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402MCP.org — HTTP 402 & Agent Payment Registry

warnings

402mcp.org

Decode HTTP 402 challenges (L402, x402, MPP) and choose agent payment rails from an open registry.

https://402mcp.org/api/v1/mcpWebsiteNo authMCP 2025-11-25v1.1.1last checked 16 Oct 2026spoke MCP on 1 of 1 check (30 days)initialize in 778 ms

Will my client connect?

Decided from what the probe found at the endpoint, and from what each client's own documentation says it can complete. Every row carries the day that documentation was read.

✓Claude CodeConnects

The endpoint answers an anonymous handshake, so no credential is needed.

claude mcp add --transport http 402mcp-org-http-402-agent-payment-registry https://402mcp.org/api/v1/mcp

Claude Code docs · read on 2026-08-30

✓Claude (claude.ai & Desktop)Connects

The endpoint answers an anonymous handshake, so no credential is needed.

Settings → Connectors → Add custom connector, then paste https://402mcp.org/api/v1/mcp.

Claude (claude.ai & Desktop) docs · read on 2026-08-30

✓ChatGPTConnects

The endpoint answers an anonymous handshake, so no credential is needed.

Settings → Apps → Advanced settings → Developer mode, then create a connector pointing at https://402mcp.org/api/v1/mcp.

ChatGPT docs · read on 2026-08-30

✓CursorConnects

The endpoint answers an anonymous handshake, so no credential is needed.

{
  "mcpServers": {
    "402mcp-org-http-402-agent-payment-registry": {
      "url": "https://402mcp.org/api/v1/mcp"
    }
  }
}

Cursor docs · read on 2026-08-30

✓VS Code (Copilot)Connects

The endpoint answers an anonymous handshake, so no credential is needed.

{
  "servers": {
    "402mcp-org-http-402-agent-payment-registry": {
      "type": "http",
      "url": "https://402mcp.org/api/v1/mcp"
    }
  }
}

VS Code (Copilot) docs · read on 2026-08-30

How to authenticate

Checked against the endpoint by our probe on 16 Oct 2026. These are the capabilities the server advertises, not a prediction about any particular client.

Scheme	No auth
Protected-resource metadata	✕Not found Without it a client has to guess where the authorization server lives.
Anonymous access	Handshake succeeds; 7 tools listable
Credentials demanded in prose	✕decode_402_challenge These tools are listed anonymously and their own descriptions ask for an account or key, but no challenge is issued — so a client has nothing to act on and the refusal arrives as a tool error.

What the probe found

warningTools needing credentials are listed without a challenge

1 of the 7 tools listed anonymously say in their own descriptions that they need an account or a key (decode_402_challenge), but the endpoint issued no WWW-Authenticate challenge. The requirement is stated only in prose, so a call reaches the tool and comes back as a tool error instead of an authorization step.

Tools

decode_402_challengeget_best_payment_solutionget_scheme_referenceget_solutionprobe_402_supportrecommend_payment_railsearch_402_solutions

Contract history

16 Oct 2026v1.1.1first recorded contract

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Status badge

Status for a README, from the last probe — cached an hour, so up to seven hours behind the endpoint. Links back to this page.

[![MCP status](https://mcpi.app/servers/402mcp-org-http-402-agent-payment-registry/badge.svg)](https://mcpi.app/servers/402mcp-org-http-402-agent-payment-registry)