MCP server

x402 Doctor

com.twelvepermissions/x402-doctor

Checked 28 Oct 2026, 09:03 UTC · Connected to it and listed its tools

Diagnose x402 seller endpoints: what is wrong with your 402 challenge, and how to fix it.

Working at last checkVerified publisher: twelvepermissions.comAbout 372 tokens per request once connected3 tools

https://x402-doctor.tsharpe.workers.dev/mcp

At a glance

Type: MCP server
Publisher: twelvepermissions.com (verified by the MCP Registry)
Status: Working at last check
Tools: 3
Token cost: About 372 tokens per request
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok
Last checked: 28 Oct 2026, 09:03 UTC

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http x402-doctor https://x402-doctor.tsharpe.workers.dev/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.x402-doctor]
url = "https://x402-doctor.tsharpe.workers.dev/mcp"

Gemini CLI

{"mcpServers":{"x402-doctor":{"httpUrl":"https://x402-doctor.tsharpe.workers.dev/mcp"}}}

Cursor

{"mcpServers":{"x402-doctor":{"url":"https://x402-doctor.tsharpe.workers.dev/mcp"}}}

VS Code

{"servers":{"x402-doctor":{"type":"http","url":"https://x402-doctor.tsharpe.workers.dev/mcp"}}}

Antigravity

agy mcp add x402-doctor https://x402-doctor.tsharpe.workers.dev/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"x402-doctor","server_url":"https://x402-doctor.tsharpe.workers.dev/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"x402-doctor","server_url":"https://x402-doctor.tsharpe.workers.dev/mcp"}

explain_defect ~93 tokens
Full explanation of one rule by id — what it checks, why it matters, how to fix it, and where the rule came from. Use when you want the reasoning without re-probing.
list_checks ~61 tokens
The whole rule table. Knowing what was NOT checked is part of knowing what a clean result means.
probe_x402_endpoint ~218 tokens
Probe an x402 seller endpoint and report what it observes about it. Performs the handshake a paying client would: GET with no X-PAYMENT header, then checks the 402 challenge against 16 rules. Every finding says whether the rule comes from the x402 spec or from an observed facilitator rejection. Repo

Maxwell Directory (x402 + MCP)
Local providers worldwide, plus travel and public data. Free search; paid answers via x402.
x402 Doctor
Is this x402/MPP API safe to pay? $0.001 preflight, fixes, a $0.25 test purchase. Free quick check.
agenteconomy.cloud
x402 seller trust for AI agents: verify on-chain revenue, check delivery, diagnose listings.
GW8 Signal API
Pay-per-call crypto signals, token verdicts, flows & briefs. x402 USDC on Base. Signal-only.
cryptofeed402
Hyperliquid perp funding, OI, preflight & news sentiment for agents. Pay per call in USDC (x402).
DDG Agent Services
Pay-per-call x402 gateway: agent tools, OpenAI-compatible LLM, market data, RPC, security audits.
Surewhynot Quartermaster
x402 toolkit for AI agents: paid web, AI, and Base chain tools per call in USDC. Free tools too.
Automaton Token Safety
Base L2 token safety for AI agents: honeypot scans, swap simulation, approval and liquidity risk.

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