURRENT/OUTDATED/DISPUTED/UNVERIFIABLE verdict, confidence 0–100, sources, and what has changed. 0.10 USDC per call.2 params
Verify a claim, URL, or statement against live web sources. Returns CURRENT/OUTDATED/DISPUTED/UNVERIFIABLE verdict, confidence 0–100, sources, and what has changed. 0.10 USDC per call.
Parameters* required
claimstringThe claim, URL, or content to verify. E.g. 'Is GPT-4 still the most capable AI model?' or 'https://example.com/article'
caller_idstringOptional stable ID to activate persistent memory across calls.
verity_deep_checkThorough multi-angle verification with advanced search depth. Cross-references 5+ angles and authoritative sources. Higher confidence result for high-stakes fact-checks. 0.50 USDC per call.2 params
Thorough multi-angle verification with advanced search depth. Cross-references 5+ angles and authoritative sources. Higher confidence result for high-stakes fact-checks. 0.50 USDC per call.
Parameters* required
claimstringThe claim to deeply verify. E.g. 'Did the 2024 US election results change after court challenges?'
caller_idstringOptional stable ID for persistent memory.
verity_batchVerify up to 10 claims in one call. Returns an array of verdicts. Use for content audits and fact-check pipelines. 0.75 USDC for the batch.2 params
Verify up to 10 claims in one call. Returns an array of verdicts. Use for content audits and fact-check pipelines. 0.75 USDC for the batch.
Parameters* required
claimsarrayArray of claims to verify. Max 10.
caller_idstringOptional stable ID for persistent memory.
verity_agentNatural language fact-checking. Ask anything: 'Is this still true?', 'When was this last updated?', 'Check this URL'. VERITY selects the right strategy automatically. 0.10 USDC per call.2 params
Natural language fact-checking. Ask anything: 'Is this still true?', 'When was this last updated?', 'Check this URL'. VERITY selects the right strategy automatically. 0.10 USDC per call.
Parameters* required
querystringNatural language fact-check request. E.g. 'Is Elon Musk still the richest person in the world?'
caller_idstringOptional stable ID for persistent memory.
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
Featured
Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
One time payment $9 →Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
Start earning →Configuration
VERITY_PRIVATE_KEY*secretBase wallet private key (0x...) — used to sign x402 payments in USDC on Base. Per-call: 0.10 USDC (verify), 0.50 USDC (deep-check), 0.75 USDC (batch).