When connecting to an SMS provider, most businesses choose between an HTTP-based REST API and SMPP (Short Message Peer-to-Peer), the long-established telecom protocol for exchanging SMS traffic.
HTTP / REST API
A REST API lets your application send a message with a standard HTTPS request. It's familiar to most developers and quick to integrate into web and mobile backends.
- Simple to implement with any programming language
- Well suited to application-triggered and transactional messages
- Delivery status usually reported via webhooks
SMPP
SMPP maintains a persistent connection (a “bind”) between systems. It is widely used by aggregators, carriers and platforms that send higher volumes or already operate SMS gateways.
- Persistent sessions suited to sustained throughput
- Native delivery receipt handling
- Common in wholesale and carrier-to-carrier exchange
How to decide
If you're a product team adding OTPs or notifications, an HTTP API is usually the faster path. If you're an aggregator, reseller or platform with an existing SMPP client, protocol-level connectivity is often the natural fit.
Whichever you choose, plan for sender ID rules and content requirements that vary by destination country.