Phaxio
Phaxio is a developer-focused cloud fax API platform, now an indirect Sinch subsidiary, that enables software applications to programmatically send and receive faxes across 50+ countries. It serves 3,000+ customers in healthcare, restaurant tech, and logistics via a self-serve, pay-per-page pricing model.
- Company typePrivate
- Founded2011
- HeadquartersNorthbrook, United States
- Headcount1–10
- GTM typeB2B
- OfferingSoftware
What Phaxio does
Phaxio is a cloud-based fax API platform that enables software developers to programmatically send and receive faxes via a REST interface, abstracting the complexity of traditional T.38/telecom infrastructure. Founded in 2011 by Howard Avner and Josh Nankin, the company was acquired by Voyant Communications in August 2018 and is now an indirect subsidiary of Sinch, the publicly traded Swedish CPaaS provider. The core product is a JSON REST API supporting fax transmission and receipt across multiple file formats (PDF, DOCX, TIF, JPG, PNG, TXT, HTML) with proprietary features including batching and collision avoidance, smart carrier routing with intelligent retries, cancel timeouts, PhaxCode barcode-based routing, and metadata tagging for audit trails.
The platform serves over 3,000 customers spanning restaurant ordering networks, healthcare providers requiring HIPAA-compliant transmission, logistics firms, automotive service chains, financial services, and developer-tool startups. It transmits approximately 26 million pages per month across 160,000 active phone numbers and supports 50+ countries. The company offers HIPAA, PCI DSS compliance, and inherits SOC 2 Type II and ISO 27001 certifications through its AWS hosting infrastructure.
Phaxio operates a fully self-serve, product-led growth model with no sales team required for transactions. Revenue is generated through usage-based pricing at 7 cents per page for US/Canada and 10 cents per page for international destinations, with volume discounts down to 4 cents per page at 100,000+ monthly pages, supplemented by $2/month phone number rental subscriptions and 1 cent per received fax for Caller Name. The company has 1-10 employees and is headquartered in Boulder, Colorado, legally domiciled in Illinois under its parent entity Voyant Communications, LLC.
Phaxio firmographics
Firmographics- Name
- Phaxio
- Legal name
- Voyant Communications, LLC
- Website
- https://phaxio.com
- Company type
- Private
- Founded year
- 2011
- Operating status
- Operating
- Headcount range
- 1–10 employees
- Short description
- Phaxio is a developer-focused cloud fax API platform, now an indirect Sinch subsidiary, that enables software applications to programmatically send and receive faxes across 50+ countries. It serves 3,000+ customers in healthcare, restaurant tech, and logistics via a self-serve, pay-per-page pricing model.
- Ownership category
- akta.pro rank
Where Phaxio is headquartered
LocationHeadquarters
- HQ city
- Northbrook
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
Phaxio business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Infrastructure, Technology or R&D, Personnel, Operations, Marketing or Sales
Revenue model
- Per-page fax transmission: Usage-based pricing charged per page sent or received. Standard rate of 7 cents per page for US & Canada, 10 cents for international destinations. Volume discounts available for high-volume senders: 5 cents at 50,000+ pages/month, 4 cents at 100,000+ pages/month.
- Phone number rental: Monthly subscription at $2 per phone number for receiving faxes. Available for US & Canada numbers. Numbers can be purchased, ported in, or used via general Phaxio number with PhaxCode routing.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Usage-based | Pay-as-you-go | US & Canada Fax - 7¢ per page |
| Usage-based | Pay-as-you-go | International Fax - 10¢ per page |
| Subscription | Monthly | Phone Numbers - $2 per month |
Go-to-market motion1 record
Distribution channels2 records
Marketing channels5 records
Phaxio product offering
Product offeringCore offering
Phaxio provides a cloud-based REST API that enables developers to send and receive faxes programmatically from within their applications. The platform supports file formats including PDF, DOCX, TIF, JPG, PNG, TXT, and HTML, with webhook callbacks for delivery status notifications. Additional offerings include phone number provisioning, official SDKs in multiple programming languages, and HIPAA-compliant configurations for healthcare customers.
Product overview
Phaxio is a cloud-based fax API platform designed for developers. The core offering is the Fax API, which enables programmatic sending and receiving of faxes through REST API calls. Supporting products include official SDKs in six programming languages (PHP, Node.js, Python, .NET, Ruby, Java), phone number provisioning for receiving faxes, PhaxCodes for barcode-based document routing, and HIPAA compliance tools for healthcare customers. The platform operates on a pay-per-page model starting at 7 cents per page with volume discounts available.
Differentiator
Problem solved
Functional benefit
Products and services
- Phaxio Fax API A developer-focused REST API platform for sending and receiving faxes programmatically. Supports sending faxes via file upload, HTML, URL, or text string, with webhook callbacks for delivery status notifications. Supports PDF, DOCX, TIF, JPG, PNG, TXT, and HTML file formats, and is used by software developers building applications that require fax functionality, from startups to Fortune 500 enterprises.
- Client Libraries (SDKs) Official SDKs in multiple programming languages including PHP, Node.js, Python, .NET, Ruby, and Java, published on GitHub with package manager installation support. These client libraries enable developers to integrate the Phaxio API into their applications with native language idioms.
