SingleFax MCP Server

by singlefax Your server? Claim it

answering

SingleFax is answering right now. Last checked 15 min ago. It exposes 8 tools.

Send a fax from Claude, ChatGPT, or Cursor. Upload a PDF, pay, get delivery status.

Uptime history 16 days of history · worst day 98%

16 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

269 ms

Response time

average over 24h

OAuth sign-in

Access

streamable-http

What changed 4

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 3 September 2026. No other catalogue keeps this.

3 Sep 3 tools appeared create_checkout, list_skus, quote_fax

3 Sep a tool changed version

SingleFax missed 2 checks 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 15 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add mcp --transport http https://singlefax.com/mcp

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

{
  "mcpServers": {
    "mcp": {
      "url": "https://singlefax.com/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.mcp]
url = "https://singlefax.com/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "mcp": {
      "url": "https://singlefax.com/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "mcp": {
      "url": "https://singlefax.com/mcp"
    }
  }
}

This endpoint answered with an authorization challenge. The server is running, and it signs you in through your browser: there is no API key to paste.

Available tools 8

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

fax

create_fax_draft

Send a fax from this authenticated session. Pass to and base64 of the PDF in the same call. Do not PUT uploadUrl. Queues on credits or a page pool; otherwise returns checkoutUrl.

get_fax_status

Get fulfillment/payment status for a fax order you own

checkout

create_checkout

credits

get_credits

Read prepaid credit balance

machine

create_machine_fax

Autonomous MPP path — returns payment_required challenge when unpaid, then charges on retry with payment_authorization

quote

quote_fax

Retail send quote without charging. Pass to (E.164). Optional pages (default 10) or base64 of the PDF for a live page count.

skus

list_skus

Catalog of SingleFax SKUs with prices. MCP can check out credit_pack, inbound_30day, subscriptions, and lifetime numbers. Send a PDF with create_fax_draft. HIPAA, EIN, and IRS forms are website-only (URLs included).

upload

create_upload

Optional. Prefer create_fax_draft with base64. Pass base64 here to store the file on this authenticated call (no PUT). Without base64, returns a PUT URL for API-key clients.

Endpoints

URL	Transport	State	Latency	Checked
https://singlefax.com/mcp	streamable-http	sign-in	221 ms	15 min ago

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SingleFax — questions

Answers built from our own checks of this server.

What can SingleFax do?

It exposes 8 tools, read directly from the server on our last check. Among them: create_checkout, create_fax_draft, create_machine_fax, create_upload, get_credits, get_fax_status and 2 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 SingleFax 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 269 ms. The bar chart above shows every period we have measured.

How do I connect SingleFax?

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. You sign in through your browser once and the client keeps the session: no key to copy, and it refuses anonymous clients.

How do you sign in to SingleFax?

No API key is involved. SingleFax answers our knock with an OAuth challenge, so you authorise it once in your browser and the client keeps the session. That is also why we see no tool list: it will not describe itself to an anonymous client, and that is the server working as intended, not a fault.

How fast is SingleFax?

It answers our handshake in 269 ms on average, which is faster than 54% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.