Challenge the Future with Technology
A clean REST API for OTPs, alerts and bulk sends — with webhooks for delivery reports, key rotation, sandbox testing and honest documentation. Running on our new platform, engineered in-house by the team behind smsgatewayprovider.com.
If your code can make an HTTPS request, it can send SMS through AvanceZone. Our SMS gateway API is a REST interface for OTP, transactional and bulk messaging in India: you POST an API key, sender ID, recipient and DLT-approved template, and you get back JSON with a message ID you can track. Delivery status arrives at your webhook in real time. There is no SMPP to negotiate, no SDK to adopt, and no compliance logic for your team to write — header routing and DND scrubbing happen inside the platform. Most teams are sending from their own application within an hour.
Typical integration time
DLR webhooks per message
API uptime SLA
API keys with audit logs
Send one message or a hundred thousand in a single call, with per-recipient personalisation.
Generate, deliver and verify OTPs with configurable length, expiry and resend rules.
Push DLRs to your callback URL in real time with status and failure reason codes.
Copy-paste examples for PHP, Python, Node.js, Java and cURL — no SDK lock-in.
Demo credits to test the full flow against your own number before production.
HTTPS-only, IP whitelisting, rate limits, key rotation and role-based team access.
Automatic template scrubbing and entity mapping — API sends stay TRAI compliant.
The same account and wallet also drive our WhatsApp Business API.
Per-key usage, delivery rates and spend visible in the dashboard, exportable as CSV.
Your API call hits infrastructure we own and monitor 24×7, not a chain of resellers. That means fewer hops, faster delivery, and support engineers who can actually read the logs when you ask a question.
One authenticated POST to /sms/send with a sender ID, a recipient and a template-matched message. Below is the same call in the languages we are asked for most. Full parameter reference, error codes and the OTP endpoints live in the dashboard docs once your account is open.
# One transactional SMS
curl -X POST https://whitelabled.securesmsc.com/api/v2/sms/send \
-H "Authorization: Bearer $API_KEY" \
-H "Accept: application/json" \
-d "sender_id=AVNZON" \
-d "recipient=919585160363" \
-d "message=Your OTP is 482913. Valid 10 min. -AVNZON" \
-d "route=transactional"$ch = curl_init('https://whitelabled.securesmsc.com/api/v2/sms/send');
curl_setopt_array($ch, [
CURLOPT_POST => true,
CURLOPT_RETURNTRANSFER => true,
CURLOPT_HTTPHEADER => ['Authorization: Bearer ' . $apiKey,
'Accept: application/json'],
CURLOPT_POSTFIELDS => [
'sender_id' => 'AVNZON',
'recipient' => '919585160363',
'message' => 'Your OTP is 482913. Valid 10 min. -AVNZON',
'route' => 'transactional',
],
]);
$res = json_decode(curl_exec($ch), true);import requests
res = requests.post(
"https://whitelabled.securesmsc.com/api/v2/sms/send",
headers={"Authorization": f"Bearer {api_key}",
"Accept": "application/json"},
data={"sender_id": "AVNZON",
"recipient": "919585160363",
"message": "Your OTP is 482913. Valid 10 min. -AVNZON",
"route": "transactional"},
timeout=12,
)
print(res.json())const res = await fetch(
'https://whitelabled.securesmsc.com/api/v2/sms/send', {
method: 'POST',
headers: {
'Authorization': `Bearer ${apiKey}`,
'Accept': 'application/json',
},
body: new URLSearchParams({
sender_id: 'AVNZON',
recipient: '919585160363',
message: 'Your OTP is 482913. Valid 10 min. -AVNZON',
route: 'transactional',
}),
});
const data = await res.json();Every accepted send returns a message ID. Register a webhook and we push the delivery receipt to you the moment the operator confirms it — or poll GET /sms/status/{message_id} if a callback URL is awkward in your environment.
Statuses map to queued, sent, delivered and failed, and failures carry a reason code, so your application can distinguish an invalid number from an operator rejection from a template mismatch.
A timeout is not a failure. If a send request times out, the message may still have been accepted and delivered. Treat that outcome as unknown and resolve it with a status query — never blindly retry, or you will bill and deliver twice. It is the mistake we see most often in new integrations.
Unicode changes the maths. A GSM-7 message fits 160 characters per segment; a Tamil or Hindi message fits 70. Long messages concatenate automatically, but the segment count is what you are billed on.
Sending commercial SMS in India requires DLT registration first — see the complete DLT registration guide, or read about our SMS gateway in India.
Sign up on the new platform, grab a key, and send your first API SMS in the next hour.