Blackwall X402 Guardrail vs Stillos Notary

In-depth architectural comparison of the Blackwall X402 Guardrail and Stillos Notary MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

Choose Blackwall X402 Guardrail when:

• You need dedicated capabilities in the Finance & Fintech domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore Blackwall X402 Guardrail Details

S

Choose Stillos Notary when:

• You need dedicated capabilities in the Finance & Fintech domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).
• Primary tools included: notary_commit, notary_claim_verdict, notary_screen_entity.

Explore Stillos Notary Details

Feature & Specification Comparison

Specification	Blackwall X402 Guardrail Finance & Fintech	S Stillos Notary Finance & Fintech
Summary	Keyless hosted MCP: pre-signature x402 payment verdict (GO/HOLD/STOP) with a signed receipt.	Signed, x402-paid StillOS notary tools: claim verdicts, OFAC screening, distress scoring.
Category & Scope	Finance & Fintech	Finance & Fintech

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "blackwall-x402-guardrail-3": {
      "command": "npx",
      "args": [
        "-y",
        "wrangler"
      ]
    }
  }
}

{
  "mcpServers": {
    "stillos-notary": {
      "command": "npx",
      "args": [
        "-y",
        "stillos-notary",
        "mcp"
      ]
    }
  }
}

Related MCP Server Comparisons