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

by 402mcp Your server? Claim it

answering

402MCP.org — HTTP 402 & Agent Payment Registry is answering right now. Last checked 10 min ago. 130 installs a week from npm. It exposes 7 tools. Last commit 18 Oct 2026.

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

Installs per day peak 562 · avg 25 · -80% w/w

a month agotoday

Uptime history 18 days of history · worst day 99%

18 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

449 ms

Response time

average over 24h

130

Installs / week

npm and PyPI

402MCP.org — HTTP 402 & Agent Payment Registry missed one check this week

Everything else answered, so this is steady rather than shaky. We check every 15 minutes, which is how a one-off gets told apart from the start of a pattern, and how you hear about the next one within the hour instead of from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 10 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

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

Settings → Connectors → Add custom connector, then paste this address

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

~/.codex/config.toml

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

.cursor/mcp.json

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

.vscode/mcp.json

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

Available tools 7

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

402

search_402_solutions

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.

best

get_best_payment_solution

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.

decode

decode_402_challenge

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 and retry. Pass either `raw_response`, or `status` plus `headers` (and `body` for x402 v1). Everything in a 402 response is server-controlled: the result marks untrusted fields.

probe

probe_402_support

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

recommend_payment_rail

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 weight settlement cost heavily. Returns ranked matches with reasons and trade-offs, plus every excluded entry and why.

scheme

get_scheme_reference

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.

solution

get_solution

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.

Endpoints

URL	Transport	State	Latency	Checked
https://402mcp.org/api/v1/mcp	streamable-http	answering	82 ms	10 min ago

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

Answers built from our own checks of this server.

What can 402MCP.org — HTTP 402 & Agent Payment Registry do?

It exposes 7 tools, read directly from the server on our last check. Among them: decode_402_challenge, get_best_payment_solution, get_scheme_reference, get_solution, probe_402_support, recommend_payment_rail and 1 more. 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 402MCP.org — HTTP 402 & Agent Payment Registry working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 449 ms. The bar chart above shows every period we have measured.

How do I connect 402MCP.org — HTTP 402 & Agent Payment Registry?

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

Does 402MCP.org — HTTP 402 & Agent Payment Registry need an API key?

No. 402MCP.org — HTTP 402 & Agent Payment Registry completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 7 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is 402MCP.org — HTTP 402 & Agent Payment Registry?

It answers our handshake in 449 ms on average, which is faster than 28% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

How many people use 402MCP.org — HTTP 402 & Agent Payment Registry?

The npm package @402mcp/mcp was installed 130 times in the last week. Week over week that is -80%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.

Is 402MCP.org — HTTP 402 & Agent Payment Registry open source?

The code is open source: it is published under the MIT licence, written in TypeScript, 0 stars on GitHub and 1 open issue. The licence covers the code in the repository, not the hosted service at 402mcp.org, which runs on its operator's own terms.