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com.blackwalltier/blackwall-x402-guardrail

by blackwalltier.com · remote · no sign-in to list tools · v0.1.2 · published by com.blackwalltier

Keyless hosted MCP: pre-signature x402 payment verdict (GO/HOLD/STOP) with a signed receipt.

Final · 1
CompareRegistry entry

1 tool: 1 do something that can't be undone.

Scanned Oct 21, 2026

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

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

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

1 tool

Can't be undone 1Claude Code: ask
  • forecast_paymentPre-signature x402 payment verdict: GO / HOLD / STOP for paying a counterparty, from settlement reputation, price-anomaly (quoted vs the payee's own median), and OFAC sanctions — w…No findings

    Why it is in this group

    • The name "forecast_payment" says "payment": a word that usually means money moves, which cannot be taken back.
    Description, as the server wrote it
    Pre-signature x402 payment verdict: GO / HOLD / STOP for paying a counterparty, from settlement reputation, price-anomaly (quoted vs the payee's own median), and OFAC sanctions — with a third-party-verifiable Ed25519 signed receipt. Verdict only; never takes custody. Free under $10 at risk; over that, returns an x402 payment challenge.

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 0.1.2. Values in angle brackets are yours to fill in.

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

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [],
    "ask": [
      "mcp__blackwall-x402-guardrail__forecast_payment"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as blackwall-x402-guardrail. Review it before you use it.