SMS Gateway Master

Transform your Android phone into a professional SMS gateway with a REST API.

SMS Gateway Master is an Android app by Simpapp that turns any Android smartphone into a programmable SMS gateway. Send SMS programmatically via REST API using your own phone number and carrier — no Twilio, no Vonage, no per-message fees.

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What It Does

• 📤 Send SMS via REST API — HTTP POST from any language or tool
• 📥 Receive & forward incoming SMS — webhook POST to your server in real time
• 🤖 Auto-reply — return {"sms_text": "reply"} and the app sends it automatically
• 🔗 Delivery webhooks — real-time status: queued → sent → delivered / failed
• 📊 Statistics API — daily and monthly SMS usage stats
• 🔒 Privacy-first — messages never stored in cloud, local-only via Room DB

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Quick Start

1. Install the app

Download SMS Gateway Master on Google Play

Set it as your default SMS app and generate an API key in Settings → Gateway API.

2. Send your first SMS

curl -X POST https://us-central1-sms-gateway-ae7e1.cloudfunctions.net/api_sms_send \
  -H "X-API-Key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"phoneNumber": "+1234567890", "message": "Hello from SMS Gateway Master!"}'

Response:

{
  "smsId": "sms_1707400000000_abc123",
  "status": "queued",
  "timestamp": "2026-04-11T12:00:00.000Z"
}

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Code Examples

Python

import requests

response = requests.post(
    'https://us-central1-sms-gateway-ae7e1.cloudfunctions.net/api_sms_send',
    headers={'X-API-Key': 'YOUR_API_KEY', 'Content-Type': 'application/json'},
    json={'phoneNumber': '+1234567890', 'message': 'Hello from Python!'}
)
print(response.json())

Node.js

const response = await fetch(
  'https://us-central1-sms-gateway-ae7e1.cloudfunctions.net/api_sms_send',
  {
    method: 'POST',
    headers: { 'X-API-Key': 'YOUR_API_KEY', 'Content-Type': 'application/json' },
    body: JSON.stringify({ phoneNumber: '+1234567890', message: 'Hello from Node.js!' })
  }
);
console.log(await response.json());

PHP

$ch = curl_init('https://us-central1-sms-gateway-ae7e1.cloudfunctions.net/api_sms_send');
curl_setopt_array($ch, [
    CURLOPT_POST => true,
    CURLOPT_POSTFIELDS => json_encode(['phoneNumber' => '+1234567890', 'message' => 'Hello from PHP!']),
    CURLOPT_HTTPHEADER => ['X-API-Key: YOUR_API_KEY', 'Content-Type: application/json'],
    CURLOPT_RETURNTRANSFER => true,
]);
echo curl_exec($ch);

Two-Way SMS / Auto-Reply (Node.js)

const express = require('express');
const app = express();
app.use(express.json());

app.post('/sms-webhook', (req, res) => {
  const { type, sender, message } = req.body;

  if (type === 'incoming_sms') {
    console.log(`SMS from ${sender}: ${message}`);
    // Auto-reply
    return res.json({ sms_text: `Got your message: "${message}"` });
  }
  res.sendStatus(200);
});

app.listen(3000);

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API Reference

Endpoint	Method	Description
/api_sms_send	POST	Send an SMS
/api_sms_requestStatus	POST	Check status / retry failed SMS
/api_sms_getStatistics	GET	SMS usage statistics

Base URL: https://us-central1-sms-gateway-ae7e1.cloudfunctions.net

Authentication: X-API-Key: YOUR_API_KEY header on all requests.

📖 Full API Documentation

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Pricing

Plan	Price	Daily Limit
Free Trial	€0 (7 days)	100 SMS/day
PRO Monthly	€5 / month	10,000 SMS/day
PRO Annual	€52 / year	10,000 SMS/day

No per-message fees. SMS delivery uses your own carrier plan.

💰 Full pricing + comparison vs Twilio / Vonage

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Use Cases

Use Case	Guide
Send SMS to customers (WooCommerce, Shopify)	Guide →
Bulk SMS campaigns (up to 10,000/day)	Guide →
WooCommerce order notifications (no plugin)	Guide →
Two-way SMS + AI chatbot	Guide →
Home Assistant / n8n / Zapier / Make	Docs →

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Integrations

Works with any tool that can make HTTP POST requests:

E-commerce: WooCommerce · Shopify · PrestaShop

Automation: Zapier · Make (Integromat) · n8n · Home Assistant · Node-RED · IFTTT · Power Automate

Languages: Python · Node.js · PHP · Java · C# · Ruby · Go · Bash

Spreadsheets: Excel VBA · Google Sheets (Apps Script)

📦 Download ready-to-use scripts

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vs Twilio / Vonage / AWS SNS

	SMS Gateway Master	Twilio	Vonage	AWS SNS
10,000 SMS/month	€5 flat	~$75	~$63	~$64.50
Per-message fee	None	$0.0075+	$0.0063+	$0.00645+
Phone number	Your own SIM	Virtual (+cost)	Virtual (+cost)	Virtual (+cost)
Data privacy	Local only	Cloud	Cloud	Cloud
Setup time	5 minutes	Account + compliance	Account + compliance	AWS config

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Links

• 🌐 Website: https://sms-gateway-ae7e1.web.app/
• 📖 Documentation: https://sms-gateway-ae7e1.web.app/documentation.html
• 🚀 Live SMS Tester: https://sms-gateway-ae7e1.web.app/sms-tester.html
• 💰 Pricing: https://sms-gateway-ae7e1.web.app/pricing.html
• 📲 Google Play: https://play.google.com/store/apps/details?id=com.simpapp.textsmsdefault
• 📧 Support: support-apps@googlegroups.com
• 💬 WhatsApp: https://wa.me/40763030303

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Topics

sms sms-gateway android rest-api sms-api webhook automation woocommerce twilio-alternative bulk-sms two-way-sms sms-chatbot home-assistant zapier n8n