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Bulk Messaging API

Official Bulk Messaging at Scale

Blast high-volume notifications to opted-in audiences. Run on official Meta daily limit tiers from 1,000 to unlimited messages without risk of number blocking. Equipped with built-in queue throttling and SMS fallback.

Start Bulk Sending

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

Zero-Ban Risk Enterprise Throughput

Unlike unofficial browser-scraping tools that immediately trigger WhatsApp spam blocks, StartMessaging works directly with Meta's official Cloud API. You can safely send thousands of transactions simultaneously, backed by our smart scheduling engine that queues messages to match your account's quality rating.

  • Supports Meta Tier 1 (1k/day) to Tier 4 (Unlimited/day)
  • Automated fallback to DLT-compliant SMS when receiver lacks internet
  • Comprehensive webhook tracking for delivery and read statistics
Bulk Sending Dashboard Analytics View
Platform Details

Engineered for Enterprise Performance

  • Load Balancing

    Distribute broadcast traffic across multiple verified sender numbers to maximize outbound throughput.

  • Compliance Guards

    Automatic unsubscribe opt-out link parsing to keep user report rates low and maintain number quality.

  • Smart Queueing

    Throttles outgoing messages during peak traffic to maintain high delivery success ratios without server lag.

  • Visual Media Delivery

    Include personalized image/video files, dynamic PDF receipt attachments, and quick-reply buttons.

Bulk Verification

Official Bulk API vs. Unofficial Broadcasters vs. Traditional SMS Blasts

Compare features, ban rates, and delivery speeds to make the optimal decision for your enterprise scale.

Comparison Point StartMessaging Bulk API Unofficial Scraping Apps Traditional SMS Blasts
Account Ban Risk 0% (Fully TRAI/Meta Compliant) 99% (Highly vulnerable to bans) 0% (Carrier regulated)
Delivery Speeds Up to 250 messages/second Throttled to 1-2 per minute Slow network spikes
Interactive Rich Media ✓ (Images, Videos, Buttons) ✓ (Prone to flagging) ✗ (Text only / MMS cost-prohibitive)
Detailed Open Tracking ✓ (Delivery & Read receipts) ✗ (Manual log checks) ✗ (No open indicators)
API Reference

Trigger a Bulk Dispatch Programmatically 

curl -X POST https://api.startmessaging.com/v1/bulk-messages \
  -H "Content-Type: application/json" \
  -H "X-API-Key: sm_live_your_api_key_here" \
  -d '{
    "campaign_name": "holiday_promo_2026",
    "template_name": "festive_offer",
    "recipients": [
      { "phone": "+919876543210", "vars": {"name": "Amit", "code": "FEST20"} },
      { "phone": "+918765432109", "vars": {"name": "Pooja", "code": "FEST25"} }
    ]
  }'
const response = await fetch("https://api.startmessaging.com/v1/bulk-messages", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "X-API-Key": "sm_live_your_api_key_here"
  },
  body: JSON.stringify({
    campaign_name: "holiday_promo_2026",
    template_name: "festive_offer",
    recipients: [
      { phone: "+919876543210", vars: { name: "Amit", code: "FEST20" } },
      { phone: "+918765432109", vars: { name: "Pooja", code: "FEST25" } }
    ]
  })
});
import requests

res = requests.post(
    "https://api.startmessaging.com/v1/bulk-messages",
    headers={
        "Content-Type": "application/json",
        "X-API-Key": "sm_live_your_api_key_here"
    },
    json={
        "campaign_name": "holiday_promo_2026",
        "template_name": "festive_offer",
        "recipients": [
            { "phone": "+919876543210", "vars": {"name": "Amit", "code": "FEST20"} },
            { "phone": "+918765432109", "vars": {"name": "Pooja", "code": "FEST25"} }
        ]
    }
)
Bulk Messaging API Sandbox — Coming Soon This API route is under construction. Sandbox access is available for early adopters. Request Sandbox Access
FAQs

Bulk Sending — Frequently Asked Questions

What is the daily sending limit on official WhatsApp Bulk API?

Meta assigns numbers to tiers starting at Tier 1 (1,000 unique recipients/24h), moving to Tier 2 (10,000), Tier 3 (100,000), and Tier 4 (unlimited). Your tier automatically upgrades based on sending volume and number quality score.

How do you protect the phone number from being banned?

Because we use official WhatsApp Cloud API, you are completely compliant. However, if customers actively block or report your messages, your number score decreases. We recommend sending exclusively to opted-in clients, personalized templates, and offering a quick 'Stop' button.

Are there local guidelines for bulk messaging limits and integrations?

Yes, all bulk messaging must follow local opt-in rules and Meta BSP platform limits.

Related Pages

Broadcast Messaging Marketing Campaigns Utility Notifications Pricing Details
WhatsApp API

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