Verity

Real-time fact-checking MCP. Verifies claims against live sources with structured verdicts.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Not yet automatically verified

We haven't yet run this listing's install command through our automated sandbox check. This isn't a red flag — we're steadily working through the catalog.

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

{
  "mcpServers": {
    "verity": {
      "command": "npx",
      "args": [
        "verity-mcp"
      ]
    }
  }
}

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Capabilities & Tool Schemas (4)Self-reported

Inspect callable tools, capabilities, and parameters exposed to AI agents by Verity.

verity_verify

Verify a claim or URL against live sources

verity_deep_check

Multi-angle thorough verification

verity_batch

Verify up to 10 claims at once

verity_agent

Natural language fact-checking

Documentation Overview

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`OUTDATED`	Claim was true but has since been superseded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)

config.json

{
  "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

Code

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

config.json

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

Response:

config.json

{
  "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

Code

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

Built by BaseChain Labs

Read the full README →View source on GitHub →

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Adoption & maintenance

Factual signals from GitHub, npm, and our automated checks — not a rating.

npm downloads

184

Package downloads in the last 30 days.

Last commit

14d ago

Most recent push to the default branch.

Tools exposed

Callable tools this server registers over MCP.

Reviews

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Frequently Asked Questions about Verity

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "verity": { "command": "npx", "args": ["verity-mcp"] } }

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Technical Specs & Signals

CategoryDeveloper Tools

13/13 checks healthy over the last 45d

53Quality signal: Good · 53/100How this signal is calculated ▾

Server availabilityNot measured

Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership10/20

Documentation & tools24/30

Adoption & activity6/15

Community engagement0/10

A guidance signal from public completeness & health data — not a user rating. New listings start lower and rise as they add docs, get verified, and grow adoption. Signals we can't observe for a listing are skipped, not counted against it.

Supply-chain signal

No high-severity advisories surfaced by our automated scan.

Critical 0High 0Medium 0Low 0

Scanned 3d ago via OSV.dev · verity-mcp (npm)

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Documentation Overview

VERITY — Real-Time Fact-Checking Agent

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)

config.json

{
  "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

Code

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

config.json

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

Response:

config.json

{
  "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

Code

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

Built by BaseChain Labs