Sinch Fax API

What Sinch Fax API is

Sinch Fax API is a cloud-based service for sending and receiving faxes through an API. The REST API supports inbound and outbound faxing, delivery tracking, and webhook events for arriving or completed faxes. It accepts Basic or OAuth 2 authentication. If storage is enabled, fax logs and media are retained for 13 months before deletion. Listed formats include DOC, DOCX, PDF, TIF, JPG, TXT, PNG, URL, and HTML. A customer portal shows fax send and receive times and status, and lets users manage users, groups, roles, and permissions. Customers can select local or toll-free numbers, or bring their own. Sinch describes intelligent routing and automatic retries for failed transmissions, and says its U.S. fax-processing network has 99.999% uptime and redundant infrastructure. It says the service supports HIPAA, SOC 2, and GDPR compliance needs, with encryption and secure transmission methods for healthcare data. A free Sinch Build Dashboard account is required to use the API; signup includes a free virtual number for testing. Pay-as-you-go costs $0.05 per page, while pricing is also available on request. A Fax API service can have one webhook at a time, allowing one inbound fax trigger per service in Zapier.

Who it suits

It suits startups and established companies that need to send or receive faxes through an API, including teams in healthcare, legal, finance, insurance, or real estate. Developers can use the REST API, webhooks, and listed Zapier integration.

Limits

The listed Pay-as-you-go rate is $0.05 per page. A Fax API service supports one webhook at a time, allowing one inbound fax trigger per service in Zapier; the listed concurrent call limit is 10 calls.

Getting started

1. Create a free Sinch Build Dashboard account.
2. Use the free virtual number included with signup for testing.
3. Choose a local or toll-free number, or bring an existing number.
4. Connect through the REST API using Basic or OAuth 2 authentication.
5. Use the developer documentation and an SDK for Node.js, Java, .NET, or Python.
6. For Zapier, configure the send-a-fax action or inbound fax trigger.

Verdict

Sinch Fax API provides fax transmission and management through a REST API, with a portal and listed file formats. Note the single-webhook limit and the per-page rate when assessing fit.