One-Time Passwords (OTPs) provide a critical layer of security by generating time-sensitive codes to verify a user's identity.

These codes are typically sent via SMS, email, or voice call. OTPs are widely used to protect logins, transactions, and other sensitive actions, making them a trusted solution for businesses that need to prevent unauthorized access.

If you're building an app, confirming user identity during onboarding and key interactions is essential. With the growing threat of identity theft and online fraud, OTPs help ensure accounts remain secure from malicious actors.

Choosing the right OTP provider has never been more important than in 2025. With AI and cyber threats on the rise and businesses expanding globally, security and reliability are non-negotiable. Users expect rapid and seamless authentication, anywhere, anytime. A strong OTP provider ensures not only that the codes are delivered fast but also that security is top-notch, protecting your platform from fraud and ensuring data privacy.

Furthermore, scalability is key: as your business grows, your OTP service should be able to handle increasing traffic without compromising performance. Ultimately, selecting the right OTP provider is a crucial step in safeguarding your users, your business, and your reputation.

What is an OTP Provider?

An OTP (One-Time Password) provider offers a service that sends temporary, time-sensitive codes to verify user identities. These codes, delivered via SMS, email, or voice, provide an additional layer of security for logins, transactions, or account updates. The idea is simple: each OTP is unique, valid for a limited time, and can only be used once.

• SMS OTP: a quick code sent via text message to a user’s phone,

• Email OTP: a code sent directly to a user’s inbox,

• Voice OTP: a code delivered via a phone call.

By offering multiple delivery methods, OTP providers ensure versatility and security.

How to choose the right OTP Provider?

Choosing the right OTP provider is more than just a technical decision, it's about ensuring a smooth, secure experience for your users. Here’s a checklist of key factors to consider:

• Speed of delivery: time is of the essence in authentication. An OTP needs to be delivered instantly, so choose a provider known for fast, reliable delivery with minimal latency,

• Global reach: your business isn’t limited to one region, and neither should your OTP provider be. Opt for a provider with global coverage that can seamlessly send codes to any country, in any time zone, without performance dips,

• Voice + SMS options: not all users rely on text messages or emails. A flexible OTP provider should offer voice OTP in addition to SMS verification and email, ensuring everyone can authenticate, even without data or text capabilities,

• API documentation quality: a great OTP service should come with clear, well-documented SMS APIs. This ensures that your developers can integrate the service quickly, without headaches or confusion,

• Pricing models: every business has different needs. Look for a provider that offers flexible and transparent pricing models. Whether it’s pay-as-you-go or monthly subscriptions, make sure you choose a provider that fits your budget and scales as you grow,

• Security features (fraud protection, encryption): security should be your top priority. Look for providers with robust fraud protection, advanced encryption standards, and compliance certifications (such as SOC2 or GDPR). Your OTP provider should offer more than just codes, it should protect your business from threats.

• Responsive customer support: When issues arise, you need answers fast. Choose a provider with accessible, responsive customer support that can help your team troubleshoot quickly and keep your authentication flows running smoothly, anytime and anywhere.

Top 10 OTP Providers compared

In today’s digital landscape, choosing the right OTP provider can make or break your security strategy. Here’s a detailed comparison of the top providers in 2025: 

1.Prelude

Prelude.so offers advanced OTP services with an emphasis on security and fraud protection. Known for its robust antifraud systems and high-end security compliance (SOC2 certified), Prelude.so delivers OTPs with superior reliability, protecting businesses against identity fraud and unauthorized access.

Strengths:

• Strong anti-fraud technology, with a clear dashboard where you can see real-time SMS delivery rates and detailed identification information.

• SOC 2 certification, ensuring high security and privacy standards.

• Competitive pricing: With our transparent business model, we don’t apply any markup on SMS. We aggregate the best prices from various operators and only charge for the API call.

• Global reach, supporting multiple delivery channels including SMS, email, and voice.

• Easy-to-integrate API documentation, designed to help developers move quickly and efficiently.

• Direct Slack support, offering hands-on assistance during integration and ongoing help whenever you need it.

Ideal for:

Companies needing a secure, fraud-protected OTP system, particularly for fintech, SaaS, Consumer Apps, and eCommerce platforms.

