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Telnyx SMS API
Telnyx SMS API · Chicago, Illinois, United States · founded 2009
What it is
Telnyx SMS API lets developers send and receive SMS and MMS through REST APIs. It supports two-way messaging, inbound webhooks, and sender channels including 10DLC, toll-free numbers, short codes, and alphanumeric sender IDs. SDKs are listed for Node.js, Python, Ruby, PHP, .NET, Java, and Go. The API includes delivery reports, automated queuing and encoding, and a debugging tool for deliverability analysis. Long SMS messages are automatically split into multiple messages, and replies containing stop words such as STOP unsubscribe recipients from future sends. Existing numbers can send and receive SMS and MMS through hosted SMS without changing providers. Telnyx advertises phone numbers in more than 130 countries and free 24/7 support. Usage pricing starts at $0.004 per message part, with a $0 platform fee listed; carrier fees and taxes may apply, and volume discounts follow specified monthly thresholds. There is no free plan or trial. Level 1 verified accounts are limited to 50 outbound messages per day, pretrial accounts need a full account to use Messaging, and the retrieve-message endpoint only retrieves messages no older than 10 days.
For and against
For
- Supports two-way SMS, MMS, and inbound webhooks
- SDKs cover seven programming languages
- Hosted SMS works with existing numbers
- Free 24/7 expert support is listed
Against
- No free plan or free trial
- Level 1 accounts have a 50-message daily limit
- Retrieve endpoint excludes messages older than 10 days
- Carrier fees and taxes may apply
The verdict
Telnyx offers broad messaging and developer tooling with usage-based pricing starting at $0.004 per message part. Account limits and retrieval age restrictions are worth checking against a planned workflow.
Who it suits
Telnyx SMS API is for developers building SMS or MMS messaging into applications and services. It suits teams that need REST APIs, SDKs, and multiple sender channel options.
Plans and prices
SMS API usage
Programmable SMS messaging · Inbound and outbound messaging
Read 28 Sep 2026 · telnyx.com
SMS API pay as you go
Automatic discounts above 100M messages/month · $0 platform fee
Read 2 Oct 2026 · telnyx.com
Committed
Named account manager · priority support · higher limits
Read 2 Oct 2026 · telnyx.com
Enterprise
Dedicated infrastructure and IPs · private interconnect · unlimited rate limits
Read 2 Oct 2026 · telnyx.com
Pay as you go
Read 28 Sep 2026 · telnyx.com
On the record
- Account limit
- Level 1 verified accounts are limited to 50 outbound messages per day.support.telnyx.com · read 2 Oct 2026
- AI coding tools
- Agent Skills support Claude Code, Cursor, and Windsurf integrations.telnyx.com · read 28 Sep 2026
- Automatic opt-outs
- STOP-word replies automatically unsubscribe recipients from future sends.telnyx.com · read 28 Sep 2026
- Company history
- Telnyx was founded in 2009 and is based in Austin, Texas, with offices in Denver, Dublin and Amsterdam.support.telnyx.com · read 2 Oct 2026
- Monthly message volume
- Telnyx reports more than 1.3 billion messages sent and received monthly.telnyx.com · read 28 Sep 2026
- Core function
- Telnyx SMS API lets developers send and receive SMS or MMS globally.telnyx.com · read 2 Oct 2026
- Delivery reporting
- The API includes detailed delivery reports and a debugging tool for deliverability analysis.telnyx.com · read 2 Oct 2026
- Developer APIs
- The service provides REST APIs, comprehensive documentation, and SDKs.telnyx.com · read 28 Sep 2026
- Developer support
- Telnyx provides REST APIs, documentation and SDKs for Python, JavaScript, Go, Java and Ruby.telnyx.com · read 2 Oct 2026
- Platform fee
- The pricing page lists a $0 platform fee.telnyx.com · read 28 Sep 2026
- Free support
- The pricing page lists $0 support, and the product page states 24/7 free support.telnyx.com · read 28 Sep 2026
- Free tier limits
- The page shows free signup and $0 platform fee, but does not state a message allowance.telnyx.com · read 28 Sep 2026
- Global coverage
- Telnyx advertises phone numbers in more than 130 countries.telnyx.com · read 2 Oct 2026
- Hosted SMS
- Existing numbers can send and receive SMS and MMS without changing providers.telnyx.com · read 28 Sep 2026
- Inbound webhooks
- Yestelnyx.com · read 24 Sep 2026
- Long messages
- The API automatically separates SMS messages that are too long for the destination into multiple messages.telnyx.com · read 2 Oct 2026
- Message concatenation
- Long SMS messages are automatically separated into multiple messages.telnyx.com · read 28 Sep 2026
- Message optimization
- Automated message queuing is set according to account limits and industry standards to manage throughput and compliance.telnyx.com · read 2 Oct 2026
