HTTP MCP server at https://app.ohfax.com/mcp.
claude mcp add --transport http agent-fax https://app.ohfax.com/mcp
Optional: after Google sign-in, Account also shows the live MCP URL and install command. MCP payment itself still needs no account.
quote_fax — Price a fax before committing. Validates destination and document, returns exact total and a payment link. Free; sends nothing. Always call before send_fax. Inputs: to, and either document_url or document_base64.send_fax — Returns authorization instructions for a previously quoted fax. This tool itself does not charge; paying the returned link transmits the document. Input: quote_id from quote_fax.get_fax_status — Poll delivery state for a fax id.get_fax_receipt — Fetch the delivery receipt once the fax is final.
Agents do not need an Account or API key. After quote_fax, pay by POSTing to
/pay?quote_id=… — unpaid requests get HTTP 402 (Machine Payments Protocol).
Discovery: GET /openapi.json. Binding amount is always the 402 challenge (not the OpenAPI floor).
Developers who prefer a prepaid balance use Account + REST/CLI instead.
Agents pay via MPP — no account, no setup.