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Reliable SMS API for Developers & Businesses

Multi-channel messaging via SMS, RCS, and WhatsApp. Programmable APIs built for quick and effective communication with your customers.

WHY QUICKSMS

Smartphone displaying QuickSMS app with annotations highlighting features such as branded sender, pictures and videos, 3200 characters, reply buttons, read receipts, and a sample message reading 'Can't wait to hear more'.

Built for Developers

Build fast with developer-first APIs for SMS, RCS, and WhatsApp. Test in a secure sandbox, deploy with clean code libraries, and track everything via webhooks and real-time analytics. Designed to keep you building and not troubleshooting

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Screenshot of a code snippet representing a POST request to a URL, with headers and JSON data containing patient information such as reference ID, CID, MSISDN, and timestamp.

A man wearing red glasses, a red beanie, a light blue shirt, and jeans, holding a closed silver laptop.

A computer screen displaying a JSON API request for a POST method to the URL 'https://www.quicksms.com/seen-receipts', with headers and JSON data including 'reference', 'CID', 'MSISDN', and 'seentime' fields.

QuickSMS provides fully open, developer-friendly API documentation.

No login required.

You'll find clear authentication steps, sample requests and responses, error codes, and integration guides for SMS, RCS, and WhatsApp Business.

Our docs are designed to help developers send their first message in minutes, with language-specific examples and real-world use cases.
Get started fast with QuickSMS.
Sign up, generate your API key, and send your first SMS or WhatsApp message in just a few minutes.

Our streamlined onboarding process, sandbox environment, and copy-paste code samples reduce setup friction and get you building faster.
QuickSMS offers a secure sandbox environment to help you test API requests without sending live messages or incurring costs.

Use the sandbox to simulate SMS, RCS, and WhatsApp messaging flows, validate your payloads, and ensure everything works before going live.

It's ideal for developers building applications that require high confidence in delivery and behaviour.
Handling mission critical messaging with complete failover and the power to process millions of requests 24 hours per day 7 days per week. Handling up-to 70,000 API requests per second

API Documentation

QuickSMS’ SMS API in Action

Send Transactional SMS

Send OTPs, alerts, or confirmations instantly through our secure API. Perfect for banks, healthcare, and logistics.

POST /send
{
  "MSISDN": "447123456789",
  "msg": "Your code is 845712",
  "sender": "QuickSMS"
}

Two-Way Messaging

Enable customer replies and manage conversations with your team or CRM using our reply endpoints.

GET /incoming
{
"MSISDN": "447987654321",
"Message": "Yes, I’m available"
}

Delivery & Seen Receipts

Track when your message was delivered, read, or failed – with webhook support for real-time updates.

POST /delivery-report
{
"status": "Delivered",
"timestamp": "2025-10-14 12:05:00"
}

Schedule SMS Messages

Plan messages for future delivery — perfect for appointment reminders or time-sensitive campaigns.

POST /send
{
  "MSISDN": "447123456789",
  "msg": "Your appointment is tomorrow at 3pm",
  "sender": "QuickSMS",
  "schedule": "2025-10-15 14:00:00"
}

Bulk & Long Message Support

Send high volumes with support for multipart messages. Perfect for promotions or bulk notifications.

POST /send
{
  "MSISDN": ["447123456789", "447987654321"],
  "msg": "Thank you for joining our Autumn sale – enjoy 15% off this weekend!",
  "multi": true
}

One-Time PINs (OTP)

Secure logins, account verification, and 2FA via OTPs using our fast and compliant SMS API.

POST /send
{
  "MSISDN": "447111222333",
  "msg": "Your one-time passcode is 783219",
  "sender": "SecureLogin"
}

API Documentation

Reliable SMS API for Developers & Businesses

Built for Developers