mcpbeat

Keryx MCP Server

io.github.tang-vu/keryx
answering

Keryx is answering right now. Last checked 13 min ago. 36 installs a week from npm. It exposes 2 tools. Last commit 4 Aug 2026.

Autonomous research agent that pays every source it cites in USDC on Arc via x402 micropayments.

Installs per day peak 27 · avg 7 · -14% w/w
a month agotoday
Uptime history 41 hours of history
41 hours agonow
100.0%
Uptime 24h
91 of 91 checks
2
Tools
read from the server
756 ms
Response time
average over 24h
36
Installs / week
npm and PyPI

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 13 min ago.

run in your terminal
claude mcp add keryx --transport http https://keryx.cc/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "keryx": {
      "url": "https://keryx.cc/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.keryx]
url = "https://keryx.cc/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "keryx": {
      "url": "https://keryx.cc/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "keryx": {
      "url": "https://keryx.cc/mcp"
    }
  }
}

Available tools 2

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

keryx
keryx_status
Describe this MCP surface, its payment behavior, and the active caller tier.
research
research
Research a question under a USDC creator-payment budget. Keryx selects sources, pays access tolls and weighted citation rewards, then returns a grounded answer and receipt.

Endpoints

URLTransportStateLatencyChecked
https://keryx.cc/mcp streamable-http answering 885 ms 13 min ago

Keryx — questions

Answers built from our own checks of this server.

What can Keryx do?
It exposes 2 tools, read directly from the server on our last check. Among them: keryx_status, research. 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 Keryx 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 756 ms. The bar chart above shows every period we have measured.
How do I connect Keryx?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Keryx need an API key?
No. Keryx completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 2 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Keryx?
It answers our handshake in 756 ms on average, which is faster than 11% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.
How many people use Keryx?
The npm package keryx-mcp was installed 36 times in the last week. Week over week that is -14%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is Keryx open source?
Yes — written in TypeScript and 2 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.