Prelude
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SMS API for user verification with anti-spam and cost-effective solutions.
Prelude Product Information
Prelude | OTP & SMS verification API for developers
Prelude is an SMS verification API designed to help applications verify users via one-time passwords (OTPs) sent through global SMS delivery. It emphasizes high deliverability, cost efficiency, anti-fraud protections, and easy integration for developers, startups, and enterprises alike. The service offers multi-channel routing, real-time analytics, and pre-approved templates to streamline integration and improve OTP conversions while reducing spam and fraud.
Key Use Cases
- Real-time user verification to secure sign-ups and logins
- OTP-based authentication workflows across web and mobile apps
- Global SMS delivery with intelligent routing to optimize cost and delivery success
How It Works
- The application calls Prelude's Verify API with a target phone number.
- Prelude automatically selects the best route and channels for the destination country across 230+ countries and 5 channels (e.g., SMS, WhatsApp, Viber, Zalo, etc.).
- An OTP is delivered to the user, and the verification result is returned to the application.
- Real-time analytics and dashboards provide insights into delivery, conversion, and performance.
Prelude uses multiple layers of fraud protection to ensure only legitimate users are verified, while minimizing costs and spam.
Core Features
- Global reach: deliver to 230+ countries with multi-channel routing
- 5 communication channels per country to optimize delivery and cost
- Automatic route optimization to use the lowest-cost, highest-delivery path
- Real-time analytics and intuitive visualizations for performance monitoring
- Granular, actionable insights to identify issues and optimize delivery
- Anti-fraud layers to block spam and fraudulent activity while preserving legitimate verifications
- Pre-approved, conversion-optimized templates to simplify integration
- Minimal API surface: two simple endpoints to handle 1000+ routes; supports multiple programming languages
How to Use Prelude
- Start for free to explore the API and templates
- Use the Verify API endpoint to initiate a phone-number verification
- Leverage multi-language SDKs and comprehensive documentation for quick integration
- Monitor performance with real-time dashboards and reports
Safety and Compliance
- Designed to reduce fraud and protect user data
- Transparent pricing and documentation to help manage costs
- Best practices guidance for compliant usage of OTP and verification
Pricing and Availability
- Global pricing with region-specific considerations (US, France, UK, Japan, Germany and more)
- Transparent, no-surprise costs with multi-channel routing and optimized delivery
What It Delivers
- Higher OTP conversion rates and lower downtime through reliable routing
- Reduced spam and fraud while maintaining legitimate user verification
- Scalable verification capable of handling high volumes across diverse markets
Technologies and Endpoints
- Verify API: curl example provided; simple payload targeting a phone_number type
- Transactional API and Watch API available for broader verification workflows and monitoring
Why Choose Prelude
- Built for developers with easy integration and strong documentation
- Robust infrastructure to manage peak loads and high-volume verifications
- Dedicated support options for teams needing tailored assistance
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