# mcpcost

> Health and token cost of every remote server in the official MCP registry, and of its npm and PyPI package servers. We probe each server each day. The site answers two questions for 24 000+ servers: Is this MCP server alive? How many context tokens does it cost?

Token counts: claudeTokens is exact. It comes from the Anthropic count_tokens endpoint for claude-opus-5-5: one request with the server's tools plus a marker tool, one with the marker only, the difference is the cost of the tools. claudeTokensClaudeCode is the same with the Claude Code prefix mcp__<server>__ on each tool name. toolsTokens is an estimate: compact JSON of each tool (name, description, input_schema) counted with o200k_base. The exact count is about 1.9 times the estimate. A tool-use system prompt (286 tokens on Claude Opus 5.5) is added one time per request and is not in any number.

## Pages
- https://mcpcost.ulehla.dev/ : overview and a live check form
- https://mcpcost.ulehla.dev/tokens : how many context tokens an MCP server costs, with current percentiles
- Package (stdio) servers from npm and PyPI are probed too, in a container with the network off; their page shows the npx or uvx command.
- https://mcpcost.ulehla.dev/s/<name>.xml : Atom feed of one server, an entry for every probe that changed its result, tool count or token cost
- https://mcpcost.ulehla.dev/changes : what changed since the previous run (new, removed, down, back, tool sets that grew or shrank); Atom feed at /changes.xml
- https://mcpcost.ulehla.dev/s/<registry name> : one server, for example https://mcpcost.ulehla.dev/s/com.replynodes/mcp
- https://mcpcost.ulehla.dev/servers?q=<words>&status=ok&sort=claude : search and filters (sort=tokens for the estimate)
- https://mcpcost.ulehla.dev/check?target=<https url> : probe a server that is not in the registry
- https://mcpcost.ulehla.dev/statistics, /hosts, /methodology

## Machine access
- JSON, one server: https://mcpcost.ulehla.dev/api/s/<registry name>.json
- JSON, search: https://mcpcost.ulehla.dev/api/servers.json?q=<words>&status=ok&sort=claude&page=1
- JSON, live probe: https://mcpcost.ulehla.dev/api/check.json?url=<https url>
- JSON, run summary: https://mcpcost.ulehla.dev/api/summary.json
- MCP server (Streamable HTTP, no auth): https://mcpcost.ulehla.dev/mcp with tools lookup_server, search_servers, check_server, registry_summary
- CLI for your own config: npx mcpcost (https://www.npmjs.com/package/mcpcost)
- Source and raw data: https://github.com/ondraulehla/mcpcost (MIT)