</>SMS Gateway

Direct-Carrier
SMS Gateway.

Connect your applications to mobile networks over direct Tier-1 routes. Send and receive SMS through REST and SMPP — built for reliable global delivery.

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api.softtop.tech
# Send an SMS over the REST API
$ curl -X POST https://api.softtop.tech/v1/messages \
-H "Authorization: Bearer ••••" \
-d '{
"to": "+14155550142",
"from": "Softtop",
"text": "Your verification message"
}'
← 202 Accepted
{ "id":"sm_9f2c…", "status":"queued", "route":"tier1-direct" }
gateway connected · tier-1 direct
< 2s
// the basics

What is an SMS gateway?

The bridge between your software and mobile networks. Your app sends a message; the gateway translates it into the carrier protocol, routes it through the SMSC, and delivers it — replies travel back the same way.

Your App
CRM · website · backend
SMS Gateway
REST / SMPP
SMSC
Carrier message center
Handset
Recipient

← replies travel the same path in reverse

// architecture

How the Softtop SMS gateway works.

Most providers route through aggregators — multiple hops that add latency and risk. Softtop connects direct to Tier-1 carriers: fewer hops, faster delivery, reputation you own.

RESOLD AGGREGATOR CHAIN
App›
Aggregator›
Reseller›
Aggregator›
Carrier
More hops · higher latency · filtering risk
SOFTTOP DIRECT
App›
Softtop Gateway›
Tier-1 Carrier
Fewer hops · lower latency · controlled reputation
REST API

A developer-friendly HTTPS interface for sending and receiving messages, checking delivery status, and managing numbers.

IDEAL FOR:Apps, websites, CRM integrations
POST /v1/messages
Authorization: Bearer ••••
SMPP

A persistent binary connection for high-throughput, carrier-grade messaging that sustains large, continuous volumes.

IDEAL FOR:Platforms, aggregators, high volume
bind_transceiver
submit_sm  →  deliver_sm (DLR)
// capabilities

Key features of the gateway.

01
Direct carrier routing

Tier-1 interconnects and least-cost routing for high delivery rates and low latency — not a resold aggregator stack.

02
Dual SMPP + REST

Carrier-grade binding for sustained volume, plus a simple REST API for fast integration.

03
Global reach

Messaging across 150+ countries with number inventory in 100+ countries, from one dashboard.

04
Two-way messaging

Send and receive, so applications handle replies, confirmations, and opt-outs programmatically.

05
Real-time delivery receipts

Track status per message for accurate reporting and reliable retry logic.

06
High throughput

Provisioned for sustained, high-volume sending without throttling your traffic.

07
Built-in security

Encrypted transport, real-time fraud detection, and STIR/SHAKEN attestation across the wider network.

// use cases

Common use cases.

A reliable SMS gateway underpins messaging across nearly every industry.

Authentication

One-time passcodes (OTP) and two-factor authentication (2FA) that must arrive instantly.

Transactional alerts

Order confirmations, payment receipts, shipping and delivery updates, and fraud notices.

Notifications & reminders

Appointment reminders, account alerts, and service or outage notifications.

Two-way conversations

Support, surveys, and confirmations where customers reply and your system responds.

Programmatic campaigns

Event-triggered messaging fired straight from your CRM, app, or backend.

// why softtop

Why choose Softtop as your SMS gateway provider.

Delivery, reach, and easy integration — built to win on all three.

01

Deliverability

Tier-1 direct routes — fewest hops, highest delivery rate.

02

Reach

100+ country number inventory, managed from one account.

03

Integration

REST or SMPP — connect in minutes, scale without limits.

USE CASES

Every industry that depends on message delivery.

One gateway, one integration — handling the messaging workflows your platform relies on.

01
Fintech & Banking

OTP codes, transaction alerts, and account notifications delivered with sub-second latency at any volume.

OTP / 2FATransaction alertsAccount notifications
02
Logistics & Delivery

Real-time shipment tracking, delivery window alerts, and exception notices keep customers informed at every step.

Shipment trackingDelivery alertsException notices
03
Healthcare

Appointment reminders, patient notifications, and lab result alerts sent reliably through a compliant gateway.

Appointment remindersPatient alertsLab results
04
SaaS Platforms

Usage threshold alerts, billing notifications, and product updates triggered by your application events via API.

Usage alertsBilling noticesProduct updates
05
E-commerce

Order confirmations, shipping updates, and return status messages sent automatically at every stage of the order.

Order confirmationsShipping updatesReturn status
06
Telcos & CPaaS

High-throughput A2P routing over SMPP or REST for aggregators and platforms that need carrier-level reliability.

A2P routingSMPP / RESTBulk throughput
FAQ

SMS gateway — frequently asked questions.

Connectivity, protocols, coverage, and security for Softtop's direct-carrier SMS gateway.

An SMS gateway is the bridge between your software and mobile carriers. It translates your application's send request into the protocol carriers use and routes it through the SMSC to the recipient's handset — and routes replies back. Softtop's SMS gateway does this over direct Tier-1 interconnects across 150+ countries.
Two ways: a REST API over HTTPS for quick application and CRM integrations, or an SMPP binding for high-throughput, carrier-grade messaging. Both reach the same network and number inventory.
The gateway is the underlying infrastructure that connects to carrier networks; the SMS API is the developer interface you use to access it. Softtop provides both — a REST/SMPP interface on top of a direct-carrier gateway.
Yes. You can send and receive messages programmatically, so your applications can handle replies, confirmations, and opt-outs in real time.
Softtop routes messaging across 150+ countries, with number inventory in 100+ countries, all over direct Tier-1 interconnects from 70+ global Points of Presence.
Direct carrier routing with least-cost routing means fewer hops and a sender reputation you control, while real-time delivery receipts let you track status and build retry logic. The network is backed by 99.999% guaranteed uptime and automated failover.
Yes. Traffic uses encrypted transport, the network applies real-time fraud detection, and STIR/SHAKEN attestation runs across the wider Softtop platform.

Ready to connect your applications to mobile networks worldwide?

Direct Tier-1 routing. SMPP + REST. 150+ countries. 99.999% uptime.

Get Started →Pricing →