Blog Details

By Sanjay Dey
14 Apr, 2025
IT Consultancy

🔐 How to Send OTP SMS Without DLT Using Otpless.com – A Complete Guide by Innovalogic

Since DLT (Distributed Ledger Technology) became mandatory in India for sending SMS, many businesses have faced delays, rejections, and higher costs in setting up OTP and transactional messaging. But what if you could send OTP without DLT registration, legally and instantly?

Since DLT (Distributed Ledger Technology) became mandatory in India for sending SMS, many businesses have faced delays, rejections, and higher costs in setting up OTP and transactional messaging. But what if you could send OTP without DLT registration, legally and instantly?

Meet Otpless.com — a next-gen platform that allows businesses to send OTPs without SMS using WhatsApp, Google, Email, and more.

At Innovalogic, we’ve successfully integrated Otpless for our clients' apps and platforms — helping them save cost, time, and compliance headaches.

Let’s dive in.

✅ What is Otpless?

Otpless.com is a secure One Tap Login & OTP service that replaces traditional SMS OTPs with WhatsApp OTP, Google OAuth, Email, Phone Call OTP, and even Social Login.

It eliminates the need for:

DLT registration
Template approvals
Sender ID hassles

💡 Why Use Otpless Instead of SMS OTP?

Traditional SMS OTPOtpless OTPRequires DLT registrationNo DLT neededTakes 2–7 days to approveInstant onboardingHigh failure rate98%+ delivery via WhatsAppCostly on scaleWhatsApp OTP is cheaper & reliableNo brandingYour logo & name shown in WhatsApp OTP

🌟 Key Features of Otpless

🔹 1. WhatsApp OTP (Primary Feature)

Send OTP directly to users on WhatsApp
Branding + verified sender + higher trust
Real-time delivery, click-to-login

🔹 2. Google/Email Login

One-tap login with Gmail or verified email

🔹 3. SMS & Call OTP (Optional Add-on)

If WhatsApp is not available, fallback to SMS/Call

🔹 4. Multi-platform SDKs

iOS, Android, Unity, React Native, Web, PHP, etc.

🔹 5. Login Widget & API

Ready-to-use login UI or full API access

🔹 6. Dashboard & Logs

OTP success, fail, conversion metrics

💰 Otpless Pricing & Plans (As of April 2025)

PlanFeaturesPriceFreeWhatsApp login + 500 OTPs/month₹0Starter5,000 OTPs, branded WhatsApp, basic support₹999/monthGrowth20,000 OTPs, fallback to SMS/Email, analytics₹3,999/monthEnterpriseCustom use cases, unlimited OTP, SLA supportCustom Pricing

🔐 WhatsApp OTP is included in all plans, including free.
📲 SMS fallback requires a paid plan.

⚙️ How to Integrate Otpless API

💻 Step-by-Step for PHP (Backend)

php

CopyEdit

<?php // Send OTP using Otpless API (WhatsApp Login) $phone = "+91XXXXXXXXXX"; // user number $url = "https://api.otpless.com/send-otp"; // Hypothetical endpoint

$data = [ "phone" => $phone, "via" => "whatsapp" // or "sms", "email" ];

$options = [ 'http' => [ 'header' => "Content-type: application/json\r\nAuthorization: Bearer YOUR_API_KEY", 'method' => 'POST', 'content' => json_encode($data), ], ];

$context = stream_context_create($options); $result = file_get_contents($url, false, $context); echo $result; ?>

🎮 How to Use Otpless in Unity C#

csharp

CopyEdit

using UnityEngine; using UnityEngine.Networking; using System.Collections;

public class OTPManager : MonoBehaviour { public string phone = "+91XXXXXXXXXX"; public string apiKey = "YOUR_API_KEY";

public void SendOtp() { StartCoroutine(SendOtpCoroutine()); }

IEnumerator SendOtpCoroutine() { string url = "https://api.otpless.com/send-otp"; string jsonData = JsonUtility.ToJson(new { phone = phone, via = "whatsapp" });

UnityWebRequest request = new UnityWebRequest(url, "POST"); byte[] bodyRaw = System.Text.Encoding.UTF8.GetBytes(jsonData); request.uploadHandler = new UploadHandlerRaw(bodyRaw); request.downloadHandler = new DownloadHandlerBuffer(); request.SetRequestHeader("Content-Type", "application/json"); request.SetRequestHeader("Authorization", "Bearer " + apiKey);

yield return request.SendWebRequest();

if (request.result == UnityWebRequest.Result.Success) { Debug.Log("OTP sent: " + request.downloadHandler.text); } else { Debug.LogError("OTP send failed: " + request.error); } } }

✅ Customize endpoints based on Otpless’ official API documentation.

💼 How Innovalogic Uses Otpless for Clients

At Innovalogic, we build real-money apps, games, delivery platforms, booking systems, and more. Many of our clients face issues with DLT when launching fast.

So we integrate Otpless to provide:

🔐 Instant WhatsApp OTP login
⚡ Faster onboarding for users
💸 Low cost + No compliance delay
🧠 Smarter fallback to SMS if needed

Whether you're launching a Unity-based rummy game, a kart racing app, or a salon booking app, we handle secure login with Otpless—ready to scale.

🚀 Final Thoughts

If you want OTP verification without the headache of DLT, Otpless.com is your best option. With instant onboarding, WhatsApp trust, and a powerful API, it's the modern way to handle authentication.

💡 Want Otpless integrated into your app, website, or game?
👉 Let Innovalogic take care of it. From PHP to Unity, we deliver secure, fast login experiences your users will love.

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