Prelude: The Modern SMS API Built for OTP, 2FA, and Global Verification
Prelude is a next-generation OTP provider and SMS gateway built for companies that require fast, consistent, and fraud-resistant OTP delivery worldwide.
Unlike traditional SMS gateways, Prelude offers real-time routing intelligence, transparent diagnostics, and built-in fraud protection, making it ideal for 2FA, login verification, and phone number verification at scale.
Engineered for product, growth, and engineering teams, Prelude combines a developer-first OTP API, carrier-quality routing, and advanced analytics to ensure your users receive verification codes instantly and reliably in every country.
Why Prelude Outperforms Traditional SMS Gateways
1. Smart multi-routing for OTP and transactional SMS
While legacy gateways rely on static routes, Prelude continuously evaluates carrier performance and selects the fastest, most stable route for every message. This significantly improves SMS OTP delivery speed, reduces failures, and boosts conversion during signup and login flows.
2. Fraud detection and SMS pumping prevention
Prelude includes advanced protection against SMS pumping, bot-driven signups, abnormal messaging patterns, and high-risk geographies. Companies cut spending dramatically while keeping genuine users authenticated without friction.
3. Developer-first OTP & responsive support
The Prelude SMS gateway API and OTP verification API integrate in minutes. With clean endpoints, structured error codes, and clear delivery logs, teams gain full visibility into authentication performance across markets. We offer Slack support for responsive support.
Supported use cases:
-OTP codes for account creation
-Two-factor authentication (2FA / MFA)
-Phone number verification
-Transactional and marketing SMS notifications
-WhatsApp or voice fallback for OTP
4. We help you with compliance
Compliance is one of the biggest challenges for companies sending OTPs and transactional SMS across borders. We help you navigate sender ID regulations, traffic registration requirements, local carrier rules, and anti-fraud obligations so you don’t risk message blocking. Prelude ensures your phone number verification and 2FA flows remain compliant in every region without slowing down product development.
👉 Ready to improve your OTP delivery, reliability, and SMS costs?
Visit prelude.so/