High-speed, cost-effective transactional email for Indian startups & developers
Deliver OTP verification codes, payment receipts, and AI notifications with low latency across India. DPDP Act 2023 compliance, and affordable scale pricing.
Drop into your application in under 60 seconds
Native typed interfaces with zero unnecessary dependencies. Built for standard fetch and modern edge runtimes.
import { SadaSend } from 'sadasend';
// Accepted and queued on the call; delivery is asynchronous
const sadasend = new SadaSend(process.env.SADASEND_API_KEY!);
export async function sendOtpVerification(user: { email: string; otp: string }) {
const result = await sadasend.emails.send({
from: 'Verify <auth@yourdomain.in>',
to: user.email,
subject: `${user.otp} is your verification code`,
html: `<p>Your one-time code is <strong>${user.otp}</strong>. Valid for 10 minutes.</p>`,
tags: ['otp', 'in-region']
});
console.log('Accepted, message id:', result.id);
return result;
}Accepted on the API call and queued durably, for OTP delivery and high-volume e-commerce scale.
Engineered for high deliverability and zero incident risk
Every layer from edge connection pooling to per-key rate limits is designed to keep critical transactional dispatches fast, reliable, and contained.
DPDP Act 2023 Alignment
Local Indian edge nodes process API calls locally, avoiding high latency over trans-Pacific cables to ensure OTPs arrive in seconds.
DPDP Act 2023 Alignment
Complies with Digital Personal Data Protection Act requirements for data encryption, recipient consent, and security auditing.
Affordable Scale Pricing
Engineered for high-volume Indian startups. Save up to 70% compared to legacy providers with excessive dollar conversion fees.
Instant OTP & Auth Delivery
fast ingestion ensures time-critical 2FA verification codes and password reset links land in user inboxes before expiring.
AI Agent Guardrails & Tripwires
Prevent unintended cost spikes from autonomous AI agents with strict per-hour velocity limits and recipient allowlists.
6,000 Free Monthly Sends
Generous permanent free tier with custom .in and .co.in domain DKIM signatures, webhook callbacks, and delivery logs.
SadaSend vs US-Based Legacy Providers
Why Indian startups choose SadaSend over expensive legacy providers with slow international routing.
| Feature & Capability | SadaSend | US-Based Legacy Providers |
|---|---|---|
| Accepted and queued on the API call | Routes calls to US servers (280ms+ lag) | |
| OTP Delivery Speed | < 1.5 seconds end-to-end | 10–45 second queue delays |
| Competitive Pricing for High Volume | Transparent flat scale tiers | Expensive USD billing with heavy markups |
| AI Agent Safety Controls | ||
| Synchronous API Error Reporting | 202 Accepted with silent drops | |
| Free Tier with Custom Domain | 6,000 sends forever | Severe trial limitations |
Start with 3,000 emails every month at zero cost
No artificial paywalls on security. Unlike legacy providers that reserve recipient allowlists or dedicated IP pools for high enterprise tiers, every SadaSend account receives full safety controls from day one.
Everything you need to know about transactional email API India
Clear, transparent answers on deliverability, API authentication, and rate limits.
Related developer guides and architectural tutorials
Explore step-by-step production implementation blueprints, benchmarks, and protocols.
REST API Reference & Endpoints
Complete REST API reference for sending emails, managing API keys, tracking delivery events, and configuring recipient allowlists with low latency.
SMTP relay & framework integrations
Connect existing applications, WordPress, Supabase, Laravel, Django, and Nodemailer to SadaSend via standard SMTP relay with zero code changes.
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