Litport Free Proxy MCP Server
A local, stdio Model Context Protocol server that gives an MCP
client (Claude Desktop, Claude Code, or any other MCP-compatible agent) three bounded, read-only
tools over Litport's public free-proxy snapshot: list verified HTTP, SOCKS4, and SOCKS5 proxies,
pick the highest-ranked ones, and summarize the current snapshot. It never forwards traffic, never
accepts arbitrary URLs from tool callers, and exposes no write or side-effecting tools; it is a thin
wrapper around @litportnet/free-proxy-sdk.
Install / Use with Claude Desktop, Claude Code, and other MCP clients
Add this to your client's MCP server configuration (for Claude Desktop, claude_desktop_config.json;
for Claude Code, .mcp.json or claude mcp add):
{
"mcpServers": {
"free-proxy": {
"command": "npx",
"args": ["-y", "@litportnet/free-proxy-mcp"]
}
}
}
No installation step is required beyond having Node.js 20+ available; npx fetches and runs the
package on demand. To install it explicitly instead:
npm install -g @litportnet/free-proxy-mcp
All three tools are read-only and share the same underlying filters. country is a two-letter ISO
3166-1 alpha-2 code (case-insensitive). checkedWithinMin limits results to proxies checked within
the last 1-1440 minutes.
| Tool | Description | Inputs |
|---|
list_proxies | List verified free proxies matching filters. | protocol (http|socks4|socks5), country, anonymity (transparent|anonymous|elite|unknown), https (boolean), maxLatencyMs (int ≥ 0), minUptime7d (int 0-100), minChecks7d (int ≥ 0), checkedWithinMin (int 1-1440, default 30), limit (int 1-50, default 10) |
pick_best_proxies | Return the highest-ranked proxies matching filters. | count (int 1-25, default 5), plus the same filters as list_proxies except limit |
proxy_snapshot_stats | Summarize the current proxy snapshot. | checkedWithinMin (int 1-1440, default 30), protocol, country |
list_proxies and pick_best_proxies return a count and a proxies array of normalized records
exactly as returned by the SDK. proxy_snapshot_stats returns the total matching count, counts by
protocol and anonymity, the top 10 countries by count, the share of matching proxies that support
HTTPS, latency min/median/p90/max across records that report latency, how many records have a known
seven-day uptime, and the newest and oldest lastChecked timestamps. Every response includes a
disclaimer field. Errors from the underlying SDK (invalid filters, request timeouts, malformed or
stale snapshots) are returned as { isError: true, content: [...] } rather than thrown, and never
include a stack trace.
Environment
| Variable | Default | Purpose |
|---|
LITPORT_FREE_PROXY_API_URL | the SDK's built-in snapshot URL | Absolute http:// or https:// URL for the snapshot endpoint. The server validates this and exits with a clear error on startup if it is set to something else. |
LITPORT_FREE_PROXY_TIMEOUT_MS | 10000 | Per-request timeout in milliseconds passed to the SDK client. |
Test
npm test runs node --test over test/*.test.mjs: in-process unit tests that drive the server
through the MCP SDK's in-memory transport with an injected @litportnet/free-proxy-sdk client, and
an end-to-end test that spawns the server over stdio against a local HTTP fixture server, plus a
regression test that launches the server through a bin symlink the way npx does.
Resources
Free proxies are for testing only. Never route credentials, cookies, payment data, or private data through them.