{
  "markdown": "# Black_Wall remote MCP\n\nA hosted **remote MCP** (Model Context Protocol over HTTP) that gives any\nMCP-capable agent a pre-signature **payment-risk verdict** — with no install and\nno signup. Add one URL and your agent can ask, before it signs an x402 payment,\n*\"should I pay this?\"* and get **GO / HOLD / STOP** — from counterparty\nsettlement reputation, price-anomaly (quoted vs the payee's own median), and OFAC\nsanctions — plus a **third-party-verifiable Ed25519 signed receipt**.\n\n## Add it\n\nPoint your MCP client at:\n\n```\nhttps://mcp.blackwalltier.com\n```\n\nTransport: **Streamable HTTP**. No API key. Verdicts for amounts **under $10 at\nrisk are free**; at or above that, the tool returns an **x402 payment challenge**\nyour agent settles from its own wallet (pass the settled payment back as an\n`X-PAYMENT` header, then retry).\n\n## The tool: `forecast_payment`\n\n| field | | |\n|---|---|---|\n| `counterparty` | string, required | recipient wallet from the 402 |\n| `amount` | string, required | decimal string, e.g. `\"0.09\"` |\n| `asset` | string, required | e.g. `USDC` |\n| `chain` | string, required | e.g. `base` |\n| `payer` / `resource` / `agent_id` / `context` | optional | binds settlement / context |\n\nReturns a verdict (`GO`/`HOLD`/`STOP`) + reasons + signals, and a\n`signed_receipt` anyone can verify against the published key at\n`https://agent-egress-proxy.onrender.com/.well-known/blackwall-receipt-key.json`\n(any RFC 8032 Ed25519 library) — Black_Wall never has to be in the loop.\n\n## How it works\n\nThis Worker is a **thin transport + proxy**: it speaks minimal MCP JSON-RPC\n(`initialize` / `tools/list` / `tools/call` / `ping`) and forwards\n`forecast_payment` calls to the Black_Wall x402 oracle. All decision logic and\nthe receipt come from the oracle unchanged.\n\n**Fail-closed by design:** if the oracle errors, is unreachable, or returns a\nnon-verdict, the tool returns an error — **never a phantom `GO`**. A payment\nguardrail that can't reach its backend must not imply \"safe to pay.\"\n\n## Registry\n\nPublished to the official MCP Registry as\n`com.blackwalltier/blackwall-x402-guardrail`.\n\n## Develop\n\n```sh\nnode test.mjs        # unit tests (mocked oracle)\nnpx wrangler dev     # run locally\nnpx wrangler deploy  # deploy (Cloudflare Workers)\n```\n\nBy BlueTier. Verdict only — never takes custody, never in the settlement path.\n*No evidence is not trust.*\n",
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  "sha": "b012b3a3941afe217abc6c5aa2cd5694cc0ab8e2b2643d2c6149968fae3f6319",
  "repo_slug": "bluetieroperations-create/blackwall-x402-mcp",
  "fonte": "repo",
  "truncated": false,
  "api": "https://agentalog.com/api/listings/mcp_com_blackwalltier_blackwall_x402_guardra_4fd80962/readme"
}