WhatsApp Broadcasts

Broadcast to Millions on WhatsApp

Send templated messages to thousands of opted-in contacts with real-time delivery tracking, rich media support, and intelligent throttling — all via a single API call.

Start Broadcasting

✦ No credit card required · Free plan available · Setup in 5 minutes

Official, Zero-Ban Risk Broadcasting

StartMessaging utilizes Meta's official Cloud API structure. By sending pre-approved templates (Utility, Marketing, or Authentication) to opted-in audiences, you bypass the spam filters that trigger number bans. Our intelligent system manages delivery rates dynamically to keep your sender score high.

Supports up to 100K+ contacts per broadcast
Rich media support: images, documents, interactive buttons
Real-time delivery confirmation and read receipts

Outreach Comparison

Broadcast vs. Campaigns vs. Unofficial Spam Blasting

Why choosing official broadcasts protects your brand reputation and phone number.

Comparison Metrics	StartMessaging Broadcast	Sequence Campaigns	Unofficial Web Scrapers
Setup Time	Instant (Direct API)	Instant (Sequence Flow Builder)	Requires manual web login
Opt-In Compliance Checks	Required	Required	✗ (High spam rate)
Delivery Speed	Up to 80 messages/second	Throttled based on trigger rules	Very slow (manual delays)
Phone Number Ban Risk	0% (TRAI/Meta Compliant)	0% (TRAI/Meta Compliant)	99% (Immediate number block)

Broadcast API

Trigger a Broadcast Message Programmatically

curl -X POST https://api.startmessaging.com/v1/broadcast \
  -H "Content-Type: application/json" \
  -H "X-API-Key: sm_live_your_api_key_here" \
  -d '{
    "templateName": "order_shipped",
    "languageCode": "en",
    "recipients": ["+919876543210", "+918765432109"],
    "variables": {
      "+919876543210": { "name": "Rahul", "orderId": "#5521" },
      "+918765432109": { "name": "Aarav", "orderId": "#5522" }
    }
  }'

const response = await fetch("https://api.startmessaging.com/v1/broadcast", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "X-API-Key": "sm_live_your_api_key_here",
  },
  body: JSON.stringify({
    templateName: "order_shipped",
    languageCode: "en",
    recipients: ["+919876543210", "+918765432109"],
    variables: {
      "+919876543210": { name: "Rahul", orderId: "#5521" },
      "+918765432109": { name: "Aarav", orderId: "#5522" }
    }
  })
});

const data = await response.json();
console.log(data);

import requests

response = requests.post(
    "https://api.startmessaging.com/v1/broadcast",
    headers={
        "Content-Type": "application/json",
        "X-API-Key": "sm_live_your_api_key_here",
    },
    json={
        "templateName": "order_shipped",
        "languageCode": "en",
        "recipients": ["+919876543210", "+918765432109"],
        "variables": {
            "+919876543210": { "name": "Rahul", "orderId": "#5521" },
            "+918765432109": { "name": "Aarav", "orderId": "#5522" }
        }
    }
)

print(response.json())

$ch = curl_init("https://api.startmessaging.com/v1/broadcast");

curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_POST => true,
    CURLOPT_HTTPHEADER => [
        "Content-Type: application/json",
        "X-API-Key: sm_live_your_api_key_here",
    ],
    CURLOPT_POSTFIELDS => json_encode([
        "templateName" => "order_shipped",
        "languageCode" => "en",
        "recipients" => ["+919876543210", "+918765432109"],
        "variables" => [
            "+919876543210" => ["name" => "Rahul", "orderId" => "#5521"],
            "+918765432109" => ["name" => "Aarav", "orderId" => "#5522"]
        ]
    ]),
]);

$response = curl_exec($ch);
curl_close($ch);
$data = json_decode($response, true);

import java.net.http.*;
import java.net.URI;

HttpClient client = HttpClient.newHttpClient();
String body = """
    {
      "templateName": "order_shipped",
      "languageCode": "en",
      "recipients": ["+919876543210", "+918765432109"],
      "variables": {
        "+919876543210": { "name": "Rahul", "orderId": "#5521" },
        "+918765432109": { "name": "Aarav", "orderId": "#5522" }
      }
    }
    """;

HttpRequest request = HttpRequest.newBuilder()
    .uri(URI.create("https://api.startmessaging.com/v1/broadcast"))
    .header("Content-Type", "application/json")
    .header("X-API-Key", "sm_live_your_api_key_here")
    .POST(HttpRequest.BodyPublishers.ofString(body))
    .build();

HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
System.out.println(response.body());

package main

import (
  "bytes"
  "encoding/json"
  "fmt"
  "net/http"
  "io"
)

func main() {
  payload, _ := json.Marshal(map[string]interface{}{
    "templateName": "order_shipped",
    "languageCode": "en",
    "recipients": []string{"+919876543210", "+918765432109"},
    "variables": map[string]interface{}{
      "+919876543210": map[string]string{ "name": "Rahul", "orderId": "#5521" },
      "+918765432109": map[string]string{ "name": "Aarav", "orderId": "#5522" },
    },
  })

  req, _ := http.NewRequest("POST", "https://api.startmessaging.com/v1/broadcast", bytes.NewBuffer(payload))
  req.Header.Set("Content-Type", "application/json")
  req.Header.Set("X-API-Key", "sm_live_your_api_key_here")

  resp, _ := http.DefaultClient.Do(req)
  defer resp.Body.Close()
  body, _ := io.ReadAll(resp.Body)
  fmt.Println(string(body))
}

Broadcast API Sandbox — Coming Soon This API route is under construction. Sandbox access is available for early adopters. Request Sandbox Access

FAQs

Broadcast — Frequently Asked Questions

How many contacts can I send a broadcast to?

There's no hard limit on our side. You can broadcast to 100,000+ contacts per campaign. Meta applies per-phone-number throughput limits (typically 80 messages/second for Tier 4 numbers). Our engine handles throttling automatically.

Do I need to use pre-approved templates for broadcasts?

Yes. WhatsApp requires all business-initiated messages to use pre-approved templates. You can create templates through our dashboard. Most templates are reviewed and approved by Meta within minutes.

Is broadcasting on WhatsApp compliant with local anti-spam regulations?

Yes, official broadcasts are fully compliant because they require recipient opt-in and utilize pre-approved templates.

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