x402 Doctor
Diagnose x402 seller endpoints: what is wrong with your 402 challenge, and how to fix it.
MCP server · by twelvepermissions.com
About
x402 Doctor is an MCP server published by twelvepermissions.com. Marketplaces we read that list it: 1 (Official MCP Registry). We first saw it on 2026-10-11 and have recorded no change since. As of our marketplace pass on 2026-10-16.
What it asks for
- Runs remotely
None of the marketplaces we read publishes its tools or the settings it asks for.
What it declares, asks for and runs, in full
Only install plugins from developers you trust. We list what marketplaces publish and do not test plugins.
Works with
- Claude Code
- Codex
- Cursor
- VS Code
- Copilot CLI
A one-click link opens the client, which asks you to confirm before it adds the server.
From the marketplaces that list it and the MCP transport it declares, as each client documents them. We do not test plugins.
Connect
Commands and configs built only from what its marketplaces declare. We do not run them for you and do not test plugins.
As a remote MCP server
Built from what Official MCP Registry declares.
claude mcp add --transport http x402-doctor https://x402-doctor.tsharpe.workers.dev/mcp[mcp_servers.x402-doctor]
url = "https://x402-doctor.tsharpe.workers.dev/mcp"{
"mcpServers": {
"x402-doctor": {
"url": "https://x402-doctor.tsharpe.workers.dev/mcp"
}
}
}Where it is published
| Marketplace | Status | Version | Figures | Verified | First seen |
|---|---|---|---|---|---|
| Official MCP Registry (Open the registry record) | Listed | 1.0.0 | Forks (GitHub): 0 Stars (GitHub): 0 |
Not marked |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
What changed
Nothing has moved on this plugin since we started watching it.
Similar plugins
Products whose own names, descriptions, tools and skills are closest in meaning to this one, on every marketplace we read. Closeness is ranked within this list only.
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Measured x402 ecosystem data, facilitator reliability, and live endpoint checks.
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AgentObserver - Check x402 Dependencies Before Paying
Check Exa, BlockRun, OneSource, Apify and other x402 dependencies before invoking or paying.
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x402-audit-mcp io.github.robertoyanguas-ops/x402-audit-mcp
Audits any URL for HTTP 402 x402 V2 compliance, PAYMENT-REQUIRED headers, Bazaar schema, and MCP.
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Pay less for x402 APIs: free pre-payment checks, cheapest working service finder, web/PDF reader.
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Free MCP troubleshooting-preview tools; purchases stay human-directed.
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Ask probe402's public record about an x402 or MPP endpoint before an agent pays it.
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Check an x402 endpoint before your agent pays: pay, skip or recheck. Plus a verified x402 catalog.
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UOS Genesis x402 Machine Utilities
Paid x402 MCP utilities for AI agents on Base: JSON, HTML, CSV, hashing, attestations.
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tools dev.workers.sebastiaan-ba3.mcpgateway/tools
Doormat Capital's paid x402 safety tools (token scan, HTTP security headers) for AI agents.
-
Discover and call 2,000+ x402 machine-payable services through one graded API key + gateway.
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Found by meaning, not by shared code or a shared repository: similar plugins stay separate products, and this is not a review or a recommendation.
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Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.