Pricing: 

Prelude.so offers flexible pricing to support businesses at every stage. It starts at €0.03 per verification on a pay-as-you-go basis for small teams, with the Start Up plan at €100/month including 5,000 verifications and volume discounts down to €0.015 per verification. For larger needs, custom Enterprise plans with advanced support and SLAs are available.

2.Twilio

Twilio is the industry behemoth in cloud communications, offering a robust OTP service through SMS, email, and voice.

Strengths:

• High scalability and global coverage,

• Excellent API documentation for integration,

• Real-time analytics and reporting,

• Secure infrastructure with robust encryption,

• Strong community and support.

Ideal for: 

Large enterprises and developers seeking scalable and customizable OTP solutions.

Pricing: 

Twilio offers OTP verification through its Verify API starting at $0.05 per verification, with volume discounts available as you scale. SMS delivery pricing starts separately at $0.0079 per message. Flexible pay-as-you-go plans and free trial options make it easy to integrate and expand as needed.

3.MessageBird

MessageBird offers a comprehensive OTP service with seamless delivery across SMS, email, and voice channels. It’s known for its reliable global coverage and high delivery success rates.

Strengths:

• Wide global reach with presence in over 200 countries,

• Excellent SMS and voice OTP delivery,

• Highly secure, with end-to-end encryption,

• Customizable solutions for businesses of all sizes.

• 24/7 customer support.

Ideal for: 

Businesses looking for a reliable, global OTP provider with high delivery success rates. 

4. Plivo

Plivo offers a flexible, API-driven OTP service with an emphasis on speed and security. Known for its developer-friendly interface, Plivo is ideal for businesses looking to build custom OTP solutions with minimal complexity.

Strengths:

• Flexible API for custom OTP solutions,

• Fast delivery and high reliability,

• Supports both SMS and voice OTP,

• Strong focus on security with encryption,

• Transparent, pay-as-you-go pricing.

Ideal for: 

Developers and businesses looking for a customizable and cost-effective OTP service. 

Pricing: 

Plivo offers pay-as-you-go OTP verification with SMS messages starting at $0.06637 per message and voice calls from $0.0195 per minute. As your usage grows, automatic volume discounts unlock additional savings. Flexible pricing models are available for businesses scaling their authentication needs.

5. Sinch

Sinch is a leading provider of cloud communication services offering reliable OTP delivery via SMS, email, and voice. It’s recognized for its high-quality service and easy integration.

Strengths:

• Highly secure with strong encryption and fraud prevention,

• Global coverage with fast OTP delivery,

• Developer-friendly with easy API integration,

• Flexible pricing that scales with your needs,

• Excellent customer support.

Ideal for: 

Companies looking for an easy-to-integrate, secure OTP provider.

Pricing: 

Sinch uses a transparent pay-as-you-go model, with SMS messages priced at $0.1709 per outbound message. While on the higher end, pricing reflects premium delivery and service reliability. Businesses can also access two-way messaging options and SMS-enabled numbers with additional setup and monthly fees.

6.Infobip

Infobip is a major player in the OTP space, offering comprehensive authentication solutions with exceptional global reach and multichannel delivery options.

Strengths:

• Excellent global coverage,

• High delivery success rates,

• Multichannel delivery: SMS, email, voice, and more,

• Strong security features, including fraud protection and encryption,

• Developer-friendly API.

Ideal for: 

Global businesses needing a multichannel OTP solution.

Pricing: 

Infobip uses a volume-based pricing model tailored to your region and message volume. For example, sending 60,000 SMS in France would cost around €3,720, or approximately €0.062 per message. Pricing varies by country and scale, with estimates available through their online calculator.

7.Vonage (Nexmo)

Vonage provides reliable OTP delivery across SMS, email, and voice channels. Known for its high availability and easy API integration, Nexmo is trusted by businesses worldwide.

Strengths:

• Global network for high availability,

• Real-time delivery status tracking,

• Strong focus on security with encryption,

• Flexible pricing options for businesses of all sizes,

• 24/7 customer support.

Ideal for: 

Developers and businesses looking for a scalable, flexible OTP service.

