SingleFax API
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Business Plan | $239/year · 1,000 pooled pages/month · dedicated US or Canadian line · multi-user dashboard · REST API and webhooks | $239 a year |
| Standard Plan | $79/year · 300 pooled pages/month · dedicated US or Canadian line · $0.02/page overage | $79 a year |
| API prepaid credits | Prepay 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 scopes | On request |
| Custom | Contact us · Higher page pools · extra numbers · more seats and shared inbox · volume or invoice billing | On request |
As singlefax.com lists them, read 7 Oct 2026. The maker's own page has the final word.
Facts from SingleFax API's own pages
- AI agent payment
- The MCP workflow quotes the fax and opens Checkout or uses a page pool, while backend API usage requires prepaid credits. · singlefax.com, 7 Oct 2026
- API access
- The REST API uses Bearer authentication, scoped API keys, and a required Idempotency-Key when creating a fax. · singlefax.com, 7 Oct 2026
- API limits
- Test keys cannot send live faxes, and the documentation says API keys should not be placed in a browser. · singlefax.com, 7 Oct 2026
- Company
- SingleFax is operated by Monocube LLC, described as an independently owned company registered in Wyoming. · singlefax.com, 7 Oct 2026
- Developer tools
- The maker provides an official npm CLI and copy-paste REST examples for curl, Node, Python, Go, and PHP. · singlefax.com, 7 Oct 2026
- 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. · singlefax.com, 7 Oct 2026
- Headquarters
- The company lists its address as 30 N Gould St Ste R, Sheridan, WY 82801, USA. · singlefax.com, 7 Oct 2026
- 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. · singlefax.com, 7 Oct 2026
- Integrations
- The separate MCP connection supports Cursor, Claude, Codex, ChatGPT, and VS Code using OAuth. · singlefax.com, 7 Oct 2026
- Product
- SingleFax provides a REST API and CLI for sending faxes from a backend using an API key and prepaid credits. · singlefax.com, 7 Oct 2026
- 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. · singlefax.com, 7 Oct 2026
- Support
- The About page lists [email protected] as support and says the same mailbox handles product questions, partnerships, and abuse reports. · singlefax.com, 7 Oct 2026
Where SingleFax API stands on Freedom251
- Fax APIs#23 of 26