MCP server

402MCP.org — HTTP 402 & Agent Payment Registry Official

org.402mcp/registry

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

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

Website Source

At a glance

Type

MCP server

Publisher

402mcp.org (verified by the MCP Registry)

Status

Working at last check

Tools

7

Token cost

About 1,699 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

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 registry https://402mcp.org/api/v1/mcp

Claude Desktop

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

Codex (config.toml)

[mcp_servers.registry]
url = "https://402mcp.org/api/v1/mcp"

Gemini CLI

{"mcpServers":{"registry":{"httpUrl":"https://402mcp.org/api/v1/mcp"}}}

Cursor

{"mcpServers":{"registry":{"url":"https://402mcp.org/api/v1/mcp"}}}

VS Code

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

Antigravity

agy mcp add registry https://402mcp.org/api/v1/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":"registry","server_url":"https://402mcp.org/api/v1/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"registry","server_url":"https://402mcp.org/api/v1/mcp"}

Tools

• decode_402_challenge ~318 tokens
  Call this whenever an HTTP response has status 402, or carries a WWW-Authenticate (L402, LSAT or Payment) or PAYMENT-REQUIRED header. Identifies the payment scheme (L402, x402 v1/v2, MPP), decodes the invoice, macaroon or payment requirements, and returns the exact steps and headers needed to pay an
• get_best_payment_solution ~143 tokens
  Return whichever solution currently holds rank 1 on 402MCP.org, with its full breakdown, install commands and code. Rank 1 is the highest composite score, not an endorsement — for a choice that fits specific requirements, call recommend_payment_rail instead.
• get_scheme_reference ~127 tokens
  Protocol reference for L402, x402 or MPP: challenge, credential and receipt headers, encodings, the request/response flow, an example, and links to the specifications. Use when implementing a client or server.
• get_solution ~216 tokens
  Return one solution in full: summary, advantages and trade-offs, the six criterion scores with rationale, install commands, verified code samples, sources, maturity and the date its claims were last verified.
• probe_402_support ~160 tokens
  Make one GET (or HEAD) request to a public URL and report whether it answers with an HTTP 402 payment challenge, which scheme, and the decoded terms. Redirects are reported, not followed. Private and local addresses are refused. Never pays anything.
• recommend_payment_rail ~487 tokens
  Choose an HTTP 402 payment solution from requirements rather than from rank. Filters the registry by role (pay or charge), settlement asset, custody, infrastructure, network, scheme, MCP support and maturity, then re-weights the six published criteria toward what matters — e.g. sub-cent amounts weig
• search_402_solutions ~248 tokens
  Search the 402MCP.org registry of HTTP 402 payment solutions (L402, x402, MPP). Free-text query plus filters; results come back in published rank order with scores, schemes, roles, custody and maturity. Call with no arguments to list the whole registry.

Browse

• Payments
• Invoicing and accounting

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