Fact Checker API MCP Server: Install & Setup

Install Fact Checker API in Claude Code

Claude Code

claude mcp add --transport sse fact-checker-api https://fact-checker.api.klymax402.com/mcp

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "fact-checker-api": {
      "url": "https://fact-checker.api.klymax402.com/mcp"
    }
  }
}

Verify claims with web evidence. Returns sources and verdict. x402 micropayment.

Probably not entirely. The listing mentions pay-per-call, credits or a subscription. Check the provider for current pricing.

Remote. Hosted by the provider. You connect with a URL, nothing to install.

Run: claude mcp add --transport sse fact-checker-api https://fact-checker.api.klymax402.com/mcp

com.factanker/factanker

Citable US facts w/ curated query templates: SEC financials, bank call reports, nonprofits. No key.

zvmzaretsky/crypto-safety-mcp

Read-only crypto safety: token honeypot checks, EIP-712 signature decode, approval scans.

io.github.snefhew/factline

EU company, sanctions, PEP and VAT checks, x402 pay guard, Dutch data. 5 checks a day free, no key.

zvmzaretsky/fabtally-guard-mcp

Verify before you act: deps-check, x402-preflight, json-repair & url-read for agents.

AlpineAIsih/factstamp

Verify a company, figure or citation before you rely on it. Card or crypto; signed receipt.

fablerlabs/x402-tools

Free catalog and 2,048-character secret-scan preview for Fabler's x402 agent tools on Base.