Blackwall X402 Guardrail

com.blackwalltier由 blackwalltier.com 发布官方发布者v0.1.2更新于 Oct 24, 2026

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

已验证Streamable HTTP可网页运行金融安全与监控

概览

AI 生成的概览

托管型远程 MCP，在代理签署 x402 付款前给出 GO/HOLD/STOP 风险判定，并附可验证的签名回执。

可以做什么
  • 按交易对手钱包、金额、资产和链请求付款判定，可选传入付款方、资源、代理 ID 与上下文。
  • 获得 GO、HOLD 或 STOP 以及原因和信号，依据结算信誉、报价相对收款方自身中位数的价格异常和 OFAC 制裁名单。
  • 取得 Ed25519 签名回执，第三方可依据公开密钥独立验证。
适用场景
当代理即将签署 x402 付款、需要先判断交易对手和价格是否安全时使用。适合需要可核查审计记录的自动化付款流程，它不托管资金也不参与结算。
运行要求
远程 Streamable HTTP 端点，无需安装、注册或 API 密钥。调用需提供 counterparty、amount、asset 和 chain。风险金额低于 10 美元时判定免费；达到或超过该额度时，工具返回 x402 付款挑战，代理须用自己的钱包支付并以 X-PAYMENT 请求头回传后重试。
安装前请注意
超过免费额度时，代理需用自己的钱包付款才能获得判定，涉及实际支出。工具只给判定、不托管资金，但 GO 并非保证。调用会转发至独立的 oracle 服务，回执公钥发布在另一主机，两者可用性都会影响结果；失败时返回错误而非 GO。

安装

在 SourceWeft 中

  1. 打开 控制台中的 Blackwall X402 Guardrail，将其添加到工作区。
  2. 为需要使用其工具的对话启用该服务。

Web executable，通过 Streamable HTTP。 远程服务在工作区中配置后即可从网页运行时运行。

交给智能体安装

把这段提示词粘贴到 Claude Code、Codex、Cursor 等智能体，或 SourceWeft 对话中。智能体会读取该服务器的安装指南，先向你展示发布者、端点和登录方式，经你同意后再把它添加到你的客户端。密钥不会写进任何命令。

阅读 https://sourceweft.com/mcp/com.blackwalltier%2Fblackwall-x402-guardrail/install.md，并按其中说明把这个 MCP 服务器接入我的客户端。修改任何配置之前，先告诉我它的发布者、端点和登录方式，等我确认。不要把 API 密钥写进命令或我会提交的文件；问我密钥应从哪里获取。

查看智能体所依据的安装指南

其他 MCP 客户端

把它添加到你客户端的 mcpServers 配置中。

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

README

Black_Wall remote MCP

A hosted remote MCP (Model Context Protocol over HTTP) that gives any MCP-capable agent a pre-signature payment-risk verdict — with no install and no signup. Add one URL and your agent can ask, before it signs an x402 payment, "should I pay this?" and get GO / HOLD / STOP — from counterparty settlement reputation, price-anomaly (quoted vs the payee's own median), and OFAC sanctions — plus a third-party-verifiable Ed25519 signed receipt.

Add it

Point your MCP client at:

https://mcp.blackwalltier.com

Transport: Streamable HTTP. No API key. Verdicts for amounts under $10 at risk are free; at or above that, the tool returns an x402 payment challenge your agent settles from its own wallet (pass the settled payment back as an X-PAYMENT header, then retry).

The tool: forecast_payment

field
counterpartystring, requiredrecipient wallet from the 402
amountstring, requireddecimal string, e.g. "0.09"
assetstring, requirede.g. USDC
chainstring, requirede.g. base
payer / resource / agent_id / contextoptionalbinds settlement / context

Returns a verdict (GO/HOLD/STOP) + reasons + signals, and a signed_receipt anyone can verify against the published key at https://agent-egress-proxy.onrender.com/.well-known/blackwall-receipt-key.json (any RFC 8032 Ed25519 library) — Black_Wall never has to be in the loop.

How it works

This Worker is a thin transport + proxy: it speaks minimal MCP JSON-RPC (initialize / tools/list / tools/call / ping) and forwards forecast_payment calls to the Black_Wall x402 oracle. All decision logic and the receipt come from the oracle unchanged.

Fail-closed by design: if the oracle errors, is unreachable, or returns a non-verdict, the tool returns an error — never a phantom GO. A payment guardrail that can't reach its backend must not imply "safe to pay."

Registry

Published to the official MCP Registry as com.blackwalltier/blackwall-x402-guardrail.

Develop

sh
node test.mjs        # unit tests (mocked oracle)npx wrangler dev     # run locallynpx wrangler deploy  # deploy (Cloudflare Workers)

By BlueTier. Verdict only — never takes custody, never in the settlement path. No evidence is not trust.

来源：README.md，提交 4a69626

工具

1

forecast_payment

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.

输入参数asset必填chain必填payeramount必填contextagent_idresourcecounterparty必填

版本历史

1
  1. v0.1.2最新Sep 16, 2026

评分

已满足适用检查项的 90%

该评分衡量此收录条目的完整程度，依据注册中心条目、端点与公开来源计算得出。它不是对服务器本身的评价，也不表示服务器安全或当前可用：可连通性是带日期的检查结果，评分也不包含安装量或用户评价。

  • 近 30 天内可连通必需25 分
  • 已声明认证方式必需10 分
  • 已列出工具必需15 分
  • 描述必需15 分
  • 图标10 分
  • 文档15 分
  • 许可证10 分

    请在仓库或注册中心条目中声明许可证。

其他 Blackwalltier 集成

Blackwall

com.blackwalltier

本地 MCP 护栏，在智能体执行高风险操作前评分，并返回 GO、CAUTION 或 STOP 结论及风险标记。

STDIO仅桌面
开发者工具尚未验证Oct 24, 2026