Blackwall X402 Guardrail MCP server

Connect Blackwall X402 Guardrail and your agent gets 1 tool, among them forecast_payment. It answers at https://mcp.blackwalltier.com over streamable HTTP, and it listed its tools to an anonymous client, so no sign-in was needed for that. Our probes reached it 10 of 10 times since 4 September 2026; the last check, on 18 October 2026, succeeded.

Pre-signature x402 payment verdict (GO/HOLD/STOP) for AI agents, with a verifiable signed receipt.

Description as the publisher wrote it.

The 1 tool Blackwall X402 Guardrail offers

Add Blackwall X402 Guardrail to your AI client

Every block below points at https://mcp.blackwalltier.com. Pick your client and copy.

claude mcp add --transport http blackwall-x402-guardrail https://mcp.blackwalltier.com

{
  "mcpServers": {
    "blackwall-x402-guardrail": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://mcp.blackwalltier.com"]
    }
  }
}

{
  "mcpServers": {
    "blackwall-x402-guardrail": {
      "url": "https://mcp.blackwalltier.com"
    }
  }
}

{
  "servers": {
    "blackwall-x402-guardrail": {
      "type": "http",
      "url": "https://mcp.blackwalltier.com"
    }
  }
}

{
  "context_servers": {
    "blackwall-x402-guardrail": {
      "url": "https://mcp.blackwalltier.com"
    }
  }
}

{
  "mcpServers": {
    "blackwall-x402-guardrail": {
      "serverUrl": "https://mcp.blackwalltier.com"
    }
  }
}

{
  "mcpServers": {
    "blackwall-x402-guardrail": {
      "url": "https://mcp.blackwalltier.com"
    }
  }
}

name: Blackwall X402 Guardrail
version: 0.0.1
schema: v1
mcpServers:
  - name: Blackwall X402 Guardrail
    type: streamable-http
    url: https://mcp.blackwalltier.com

{
  "mcpServers": {
    "blackwall-x402-guardrail": {
      "httpUrl": "https://mcp.blackwalltier.com"
    }
  }
}

{
  "mcpServers": {
    "blackwall-x402-guardrail": {
      "type": "http",
      "url": "https://mcp.blackwalltier.com"
    }
  }
}

{
  "mcpServers": {
    "blackwall-x402-guardrail": {
      "url": "https://mcp.blackwalltier.com"
    }
  }
}

goose://extension?url=https%3A%2F%2Fmcp.blackwalltier.com&type=streamable_http&id=blackwall-x402-guardrail&name=Blackwall%20X402%20Guardrail

Is Blackwall X402 Guardrail up right now?

It answered our last check on 18 October 2026 in 131 ms. Over 10 checks since 4 September 2026 it answered 10. Status here comes from Neuronto's own probes, not from the publisher.

MCP servers similar to Blackwall X402 Guardrail

Questions about Blackwall X402 Guardrail

Is there an official Blackwall X402 Guardrail MCP server?

Yes. It is published by blackwalltier.com and served from mcp.blackwalltier.com, the vendor's own domain: https://mcp.blackwalltier.com.

How many tools does Blackwall X402 Guardrail have?

1, as returned by the server's own tools/list on 10 September 2026: forecast_payment.

Is Blackwall X402 Guardrail down?

It answered our last check on 18 October 2026 in 131 ms. Over 10 checks since 4 September 2026 it answered 10.

How do I add Blackwall X402 Guardrail to Cursor?

Put the server under mcpServers in ~/.cursor/mcp.json with the URL https://mcp.blackwalltier.com. The exact JSON is above, with the same setup for Claude Code, Claude Desktop, VS Code, Windsurf, Zed, Gemini CLI and the rest.

Does Blackwall X402 Guardrail need an API key?

It listed its tools to an anonymous client, so reading the tool list needs no key. Individual tools can still ask for credentials in their own inputs.

Where this comes from

Publisher: com.blackwalltier. Endpoint host: mcp.blackwalltier.com. ARD identifier: urn:air:com.blackwalltier:mcp:blackwall-x402-guardrail. First indexed 31 August 2026. The tools are exactly what the server returned; nothing on this page is inferred from its name. Ranking in Neuronto search is never for sale.