PromptFax
Send a one-off fax from inside ChatGPT or Claude. Pay-per-use, $2-$4.50 per delivered fax.
Connect it
Settings → Connectors → Add custom connector
URL: https://promptfax.app/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://promptfax.app/mcp{
"mcpServers": {
"promptfax": {
"url": "https://promptfax.app/mcp"
}
}
}claude mcp add --transport http promptfax https://promptfax.app/mcp{
"servers": {
"promptfax": {
"type": "http",
"url": "https://promptfax.app/mcp"
}
}
}8 tools, verified live
start_sessionUse 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 set hostType to identify their host: chatgpt, claude, browser, or other. In ChatGPT, pass official files[] file parameters first when they are available so Prom
attach_documentFallback/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 calling this tool unless the widget is unavailable or the user explicitly asks for fallback behavior.
get_quoteFallback/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 any real fax transmission. In ChatGPT widget sessions, do not call this after start_session because the widget auto-quotes once the document and destination ar
checkoutFallback/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, as payment truth. In ChatGPT widget sessions, do not call this after start_session because the widget's Pay & send step opens Checkout.
send_faxcan modifyFallback/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 fallback behavior.
get_statusread-onlyUse this when you need the latest PromptFax workflow state, quote/payment state, or fax transmission status.
retry_failed_faxUse this after a retry-eligible failed fax to queue another attempt under the existing authorization. You may supply a corrected destination.
cancelcan modifyUse this when you need to cancel the active PromptFax send.
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