SingleFax API

singlefax.com · checked 7 Oct 2026

#24 · Fax APIs

Visit singlefax.com ↗ Alternatives SingleFax API vs OpenText Core Fax Management API

How it plugs in

YesPublic API

NoOpen source

NoFree tier

Signal on Fax APIs5.0#24 of 26

SingleFax provides a REST API and CLI for sending faxes from a backend using an API key and prepaid credits.

Pricing

Standard Plan$79/year · 300 pooled pages/month · dedicated US or Canadian line · $0.02/page overage$79/yr
Business Plan$239/year · 1,000 pooled pages/month · dedicated US or Canadian line · multi-user dashboard · REST API and webhooks$239/yr
API prepaid creditsPrepay credits in the dashboard or with the CLI; no API price is stated on the developer page. · Scoped API key · fax send/read, inbox read, and credits read scopesOn request
CustomContact us · Higher page pools · extra numbers · more seats and shared inbox · volume or invoice billingOn request

As singlefax.com lists them, checked 7 Oct 2026.

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Runs on

Web
Windows
Mac
Linux
iOS
Android

Facts

Website: singlefax.com
Price: From $79/yr
Free trial: Not stated
AI agent payment: The MCP workflow quotes the fax and opens Checkout or uses a page pool, while backend API usage requires prepaid credits.
API limits: Test keys cannot send live faxes, and the documentation says API keys should not be placed in a browser.
Company: SingleFax is operated by Monocube LLC, described as an independently owned company registered in Wyoming.
Developer tools: The maker provides an official npm CLI and copy-paste REST examples for curl, Node, Python, Go, and PHP.
File formats: The API accepts PDF, Word, Excel, PowerPoint, text, and image files, and the CLI documentation says to send the original file without converting it to PDF first.
Headquarters: The company lists its address as 30 N Gould St Ste R, Sheridan, WY 82801, USA.
HIPAA scope: The About page says PHI is not available through MCP, MPP, or the public API and directs covered entities and business associates to HIPAA Secure Mode on the website with an electronic BAA.
Integrations: The separate MCP connection supports Cursor, Claude, Codex, ChatGPT, and VS Code using OAuth.
Security: The maker's HIPAA page describes TLS 1.3 in transit, AES-256 at rest, isolated PHI storage, and automated media purge with an audit trail.
Support: The About page lists [email protected] as support and says the same mailbox handles product questions, partnerships, and abuse reports.

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