The SMS API built for scale and reach
Send smarter messages, reach more customers, and build reliable communication workflows with an API designed for developers and built for scale.
Ready for takeoff
Swift SMS Gateway's SMS API provides you with everything you need to add text-messaging to your business seamlessly and securely.
Designed to Scale
Whether you're sending a few hundred messages or a million, Swift's messaging infrastructure handles the volume without breaking a sweat. Build one and scale easily when you need to.
Engage Directly
Two-way messaging means real conversations. Reach. your customers instantly and give them a frictionless channel to respond directly.
Best in Class Support
Our team of real expert humans is standing by to help you build, troubleshoot, and scale. From your first API call to you millionth message, we're with you every step of the way.
Start building with the Swift SPI, your way.
Our simple documentation has everything you need to get your first message sent in minutes. Whether you're building a quick integration or a complex communication platform, Swift gives you the tools to do it right.
const axios = require('axios');async function sendSMS(phoneNumber, message) { try { const response = await axios.post('https://api.swiftsmsgateway.com/v1/sms', { to: phoneNumber, message: message, from: 'YourSender' }, { headers: { 'Authorization': 'Bearer YOUR_API_KEY', 'Content-Type': 'application/json' } }); console.log('SMS sent successfully:', response.data); return response.data; } catch (error) { console.error('Error sending SMS:', error); throw error; }}// Example usagesendSMS('+1234567890', 'Hello from Swift SMS Gateway!');Use and API that's feature loaded
Dedicated Longcode
Get a dedicated long code number for your business to send and receive messages with a consistent sender identity.
Outbound Messaging
Send SMS messages to any mobile number with reliable delivery and real-time status tracking through our powerful API.
Inbound Messaging
Receive incoming SMS messages and route them to your application in real-time with automatic message parsing.
International Texting
Reach customers worldwide with international SMS support across hundreds of countries and carriers.
Mass Broadcasting
Send bulk SMS campaigns to large audiences with scheduled delivery, throttling controls, and detailed analytics.
Simplify everyday interactions
Our API handles every communication your business needs. From urgent alerts to everyday reminders, Swift SMS powers the interactions that keep your business running.
Emergency Alerts
Deliver PSAs, warnings, community alerts, and more quickly and reliably. SMS is the best way to relay critical information directly.
Learn MoreCustomer Support
Cut down the number of customers that you put on hold and provide a higher quality of customer service with SMS.
Learn MoreAuthentication
Prevent fraud and improve your user security with SMS authentication. The Swift SMS API has been used to deliver hundreds of millions of authentication PINs globally.
Learn MoreBilling & Payments
Automate the delivery of critical billing and payment information reliably. Nothing beats the speed and directness of SMS.
Learn MoreNotifications & Reminders
Send delivery details and prevent no-shows to improve your customer service with the reliability and directness of SMS.
Learn MoreMarketing & Promotions
Increase your conversion rates and customer engagement with a direct connection for your marketing campaigns.
Learn MoreGet the most out of your business texting
See how text-messaging can elevate how your business communicates and stay up-to-date with industry standards and guidelines.
SMS One-Time Password: How It Works, Safety and Setup
Discover how one-time passwords work and get step-by-step instructions on setting up SMS OTP for robust authentication.
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Maximize SMS ROI and Avoid Carriers Blocking Your SMS
Explore strategies to maximize SMS marketing ROI, from segmentation to A/B testing. Track success rates with SwiftSMSGateway for optimal results.
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SMS 2FA Verification: Use Text Pins to Combat Fraud
When you need greater security and convenience, SMS text verification is an ideal solution. Verify with SMS to help keep your customers’ information secure.
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Blocked Text: Understand Message Errors and Improve Verification
Discover solutions for blocked messages, handling invalid or incorrect numbers, ensuring carrier verification for mass texting and dealing with spam flagging.
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Text to Subscribe: Cultivate Frictionless Opt-In
Discover the effectiveness of a text subscription service to revolutionize your SMS marketing strategy.
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The Importance of SMS Frameworks and Adaptability
Identifying the best framework provided by your SMS aggregator is crucial to your company’s communication infrastructure. Learn the full importance of CSP services in this guide.
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SMS Smishing: Protect Yourself From Attack
Protect against smishing attacks. Swift SMS Gateway’s guide reveals tactics used by cybercriminals & offers effective prevention measures. Stay secure, credible, and ahead.
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Short Code or 10DLC: What’s Appropriate in Business Communications?
Find out what the different types of short code are, when to use them and where to get one for your business communication initiatives.
Read full articleFrequently asked questions
An SMS API is a programming interface that allows your application to send and receive text messages through a messaging gateway. It works by accepting HTTP requests from your application, converting them into SMS messages, and routing them through carrier networks to the recipient's phone. Responses, delivery receipts, and inbound messages are returned via webhooks or polling.
Sending your first message is straightforward. Sign up for a Swift SMS Gateway account, obtain your API credentials, and make a simple HTTP POST request with the recipient's phone number, your sender number, and the message body. Our API supports REST calls from any programming language. Check our developer documentation for code examples and quick-start guides.
The Swift SMS API supports messaging across the United States and Canada, covering all major carriers including AT&T, Verizon, T-Mobile, Rogers, Bell, and Telus. Messages are routed through direct carrier connections for reliable delivery and fast throughput.
Transactional SMS messages are triggered by a user action — such as order confirmations, appointment reminders, two-factor authentication codes, and shipping notifications. Marketing SMS messages are promotional in nature, including sales announcements, discount codes, and campaign blasts. Both types have different compliance requirements, so it's important to obtain proper consent and include opt-out instructions for marketing messages.
Most SMS messages are delivered within seconds. Delivery speed depends on factors like carrier network conditions, message volume, and the type of number you're sending from. Short codes offer the highest throughput, followed by toll-free numbers and 10DLC long codes.
A standard SMS message supports up to 160 characters using GSM-7 encoding. Messages using Unicode characters (such as emojis or non-Latin scripts) are limited to 70 characters. Messages exceeding these limits are automatically split into multiple segments and reassembled on the recipient's device. Each segment counts as a separate message for billing purposes.
Swift SMS Gateway provides the tools and infrastructure to help you stay compliant with TCPA, CTIA, and carrier regulations. This includes support for opt-in and opt-out management, proper message formatting, and campaign registration for A2P messaging. It's your responsibility to obtain proper consent from recipients and follow applicable laws, but our platform is designed to make compliance straightforward.