X402 Payment Safety MCP Server

by agenttanuki Your server? Claim it

answering

X402 Payment Safety is answering right now. Last checked 3 min ago. It exposes 1 tools. Last commit 8 Sep 2026.

Authorize x402 payments before signing with request-bound, signed safety decisions.

Uptime history 26 days of history · worst day 98%

26 days agonow

100.0%

Uptime 24h

93 of 93 checks

Tools

read from the server

1041 ms

Response time

average over 24h

Stars

last commit 8 Sep 2026

What changed 13

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 16 August 2026. No other catalogue keeps this.

7 Sep a tool changed version

31 Aug a tool changed version5 times that day

27 Aug a tool changed version2 times that day

16 Aug a tool changed version5 times that day

and 9 more, back to 16 August 2026

What the code does

We read the source, 16 h ago · tools taken from the live server · rules 3dff92dd89df

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Builds a file path from a variable live/experiments/adoption_sweep.py:416, live/guild/app/main.py:4411

        path = os.path.join(OUT, f"sweep_{ax}.json")

Runs an external command live/experiments/llm_adoption.py:217, live/market_clients/run_live_demo.py:82

        os.system(f"{sys.executable} -m pip install -q openai")

Dumps the whole environment live/market_clients/run_live_demo.py:80

    env = dict(os.environ)

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 3 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add x402-payment-safety --transport http https://agent-guild-5d5r.onrender.com/mcp/payment-safety/

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "x402-payment-safety": {
      "url": "https://agent-guild-5d5r.onrender.com/mcp/payment-safety/"
    }
  }
}

~/.codex/config.toml

[mcp_servers.x402-payment-safety]
url = "https://agent-guild-5d5r.onrender.com/mcp/payment-safety/"

.cursor/mcp.json

{
  "mcpServers": {
    "x402-payment-safety": {
      "url": "https://agent-guild-5d5r.onrender.com/mcp/payment-safety/"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "x402-payment-safety": {
      "url": "https://agent-guild-5d5r.onrender.com/mcp/payment-safety/"
    }
  }
}

Available tools 1

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

guild

guild_x402_payment_safety

PAID. Call this immediately BEFORE signing an x402 payment envelope. Returns one short-lived, Guild-signed AGPD-1 allow/block credential bound to the exact target payment: scheme, CAIP-2 network, asset contract, atomic amount, payee and resource URL, plus optional capability and policy thresholds. Verify it offline with POST /wallet-binding/decision/verify. This is the native MCP transport for the existing HTTP POST /wallet-binding/decision product. An unpaid call returns a complete x402 v2 challenge for the exact request digest. Retry with the official ``_meta['x402/payment']`` carrier; adapters that cannot set request metadata may pass the identical signed PaymentPayload as ``x402_payment``. Conflicting carriers fail closed before facilitator verification or settlement. The decision is issued before metering, so malformed inputs or signing failures are never charged. ``api_key`` uses sandbox credits and is never external revenue. The free identity-only alternative is GET /wallet-binding/resolve.

Endpoints

URL	Transport	State	Latency	Checked
https://agent-guild-5d5r.onrender.com/mcp/payment-safety/	streamable-http	answering	586 ms	3 min ago

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X402 Payment Safety — questions

Answers built from our own checks of this server.

What can X402 Payment Safety do?

It exposes 1 tools, read directly from the server on our last check. Among them: guild_x402_payment_safety. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is X402 Payment Safety working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 93 of 93 checks got a reply (100.0%), average response time 1041 ms. The bar chart above shows every period we have measured.

How do I connect X402 Payment Safety?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does X402 Payment Safety need an API key?

No. X402 Payment Safety completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 1 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is X402 Payment Safety?

It answers our handshake in 1041 ms on average, which is faster than 8% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is X402 Payment Safety open source?

Yes — it is published under the Apache-2.0 licence, written in Python, 1 stars on GitHub and 20 open issues. The source link is on this page, so you can read exactly what it does with your data before you connect it.