- Phone Number Provisioning Subscription service that allows customers to purchase and manage dedicated phone numbers for receiving faxes, available in US and Canada at $2 per month. Numbers can be newly purchased, ported in for free, or used via a general Phaxio number with PhaxCode routing for distribution. Used by businesses that need to receive faxes as part of their document workflows.
Companies that use Phaxio
Customer profileNamed customers9 records
Segments4 records
Ideal customer profiles4 records
Phaxio technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Integration2 records
Feature7 records
Phaxio partnerships and signals
Strategic signalPartnerships
One partnership is on record.
- Sinch/Voyant CommunicationscorePhaxio joined Voyant Communications, LLC (a Sinch company) in August 2018. Voyant is a leading provider of business communication services for businesses and developers, offering both communication applications including fax to businesses and communication APIs. Sinch's cloud-based offerings serve enterprises of all sizes and support fax, voice, messaging, and video.
Scale indicators4 records
Recent moves6 records
Expansion highlights5 records
Phaxio competitors and assessment
Company assessmentDirect peers
- HelloFax: HelloFax (part of Dropbox) offers online cloud fax with developer integrations. Comparable to Phaxio in cloud fax delivery, though more SMB/web-focused than pure API.
- Documo (formerly FAXAGE): Documo provides a developer-focused cloud fax API with similar capabilities (programmatic send/receive, HIPAA support, API integrations). Closely comparable to Phaxio in product scope and developer-first positioning.
- Twilio: Twilio's Programmable Fax API directly competes with Phaxio, offering developers programmatic send/receive fax over the same REST API model, with similar SDK coverage and usage-based pricing. Most directly comparable peer in the CPaaS fax API space.
- InterFAX: InterFAX provides an internet-based fax API targeted at developers and integrators, with usage-based pricing. Closely comparable to Phaxio's API-first developer offering and pricing model.
- Consensus eFax: eFax by Consensus is one of the largest cloud fax services globally, offering both consumer/enterprise fax and developer APIs. Comparable to Phaxio's core send/receive fax service across overlapping customer segments.
- Biscom: Biscom offers enterprise secure fax solutions including cloud fax APIs, with strong healthcare and regulated-industry focus. Directly comparable to Phaxio for HIPAA-compliant fax transmission and document workflows.
- MetroFax: MetroFax provides cloud-based fax services with API access for SMBs and enterprises. Comparable to Phaxio in fax transmission capabilities and developer-accessible delivery model.
Broad incumbents
- Vonage (Ericsson): Vonage Communications APIs (now part of Ericsson) provide messaging, voice, and fax APIs for developers and enterprises. Comparable to Phaxio as a CPaaS provider with overlapping fax API capabilities within a broader communications portfolio.
- RingCentral: RingCentral offers cloud fax as part of its broader unified communications and contact center portfolio. Comparable to Phaxio in fax capability but bundled into a much larger business communications suite targeting enterprises.
- Sinch: Sinch is Phaxio's publicly traded parent company and operates a broader CPaaS portfolio (messaging, voice, video, verification, email) that competes across all communication modalities. Comparable as the strategic acquirer and primary infrastructure provider for Phaxio.
Market position
Strengths4 records
Weaknesses4 records
Competitive moat6 records
Key risks5 records
Key highlights6 records
Customer concentration
Phaxio social profiles
Digital presencePhaxio compliance and trust
Trust signalCompliance4 records
Phaxio financial estimates
Financial estimateRevenue estimate
Valuation estimate
Phaxio leadership team
Management profileNumber of profiles
Profiles3 records
Phaxio funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Phaxio M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Phaxio
What does Phaxio do?
Phaxio provides a cloud-based REST API that enables developers to send and receive faxes programmatically from within their applications. The platform supports file formats including PDF, DOCX, TIF, JPG, PNG, TXT, and HTML, with webhook callbacks for delivery status notifications. Additional offerings include phone number provisioning, official SDKs in multiple programming languages, and HIPAA-compliant configurations for healthcare customers.
Is Phaxio a public or private company?
Phaxio is a private company. It is classified as corporate owned and is currently operating.
When was Phaxio founded?
Phaxio was founded in 2011. It employs 1 to 10 people.
Where is Phaxio based?
Phaxio is headquartered in Northbrook, United States, in the North America region.
How does Phaxio make money?
Two revenue lines are on record. Per-page fax transmission is the primary driver. The others are phone number rental.
Who are Phaxio's main competitors?
Direct peers on record are HelloFax, Documo (formerly FAXAGE), Twilio, InterFAX, Consensus eFax, Biscom and MetroFax. Broad incumbents are Vonage (Ericsson), RingCentral and Sinch.
Does Phaxio have an API?
Yes. Phaxio provides a REST API for sending and receiving faxes programmatically. The API supports multiple versions (v1, v2, v2.1) and offers features including sending faxes via file upload or HTML/string data, receiving faxes with webhook callbacks, batching and collision avoidance, phone number provisioning, barcode (PhaxCode) creation and reading, number porting, and account management. Authentication uses API key and secret. Rate limit is 1 request per second. Developer documentation is at www.phaxio.com/docs.