Phaxio
Phaxio: A feature-rich fax API for sending, receiving, tracking, and routing documents. Ranked #2 of 26 in Fax APIs by our editors (9.2/10); pricing: Paid; best for developers needing a feature-rich fax API.
At a glance
- Editor score9.2 / 10
- PricingPaid
- Best forDevelopers needing a feature-rich fax API
- Free planNo
- Inbound faxingYes
- Facts checked20 Sep 2026
Where it wins
- Sends fax content from files, URLs, or HTML
- Supports inbound numbers, tracking, webhooks, retries, and batching
- Provides REST, JSON responses, and client libraries for multiple languages
Where it doesn't
- No free production plan
- International and volume pricing varies by destination and usage
- Requires development work rather than a standalone fax workspace
Our verdict on Phaxio
Phaxio is a cloud fax API for developers and businesses that need to send and receive faxes from software applications. Its REST API returns JSON responses and supports outbound faxing from files, URLs, or HTML content, while provisioned phone numbers support inbound faxing. Status retrieval, delivery tracking, callbacks, webhooks, and document retrieval help teams connect fax workflows to their own applications.
Pricing is pay-as-you-go, with regional per-page rates and optional monthly phone numbers. The phone-number plan is listed at $2 per month for US and Canada phone numbers. The published plans also include US and Canada faxing, international faxing, Caller Name, and volume pricing for US and Canada or international faxing at 50,000+ and 100,000+ pages. Free test API keys are available for staging, while production usage is paid.
Phaxio’s strongest fit is an application that needs operational control around fax delivery. Batching, collision avoidance, configurable retries, cancel timeouts, metadata tagging, and PhaxCode barcode routing cover workflows that go beyond basic send-only faxing. Phone-number provisioning and management, plus client libraries for multiple programming languages, support integration into varied development environments. Choose Phaxio when API coverage, inbound faxing, event callbacks, and routing matter. Teams looking for a standalone fax workspace or a free production tier should consider a different type of service.
Your product? Our editors can test Phaxio in depth and publish a review, labelled as paid · from $149/mo →
Phaxio pricing
All 8 Phaxio plans and prices →
Phaxio fact sheet
| Free plan | No |
|---|---|
| Paid from | Not verified |
| Inbound faxing | Yes |
| Outbound faxing | Yes |
| Delivery tracking | Yes |
| Webhook events | Yes |
| API protocol | Rest |
| Included pages | Not verified |
| Deployment | Cloud |
| Platforms | Web |
| Compliance & security | HIPAA, PCI DSS |
| Support | Email, Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Paid (source) |
| Website | phaxio.com |
| Facts checked | 20 Sep 2026 |
Alternatives to Phaxio
- Telnyx Fax APIA low per-page REST fax API with inbound, outbound, tracking, and webhook support.9.4
- FaxxingA practical free-start fax API with inbound support, signed webhooks, and usage-based pricing.9.1
- Sinch Fax APIA mature REST fax API for adding inbound and outbound faxing to business applications.9.0
Phaxio vs the competition
- Phaxio vs Telnyx Fax API
- Phaxio vs Faxxing
- Phaxio vs Sinch Fax API
- Phaxio vs OpenText Core Fax Management API
- Phaxio vs Documo Fax API
- Phaxio vs Openfax Cloud Fax API
Compare Phaxio with any tool side by side →
Also Ranked In
Phaxio is ranked in 2 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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