Send a one-off fax from inside ChatGPT or Claude. Pay-per-use, $2-$4.50 per fax, charged only after delivery. No PromptFax account, no subscription, no API key to manage.
Overview
PromptFax is a pay-per-use remote MCP server that lets an AI assistant send a real fax to a US fax number. The assistant uploads a PDF or image, enters the destination, reviews a quote, authorizes payment through Stripe, and PromptFax queues the transmission. Pricing is $2.00 for the first 5 pages, $0.10 per page after that, capped at $4.50 for up to 35 pages. Payment is captured only after the fax is recorded as delivered.
PromptFax uses OAuth and Streamable HTTP. There is no PromptFax account, no subscription, and no API key to manage.
Docs: https://promptfax.app/mcp-setup Tool catalog: https://promptfax.app/mcp-tools MCP endpoint: https://promptfax.app/mcp
Server Config
{
"mcpServers": {
"promptfax": {
"url": "https://promptfax.app/mcp",
"transport": "streamable-http"
}
}
}