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Prelude | OTP & SMS Verification API for Developers

Prelude is an OTP and SMS verification API designed for developers, offering cost-effective solutions for authentication and verification needs.

PaidAPIPricing checked: Sep 20, 2026
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Best for

Mobile apps, fintech platforms, and developers verifying user phone numbers globally via optimized SMS and WhatsApp routing.

Things to know

No ongoing free tier; carrier delivery costs vary by destination country and are billed transparently.

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About this tool

Overview

Discover the power of Prelude, the OTP and SMS verification API designed for developers. With cost-effective solutions and a robust anti-fraud system, Prelude is the perfect choice for authentication and verification needs.

Cost-Effective Solutions

Prelude offers cost-effective solutions for authentication and verification needs, with optimized SMS delivery and reduced costs.

Robust Anti-Fraud System

Prelude's anti-fraud system uses machine learning and advanced algorithms to prevent spam and abuse, ensuring high-quality routes and optimal deliverability.

High-Quality Routes

Prelude provides high-quality routes for optimal deliverability, with a network of over 20 leading global and local text-message providers.

Easy Integration

Prelude offers a simple and easy-to-use API for integration, with documentation and support available for developers.

Get started

  1. Open the official website and confirm the service is available in your region.
  2. Check the current plan, usage limits and terms for your intended use.
  3. Try a small task with sample data before committing to a paid plan.

Editorial note

Pricing checked: Sep 20, 2026. Pay-as-you-go pricing from €0.032 per verification plus pass-through carrier SMS costs (zero markup); Startup plan is €360/mo for dedicated SLA and custom Sender ID.

Record updated: Sep 20, 2026

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