Mmcp.market

Blackwall X402 Guardrail MCP server

by blackwalltier.com·com.blackwalltier/blackwall-x402-guardrail·v0.1.2
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Keyless hosted MCP: pre-signature x402 payment verdict (GO/HOLD/STOP) with a signed receipt.

A87/100grade A
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Safety scan
A87/100

full report

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Nobody has reviewed Blackwall X402 Guardrail yet.

If you have run it, two minutes of your experience saves the next person an afternoon.

Blackwall X402 Guardrail tools (1)

write = sends, deletes, buys or posts
  • forecast_paymentFree

    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.

Public scan report

scanner v0.1.9 · 2026-09-21 · same rubric, same numbers if you re-run it

no findings
  • –Code scanremote-only server, no package to scann/a
  • Live reliabilityremote reachable in 188ms20/20
  • Tool poisoning1 tool descriptions checked15/15
  • Auth qualityopen endpoint, read-only tools10/15
  • Maintenancelast push 27 days ago15/15
  • Maintainer identitynamespace and repository owner differ; website matches verified namespace5/10
Overall 87/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

Install directly

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

Blackwall X402 Guardrail: common questions

Is Blackwall X402 Guardrail MCP server safe?
Yes, by our scan: it is graded A (87/100). Read the Blackwall X402 Guardrail safety report
How do I install Blackwall X402 Guardrail?
It runs remotely at mcp.blackwalltier.com. Add it to Claude Code, Claude Desktop or Cursor with the snippets above, or call it through the mcp.market gateway without installing anything.
Does Blackwall X402 Guardrail need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Blackwall X402 Guardrail maintained?
The last commit was 27 days ago (2026-08-25). The latest release is v0.1.2.
Is Blackwall X402 Guardrail up?
100% of our last 9 checks got an answer. We check remote servers about four times a day.
What can I use instead of Blackwall X402 Guardrail?
Servers from other publishers that do the same job: POPCORN MCP server, Pulse Verity MCP server and X402 Payment Safety MCP server. Compare all Blackwall X402 Guardrail alternatives.

Alternatives to Blackwall X402 Guardrail

Same job from other publishers: the closest match first, then the best rated.

All Blackwall X402 Guardrail alternatives →
  • POPCORN MCP
    Signed time and SHA-256 witness receipts for agents, with offline verification and x402 payment.
    B
  • Pulse Verity
    Read crypto reference prices and verify signed receipts. Includes limited keyless samples.
    B
  • X402 Payment Safety
    Authorize x402 payments before signing with request-bound, signed safety decisions.
    A
  • X402 List
    Find and vet x402 payment APIs before your agent pays one: uptime, price, on-chain volume.
    A
  • PipRail
    Budget-bound x402 payment wallet for AI agents — pays HTTP 402 URLs, capped locally. No backend.
    B
Blackwall X402 Guardrail vs POPCORN MCPBlackwall X402 Guardrail vs Pulse VerityBlackwall X402 Guardrail vs X402 Payment Safety

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