High-Speed OTP SMS API for .NET C#
Drop our production-tested REST API directly into your .NET C# app without extra dependencies. Empower your verification pipeline with NizoraSMS under 2.5-second OTP delivery, 99.9% uptime, and low-cost rates from ₹0.16/SMS.
using var client = new HttpClient();
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", apiKey);
var content = new StringContent(JsonSerializer.Serialize(new { mobile = phone, otp = code }), Encoding.UTF8, "application/json");
var response = await client.PostAsync("https://nizorasms.com/api/v1/otp/send", content);Explore OTP API Across Stacks & Industries
Pre-configured solutions and fast integration guides across India's top development environments.
Frequently Asked Questions
Everything you need to know about setting up high-speed OTP verification.
How fast is NizoraSMS OTP delivery for this integration?
NizoraSMS delivers OTPs in under 2.5 seconds with dedicated high-priority telecom pipes across Jio, Airtel, Vodafone Idea (Vi), and BSNL in India.
Is DLT registration required?
Yes, as per TRAI regulations in India. NizoraSMS provides instant pre-approved compliant OTP templates so you can test and launch immediately.
How much does NizoraSMS cost per OTP?
Pricing starts from ₹0.16 to ₹0.28 per OTP with flexible pay-as-you-go wallet recharges starting at just ₹200 with zero monthly lock-ins.