FaxOnline MCP Server

by abrudtkuhl Your server? Claim it

answering

FaxOnline is answering right now. Last checked 2 min ago. It exposes 2 tools.

Prepare and track US PDF faxes with user-approved checkout. No account or subscription.

Uptime history 63 hours of history · worst hour 75%

63 hours agonow

100.0%

Uptime 24h

92 of 92 checks

Tools

read from the server

728 ms

Response time

average over 24h

open, no key

Access

streamable-http

FaxOnline 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 2 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add faxonline --transport http https://faxonline.app/mcp/fax

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "faxonline": {
      "url": "https://faxonline.app/mcp/fax"
    }
  }
}

~/.codex/config.toml

[mcp_servers.faxonline]
url = "https://faxonline.app/mcp/fax"

.cursor/mcp.json

{
  "mcpServers": {
    "faxonline": {
      "url": "https://faxonline.app/mcp/fax"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "faxonline": {
      "url": "https://faxonline.app/mcp/fax"
    }
  }
}

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.

fax

get_fax_status

Check your prepared fax using its secret draft_token. Returns payment and delivery status. A processing fax has not yet been delivered. Poll no more than once every 15 seconds.

prepare

prepare_fax

Prepare one PDF fax and return its price and Stripe checkout link. This stores the document but does not send or charge. Completing checkout authorizes sending to the displayed recipient. Keep draft_token private and reuse it with identical inputs for retries.

Endpoints

URL	Transport	State	Latency	Checked
https://faxonline.app/mcp/fax	streamable-http	answering	1103 ms	2 min ago

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FaxOnline — questions

Answers built from our own checks of this server.

What can FaxOnline do?

It exposes 2 tools, read directly from the server on our last check. Among them: get_fax_status, prepare_fax. 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 FaxOnline working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 728 ms. The bar chart above shows every period we have measured.

How do I connect FaxOnline?

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 FaxOnline need an API key?

No. FaxOnline 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 FaxOnline?

It answers our handshake in 728 ms on average, which is faster than 13% 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.