Is the verity MCP server free to use?

Yes. verity is listed on AllMCPs as a free, open Model Context Protocol server you can install into Claude Desktop, Cursor, or any MCP-compatible client.

Is the verity MCP server free to use?

Yes. verity is listed on AllMCPs as a free, open Model Context Protocol server you can install into Claude Desktop, Cursor, or any MCP-compatible client.

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 ▾

Install Config Generator

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claude_desktop_config.json

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

💡 Paste into ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows)

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`OUTDATED`	Claim was true but has since been superseded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

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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": ["-y", "verity"] } }

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Technical Specs & Signals

CategoryDeveloper Tools

51Quality signal: Good · 51/100How 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 & activity4/15

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.

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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