Sinch Fax API

Sinch Fax API is ranked #7 of 30 in SIP trunking providers on The Geeks Club. It runs on API, Web.

Sinch Fax API plans and pricing

All plans

Pay-as-you-go $0.05 once per page Flat rate per page; no hidden charges stated sinch.com · 4 Oct 2026

Compared on SIP trunking providers

Free plan: No
Inbound faxing: Yes
Outbound faxing: Yes
Delivery tracking: Yes
Webhook events: Yes
API protocol: rest

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Sinch Fax API

What it does: Sinch Fax API is a cloud-based service for securely sending and receiving faxes through an API.
Routing and retries: The service offers intelligent routing and automatic retries for failed fax transmissions.
Reliability: Sinch states that its network has 99.999% uptime and redundant infrastructure for fax processing in the U.S.
Security: Sinch says the service supports HIPAA, SOC 2, and GDPR compliance needs, and describes advanced encryption and secure transmission methods for healthcare data.
File formats: The product page lists DOC, DOCX, PDF, TIF, JPG, TXT, PNG, URL, and HTML content as supported formats.
Dashboard: The customer portal can show fax send and receive times and status, and lets users manage users, groups, roles, and permissions.
Numbers and scale: Customers can choose from millions of local or toll-free numbers or bring their own, and Sinch says its infrastructure scales for high fax volumes.
Integration: Sinch documents a Zapier integration with an inbound fax trigger and a send-a-fax action.
Integration limit: A Fax API service can have only one webhook at a time, which allows one inbound fax trigger per service in Zapier.
API and retention: The Fax REST API supports Basic or OAuth 2 authentication, webhooks for arriving or completed faxes, and—if storage is enabled—retains fax logs and media for 13 months before deletion.
Free account: The getting-started guide says Fax API use requires a free Sinch Build Dashboard account and that signup includes a free virtual number for testing.
Support: Sinch offers product contact through its sales team and developer documentation, and the API reference directs users with questions to the support portal.
Intended users: Sinch describes the API for startups and established companies, with examples spanning healthcare, legal, finance, insurance, and real estate.
Founded: 2008

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Where it ranks on The Geeks Club

Best SIP Trunking Providers in 2026#7 of 30

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Sources

sinch.com/voice/fax-api/· checked 4 Oct 2026
developers.sinch.com/docs/fax/integrations/zapier· checked 4 Oct 2026
developers.sinch.com/docs/fax/api-reference/fax· checked 4 Oct 2026
developers.sinch.com/docs/fax/getting-started· checked 4 Oct 2026