Secret Scanner MCP Server

secret-scanner 🔐

Catch leaked secrets in a diff/file before you commit, push or open a PR.

secret-scanner scans a blob of code, text or a unified git diff for leaked secrets and returns a CLEAN / REVIEW / LEAK verdict. Every finding includes the secret type, provider, severity and line:column, a masked excerpt (the full secret is never echoed), and a remediation note.

Detection is 100% local — the content you scan is never sent anywhere.

• MCP server for Claude / Cursor / any agent: npx -y secret-scanner-mcp
• Pay-per-call x402 API: POST /pro/scan ($0.02 USDC on Base, no sign-up)
• Free HTTP API: POST /scan (rate-limited)

What it catches

MCP server (free)

{
  "mcpServers": {
    "secret-scanner": { "command": "npx", "args": ["-y", "secret-scanner-mcp"] }
  }
}

Tool: scan_for_secrets — params content (string, required), deep (boolean, optional; adds offline format-validity hints).

Or connect over HTTP at POST /mcp (free).

HTTP API

# Free (rate-limited 30/h/IP)
curl -X POST https://secret-scanner.vercel.app/scan \
  -H 'content-type: application/json' \
  -d '{"content":"AWS_KEY=AKIAIOSFODNN7EXAMPLE"}'

# Paid, deep, unlimited (x402 — agent pays $0.02 USDC automatically)
curl -X POST https://secret-scanner.vercel.app/pro/scan \
  -H 'content-type: application/json' \
  -d '{"content":"<your diff>"}'

Example response:

{
  "verdict": "LEAK",
  "score": 80,
  "summary": "1 potential secret(s) across 1 line(s): AWS×1. Verdict LEAK.",
  "lines": 1,
  "findings": [
    {
      "rule": "aws-access-key-id",
      "title": "AWS Access Key ID",
      "provider": "AWS",
      "severity": "high",
      "line": 1,
      "column": 9,
      "match": "AKIA…MPLE (20 chars)",
      "remediation": "Rotate the IAM key immediately in the AWS console and remove it from history."
    }
  ],
  "meta": { "deep": false, "bytes": 28, "truncated": false, "rulesEvaluated": 35, "entropyFindings": 0 }
}

Why pay-per-call?

The free tier is rate-limited. The /pro/scan route is gated by x402: your agent pays $0.02 USDC per call on Base automatically — no account, no API key. It settles on-chain to the operator's receiving wallet. Deep mode adds offline structural-validity hints for formats whose shape can be verified without any network call.

Privacy

The scan runs in-process. The content you submit is not stored and not forwarded to any third party. Secrets in findings are always masked (AKIA…MPLE (20 chars)), never returned in full.

License

MIT