Telnyx Fax API
Telnyx Fax API: A low per-page REST fax API with inbound, outbound, tracking, and webhook support. Ranked #1 of 26 in Fax APIs by our editors (9.4/10); pricing: Paid; best for high-volume developers needing low per-page pricing.
At a glance
- Editor score9.4 / 10
- PricingPaid
- Best forHigh-volume developers needing low per-page pricing
- Free planNo
- Paid from$500/mo
- Inbound faxingYes
- Founded2009 · Austin, Texas, United States
- Facts checked20 Sep 2026
Where it wins
- $0.007-per-page starting rate with automatic tier discounts
- REST support for sending, receiving, status events, and number provisioning
- T.38, G.711, resolution controls, and automatic error correction
Where it doesn't
- No free plan; usage requires a paid account
- SIP Trunking transmission usage is charged separately
- API-only access may not suit teams seeking a standalone fax interface
Our verdict on Telnyx Fax API
Telnyx Fax API is a programmable service for organizations that need to send, receive, and manage faxes through software rather than traditional fax infrastructure. It is suited to developers building fax workflows for healthcare, finance, legal, and other compliance-sensitive operations. The API supports both outbound and inbound faxing, fax-capable number provisioning and porting, inbound forwarding to email, delivery and failure status events, and webhook notifications. Its starting rate is $0.007 per page, with usage billed by page and no monthly fee on the Pay as you go plan.
Pricing is structured around three plans. Pay as you go has no monthly minimum and includes standard per-page rates, card-on-file billing, and automatic tier discounts as usage crosses thresholds. Committed costs $500 per month and adds discounted rates across usage, a named account manager, priority support, and higher limits. Enterprise costs $5,000 per month and includes custom pricing, dedicated infrastructure and IPs, private interconnect, and unlimited rate limits. Fax usage is billed per page, while SIP Trunking transmission usage is charged separately; rates may vary by destination and volume tier.
The standout capability is control over fax delivery inside an application. Developers can choose normal, high, or very high resolution and use T.38 or G.711 pass-through support, while delivery, failure, and other fax webhook events provide status visibility. Automatic error correction is also included. Telnyx Fax API is a strong fit for high-volume teams that want low per-page pricing and programmable inbound and outbound workflows. Teams needing a free plan, a non-API fax interface, or a single bundled price that includes SIP Trunking should consider a different approach.
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Telnyx Fax API pricing
All 3 Telnyx Fax API plans and prices →
Telnyx Fax API fact sheet
| Free plan | No |
|---|---|
| Paid from | $500/mo |
| Inbound faxing | Yes |
| Outbound faxing | Yes |
| Delivery tracking | Yes |
| Webhook events | Yes |
| API protocol | Rest |
| Included pages | Not verified |
| Deployment | Cloud |
| Compliance & security | SOC 2, ISO 27001, GDPR, PCI DSS, HIPAA |
| Support | Email, Live chat, Phone, Tickets, Docs · 24/7 |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Paid (source) |
| Website | telnyx.com |
| Facts checked | 20 Sep 2026 |
Alternatives to Telnyx Fax API
- PhaxioA feature-rich fax API for sending, receiving, tracking, and routing documents.9.2
- 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
See all Telnyx Fax API alternatives →
Telnyx Fax API vs the competition
- Telnyx Fax API vs Phaxio
- Telnyx Fax API vs Faxxing
- Telnyx Fax API vs Sinch Fax API
- Telnyx Fax API vs OpenText Core Fax Management API
- Telnyx Fax API vs Documo Fax API
- Telnyx Fax API vs Openfax Cloud Fax API
Compare Telnyx Fax API with any tool side by side →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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