Pricing: 

Vonage offers OTP delivery via SMS with pay-as-you-go pricing starting at $0.08394 per message. Rates may vary slightly by destination. For teams with advanced needs, additional APIs like audit and reporting tools are available as add-ons.

8.SMSCountry

SMSCountry provides cost-effective OTP services with a strong focus on India. It’s perfect for businesses targeting the Indian market but also offers global solutions.

Strengths:

• Great for India: Excellent coverage and reliability in India,

• Simple, easy-to-use platform,

• Competitive pricing,

• Reliable SMS OTP delivery,

• Good customer support.

Ideal for: 

Indian businesses and companies focusing on the Indian market.

9.MSG91

MSG91 provides a reliable OTP solution with a focus on SMS-based authentication. It’s popular in the Indian market, but also offers global coverage.

Strengths:

• Strong India focus with high delivery rates,

• SMS OTP as its core offering,

• Affordable and transparent pricing,

• Good customer support,

• Integration-friendly API.

Ideal for: 

Companies needing cost-effective SMS OTP services, particularly in India.

Pricing: 

MSG91 offers OTP delivery at $0.008 per message (example pricing for the U.S.), with custom plans available depending on volume and location. Businesses can connect with their team for tailored solutions that fit their needs.

10. Exotel

Exotel offers an affordable OTP service, especially popular in India. It provides strong SMS-based OTP delivery with a focus on reliable communication solutions for businesses in the Indian market and beyond.

Strengths:

• Strong India focus with high delivery rates,

• Simple integration with easy-to-use APIs,

• Cost-effective and scalable pricing,

• Reliable SMS OTP service with strong security,

• Good customer support.

Ideal for: 

Companies seeking reliable OTP services in Asia-Pacific or global businesses with a focus on these regions.

Pricing: 

Exotel offers bundled plans starting at ₹9,999 for 5 months, which include rental fees, credits for messaging and calls, and basic features like IVR and multichannel support. Higher plans with more credits and unlimited agents are also available. Custom solutions can be tailored for enterprise needs.

Best OTP Providers for India

India is a rapidly growing market for digital services, and OTP providers play a crucial role in ensuring secure authentication for users across the country. With a booming eCommerce sector, fintech growth, and increasing mobile usage, it’s essential to choose the right provider for quick and reliable OTP delivery.

Here’s a list of some of the best OTP providers in India:

• Prelude.so: offers competitive pricing in India, along with robust security features, fraud protection, and a global reach,

  
  

• MSG91: a popular choice in India, offering reliable SMS OTP services with strong support and affordable pricing,

  
  

• Exotel: a provider that excels in SMS OTP delivery with a strong focus on India and a simple, easy-to-use platform.

These providers offer strong OTP services in India, ensuring fast, secure delivery and flexible pricing models that cater to the unique needs of businesses in this region.

FAQs about OTP Providers

What is the cheapest OTP provider?

The cheapest OTP provider depends on your usage and location. Providers like Prelude offer affordable pricing with competitive rates, especially for small to medium-sized businesses. Always check the pricing model that best fits your business needs.

Can you get free OTP services?

While some OPT providers offer free trials, ongoing OTP services typically aren’t free. Free services often come with limited features or lower delivery success rates. It’s important to weigh cost vs. security when choosing a provider. 

What is better: email OTP or SMS OTP?

Both have their pros and cons. SMS OTP is generally faster and more widely accessible, while email OTP can be more secure but may take longer to reach. Consider your audience and choose the method that best suits their needs and your security standards. 

What security features should you look for in an OTP provider?

Look for providers with strong encryption, fraud protection, and compliance certifications (like SOC2 or GDPR). A good provider should also offer risk scoring and real-time fraud detection to protect both your users and your business from security threats or monetary fraud like SMS pumping.

Conclusion

Choosing the right OTP provider is a crucial decision for any business in 2025. With the increasing demand for speed, security, and scalability, it’s essential to select a provider that not only delivers fast and reliable OTPs but also offers strong fraud protection and global reach. Whether you’re a small startup or an enterprise, ensuring your users’ security while enabling smooth authentication experiences is key to maintaining trust and growing your business.