How it plugs in
—Public API
NoOpen source
NoFree tier
Signal on Fax APIs5.2#22 of 26
The cloud-based Fax API automates outbound faxing from applications, web forms, custom software, and web services.

Pricing
- OmniStarting at $8.95/mo; API fax sending has usage charges. · 300 inbound minutes/month · fax sending via API; usage charges apply$8.95/mo
- Toll-FreeStarting at $8.95*/mo; minimum monthly spend; overages apply. · U.S./Canada toll-free number · fax sending via API; usage charges apply$8.95/mo
- Jump StartStarting at $19.95/mo; base fee plus at least one number fee. · Up to 2 numbers · API fax sending; usage charges apply beyond allowances · 150 monthly minutes under Simple Usage$19.95/mo
- Standard CorporateStarting at $53.90/mo; base fee plus at least one number fee. · API fax sending · 400 monthly minutes under Simple Usage · overages as low as $0.03/min$53.90/mo
As innoport.com lists them, checked 8 Oct 2026.
Near it
All alternatives →- CF
Concord Fax API#21 on this board - OCOpenText Core Fax Management API#23 on this board
- SFSend FAX Mail API#20 on this board
- SASingleFax API#24 on this board
- P
Phaxio#19 on this board - SMSendFax.me Developer API#25 on this board
- LALuzardoFax API#18 on this board
- TFTelnyx Fax API#26 on this board
- FAFax² API#17 on this board
- DFDocumo Fax API#16 on this board