PromptFax
Send a delivered fax from Claude or ChatGPT without standing up your own fax stack or carrier contract.
Overview
PromptFax is a MCP server for the Operate phase that sends pay-per-use delivered faxes from Claude or ChatGPT over a hosted streamable-http endpoint.
What is this MCP server?
- Streamable HTTP remote MCP at promptfax.app—no local fax hardware
- Pay-per-use pricing: $2–$4.50 per successfully delivered fax
- Works from ChatGPT and Claude via standard MCP remotes
- One-off sends—no monthly minimum or fax server to maintain
- Version 0.1.0 in the official MCP server schema
What problem does it solve?
Legacy partners and regulators still demand fax proof, but wiring carriers and monitoring delivery from an AI workflow is overhead most solo builders avoid until something urgent stalls.
Who is it for?
Indie operators who need occasional compliant fax sends from AI assistants during contracts, claims, or vendor onboarding.
Skip if: Teams needing bulk fax blasts, white-label fax APIs inside their product, or guaranteed HIPAA BAA without verifying vendor terms themselves.
What do I get? / Deliverables
Your agent can submit a one-off fax from conversation and you pay only on delivery, without running fax infrastructure.
- Delivered fax transmission initiated from the agent session
- Per-send billing in the $2–$4.50 delivered range per vendor pricing
Recommended MCP Servers
Journey fit
Fax is an ongoing business and compliance channel once you are running contracts, healthcare, or legacy counterparties—not a one-time build task. Iterate covers day-to-day operational sends (signed forms, POs, legal notices) where email is rejected but fax is still required.
How it compares
Pay-per-use fax MCP remote, not a document-signing or email automation skill.
Common Questions / FAQ
Who is app.promptfax/promptfax for?
Solo builders and operators who already work in ChatGPT or Claude and must send an occasional real fax with per-delivery billing instead of maintaining fax hardware or a carrier integration.
When should I use app.promptfax/promptfax?
Use it when a counterparty, insurer, or agency requires fax delivery and you want the send initiated from your agent conversation without building a fax API pipeline.
How do I add app.promptfax/promptfax to my agent?
Register the remote MCP server URL https://promptfax.app/mcp (streamable-http) in Claude Desktop, Claude Code, Cursor, or another MCP client that supports hosted remotes, then invoke fax tools from a connected session.