SMS API vs SMPP: which should you use?
Both send A2P SMS to the same networks on the same routes - the difference is how you connect and how much throughput you need.
REST SMS API
An HTTPS endpoint you POST to. Easiest to integrate (any language, minutes to first message), stateless, great for transactional and most applications. Delivery reports arrive via webhooks. Throughput is high but request-based.
SMPP
A persistent binary protocol connection (a "bind"). Higher sustained throughput and lower per-message overhead, preferred by aggregators, banks and very high-volume senders. Requires a persistent client, IP allow-listing and more operational setup. DLRs return over the same session.
How to choose
Start with the REST API - it covers the vast majority of use cases and is far quicker to ship. Move to (or add) SMPP when you need guaranteed, sustained TPS at scale. With eSMS Africa both reach the same direct routes, so you can start on the API and add an SMPP bind later without changing providers.
FAQ
Is SMPP faster than the API?
SMPP has lower per-message overhead and sustains higher throughput on a single connection, which matters at very high volume. For typical transactional traffic the API is more than fast enough.
Can I use both?
Yes. Many customers send transactional traffic over the API and high-volume campaigns over SMPP, on the same account.