Transactional SMS API
Send reliable, automated message with Prelude : Connect your application to the Prelude Transactional SMS API, the simplest and most powerful solution for sending automated messages, OTPs, and customer notifications in real time.
Best Alternative
What is a transactional SMS ?
A transactional SMS is an automated text message sent to a user after a specific action, such as signing up, completing a payment, confirming an order, or securely logging in.
Unlike marketing SMS messages that promote products or services, transactional SMS texts are informative, real-time, and service-oriented.
Order or delivery confirmation
now
Choose
Your order is confirmed! We’ll let you know as soon as it’s on its way.
Verification codes (OTP / MFA)
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BeReal
5678 is your verification code for BeReal, your friend for real !
Payment notification or security alert
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ShareSub
Your monthly payement for Spotify has been updated in your app.
Appointment reminder or availability alert
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Getaround
Good news ! A car matching your alert is now available in your area.
Transactional SMS ensures instant, direct, and reliable communication with open rates exceeding 95 %.
Why use a transactional SMS API ?
It allows you to automate message delivery through secure integration with your internal systems (CRM, ERP, e-commerce, or mobile app).
Speed
Instant message delivery (average under 3 seconds).
Reliability
Delivery rate above 98 %.
Security
Secure integration and compliant infrastructure
01110101110101011101
0111001010
Personalization
Dynamic fields (name, language, time zone).
Your ticket is ready! Find it in the app before the event.
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Shotgun
Tracking
Delivery receipts (DLRs), analytics, and detailed API logs.
Momentum
With Prelude’s API, you can enhance customer experience and engagement while reinforcing your brand’s trust and responsiveness.
Easy to set up
How does the Prelude transactional SMS API work?
Prelude’s REST API is designed for fast integration and reliable delivery of all your transactional messages.
In just a few HTTP requests, you can send, monitor, and analyze your SMS traffic.
curl https://api.prelude.dev/v2/notify \ -H 'Authorization: Bearer <TOKEN>' \ -H 'Content-Type: application/json' \ -d '{"template_id":"template_01k8ap1btqf5r9fq2c8ax5fhc9","to":"+33612345678","variables":{"foo":"bar"}}'
Example API Call
Expertise
Core features
API Dispatch
Single or bulk message sending via POST requests.
Instant Oversight
Real-time DLRs, message status tracking, and live cost monitoring.
Adaptive Routing
Smart routing by region and carrier.
Automated Handling
Automatic language and encoding management.
Technical Resources
Clear documentation, code samples, and sandbox testing.
Prelude simplifies transactional messaging with a stable, fully documented, and secure SMS API, compliant with both GDPR and U.S. data-protection standards.
Use Cases
Real-World Use Cases
Transactional SMS fits seamlessly into every user journey, from authentication and confirmation to alerts and retention.
Industry
Best Option
Why choose Prelude for your transactional SMS?
Prelude gives you the reliability of an international SMS provider with the responsiveness of a local team.
Guaranteed performance: 98 %+ delivery rate through direct carrier connections.
Responsive human support with fast response available via Slack
Transparent, usage-based pricing with no commitments.
Secure infrastructure: Hosted in certified data centers with 99.95 % SLA.
Clear, Predictable Pricing
Pay-as-you-go
Based on country and message volume.
No setup fees
or minimum commitment.
Real-time billing dashboard
with usage and cost tracking.
Clear, transparent global pricing by country.
A fully predictable pricing model, perfect for growing businesses and SaaS platforms.
Security, Compliance, and Reliability
Prelude follows strict security and compliance standards to protect your data and messages.
Your transactional SMS traffic is secure, fast, and compliant. Every message, every time.
Encrypted HTTPS/TLS communication.
Token-based API authentication.
Secure hosting in U.S. and EU data centers.
99.95 % uptime SLA.
Continuous monitoring and fraud detection.
FAQ
Everything you need to know about Prelude, the best Twilio Verify alternative.
What is a transactional SMS?
A Transactional SMS is an automatic message sent after a specific user action — such as an order confirmation, OTP code, payment notification, or appointment reminder.
Unlike marketing SMS, its goal is informational and service-related, not promotional.
What are the advantages of Prelude’s Transactional SMS API?
Prelude provides fast delivery, easy integration, and a 98 %+ delivery rate.
You get delivery receipts (DLRs), real-time status updates, and comprehensive developer documentation.
It automates your communication flows while ensuring security, transparency, and compliance with global standards.
How do I integrate the Transactional SMS API?
Integration is quick and simple using standard REST / JSON requests.
Prelude provides:
Complete technical documentation and code examples.
Dashboard test numbers and free credits for real message testing.
What are the costs of using the API?
Pricing depends on the destination country and sending volume.
Prelude’s model is transparent — no hidden fees or subscriptions.
You pay only for what you send.
Can I send transactional SMS internationally?
Yes. Prelude supports delivery to over 230 countries, with intelligent routing that optimizes performance for each carrier.
Perfect for businesses with global customers and distributed operations.
How does Prelude ensure compliance and data protection?
Prelude’s infrastructure complies with GDPR and U.S. privacy standards.
All communications are encrypted via HTTPS/TLS, and API requests are authenticated with secure tokens.
Only essential data is stored for delivery tracking, and everything is processed on secure, audited servers.
What kind of analytics and reports are available?
Prelude provides a full suite of metrics, including:
Delivery rate and latency.
Real-time message status.
These insights help you optimize your delivery strategy and improve user experience.
Does Prelude offer technical support?
Yes. Prelude provides responsive, human support via chat, email and dedicated slack channel.
Our engineering team helps with:
API integration and key setup.
Deliverability optimization.
Webhook and DLR configuration.
Advanced troubleshooting.
A hands-on support experience for an automated messaging solution.
Get Started with Prelude’s Transactional SMS API
Automate your messages, improve your customer communication, and boost efficiency starting today.