Phaxio

phaxio.com · checked 4 Oct 2026

#17 · eFax Software #19 · Fax APIs

Visit phaxio.com ↗ Alternatives Phaxio vs FaxBetter

How it plugs in

—Public API

NoOpen source

TrialFree tier

Signal on eFax Software5.4#17 of 24

Phaxio provides an API for sending and receiving faxes through software applications.

Pricing

Caller NamePer Fax Rec'd · Sender information$0.01 one-time
US & Canada faxingPer Page · US & Canada · volume pricing shown for 50,000+ and 100,000+ pages per month$0.07 one-time
International faxingPer Page · International destinations · volume pricing shown for 50,000+ and 100,000+ pages per month$0.10 one-time
Phone numberPer Month · US & Canada only (for now)$2/mo

As phaxio.com lists them, checked 4 Oct 2026.

Near it

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Runs on

Web
Windows
Mac
Linux
iOS
Android

Facts

Website: phaxio.com
Price: From $2/mo
Free trial: Yes
API formats: The maker lists client libraries or examples for cURL, PHP, Node, Ruby, Java, Python, and .NET.
API limit: The FAQ says accounts can make one API request per second and asks higher-volume users to contact support.
Callback retries: If a callback URL is unreachable, Phaxio says it retries at increasing intervals through every six hours for three days, and callbacks can also be triggered manually from the web console.
Company: The About page identifies Phaxio as built by Sinch and says it transmits over 26 million pages per month with 160 thousand active phone numbers.
Dashboard: Phaxio's dashboard lets users manage faxes and provision phone numbers.
Document formats: The FAQ lists DOCX, PDF, TIFF, JPG, TXT, HTML, and PNG as supported file types.
Fax reliability: Features include batching and collision avoidance, cancel timeouts, no throttling, smart routing, and configurable retries.
HIPAA guidance: The maker says HIPAA compliance requires steps including disabling document storage, enabling two-factor authentication, using HTTPS webhooks, and requesting a BAA.
Integrations: Barcode data can be posted to an application, and outgoing faxes can include metadata such as order numbers, user IDs, or patient record numbers.
Support: The FAQ directs users with questions to [email protected].
Transport security: Phaxio states that its API enforces TLS 1.2.
Trial access: Phaxio offers a free API test key for staging with unlimited API calls.

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