PromptFax is a remote MCP server that gives an AI agent 8 tools, among them attach_document, cancel, checkout. It answers at https://promptfax.app/mcp over streamable HTTP, and it listed its tools to an anonymous client, so no sign-in was needed for that. Our probes reached it 10 of 10 times since 4 September 2026; the last check, on 17 October 2026, succeeded.
Send a one-off fax from inside ChatGPT or Claude. Pay-per-use, $2-$4.50 per delivered fax.
Description as the publisher wrote it.
| Tool | What it does |
|---|---|
attach_document | Fallback/non-widget tool for binding a PromptFax document or one or more HTTPS PDF URLs into the current MCP session before requesting a quote. In ChatGPT widget sessions, prefer the widget's file controls after start_session instead of cal Inputs: sessionId, documentId, fileUrls |
cancel | Use this when you need to cancel the active PromptFax send. Inputs: sessionId, sendIntentId |
checkout | Fallback/non-widget tool for starting external Stripe Checkout after the user accepts a pay-per-use quote. Payment authorization is required before PromptFax can send; PromptFax treats webhook-confirmed authorization, not browser redirect, Inputs: sessionId, sendIntentId, autoSendAfterAuthorization |
get_quote | Fallback/non-widget tool for creating a user-reviewable pay-per-use fax quote when you have a fax number and either an MCP session, a PromptFax documentId, or one or more HTTPS PDF URLs. A quote is required before Stripe Checkout and before Inputs: sessionId, faxNumber, fileUrls, documentId |
get_status | Use this when you need the latest PromptFax workflow state, quote/payment state, or fax transmission status. Inputs: sessionId, sendIntentId |
retry_failed_fax | Use this after a retry-eligible failed fax to queue another attempt under the existing authorization. You may supply a corrected destination. Inputs: sessionId, sendIntentId, faxNumber |
send_fax | Fallback/non-widget tool for sending after payment is authorized and the user explicitly wants to send now. In ChatGPT widget sessions, do not call this after start_session unless the widget is unavailable or the user explicitly asks for fa Inputs: sessionId, sendIntentId |
start_session | Use this first when a user wants to send or price a fax. PromptFax is built for irregular, pay-per-use outbound faxing: every real send requires a user-reviewed quote and Stripe payment authorization before transmission. MCP clients should Inputs: sessionId, faxNumber, hostType, hostCapabilities, files, metadata |
Every block below points at https://promptfax.app/mcp. Pick your client and copy.
claude mcp add --transport http promptfax https://promptfax.app/mcp
{
"mcpServers": {
"promptfax": {
"command": "npx",
"args": ["-y", "mcp-remote", "https://promptfax.app/mcp"]
}
}
}{
"mcpServers": {
"promptfax": {
"url": "https://promptfax.app/mcp"
}
}
}{
"servers": {
"promptfax": {
"type": "http",
"url": "https://promptfax.app/mcp"
}
}
}{
"context_servers": {
"promptfax": {
"url": "https://promptfax.app/mcp"
}
}
}{
"mcpServers": {
"promptfax": {
"serverUrl": "https://promptfax.app/mcp"
}
}
}{
"mcpServers": {
"promptfax": {
"url": "https://promptfax.app/mcp"
}
}
}name: PromptFax
version: 0.0.1
schema: v1
mcpServers:
- name: PromptFax
type: streamable-http
url: https://promptfax.app/mcp{
"mcpServers": {
"promptfax": {
"httpUrl": "https://promptfax.app/mcp"
}
}
}{
"mcpServers": {
"promptfax": {
"type": "http",
"url": "https://promptfax.app/mcp"
}
}
}{
"mcpServers": {
"promptfax": {
"url": "https://promptfax.app/mcp"
}
}
}goose://extension?url=https%3A%2F%2Fpromptfax.app%2Fmcp&type=streamable_http&id=promptfax&name=PromptFax
It answered our last check on 17 October 2026 in 202 ms. Over 10 checks since 4 September 2026 it answered 10. Status here comes from Neuronto's own probes, not from the publisher.
Yes. It is published by promptfax.app and served from promptfax.app, the vendor's own domain: https://promptfax.app/mcp.
8, as returned by the server's own tools/list on 9 September 2026: attach_document, cancel, checkout, get_quote, get_status, retry_failed_fax, send_fax, start_session.
It answered our last check on 17 October 2026 in 202 ms. Over 10 checks since 4 September 2026 it answered 10.
Put the server under mcpServers in ~/.cursor/mcp.json with the URL https://promptfax.app/mcp. The exact JSON is above, with the same setup for Claude Code, Claude Desktop, VS Code, Windsurf, Zed, Gemini CLI and the rest.
It listed its tools to an anonymous client, so reading the tool list needs no key. Individual tools can still ask for credentials in their own inputs.
Publisher: app.promptfax. Endpoint host: promptfax.app. ARD identifier: urn:air:app.promptfax:mcp:promptfax.
First indexed 31 August 2026. The tools are exactly what the server returned; nothing on this page
is inferred from its name. Ranking in Neuronto search is never for sale.