EngineeringArchitecture
Building a Scalable WhatsApp API for Africa
How we engineered Uno SAP to handle thousands of messages per minute across unreliable mobile networks — without losing a single session.
May 28, 2025
6 min read
WhatsApp API Platform
The WhatsAppAPI for developers.
Connect any WhatsApp number to your app in minutes. Send messages, receive webhooks, manage sessions — all via a simple REST API.
3-day free trial
No credit card
NGN pricing
<180ms
Average latency
By the numbers
The infrastructure developers trust to deliver messages at scale.
0+Messages sent daily
0+Developers building
0.0%API uptime
<0msAverage latency
How it works
Up and running in 3 steps
From zero to your first API call in under five minutes.
Select a step1 / 3
unosap / step-01
STEP 01
Scan with WhatsApp on your phone
Session connected
EncryptedStableLive
Core Features
Everything you need to send WhatsApp at scale
One clean API. Every message type. All the infrastructure you need to ship fast.
Multi-Session Management
Connect multiple WhatsApp numbers
Each session gets its own API key. Monitor health, reconnect, and manage all from one dashboard.
Sales Line 1
+234 812 xxx xxxx
Support Queue
+234 803 xxx xxxx
Ops Line
+234 701 xxx xxxx
Session health score 0–100 · auto-reconnects on drop
REST API
Simple HTTP API
Send text, images, documents, audio, buttons, lists, and location messages.
Real-Time Webhooks
HMAC-SHA256 signed
Inbound messages, delivery receipts, and session events pushed to your server.
▌
Session Health
Score-based health (0–100)
Automatic reconnection with exponential backoff. Never lose a session silently.
91score
Uptime99.9%
Reconnects2
Last event4s ago
Media Upload
Upload once, send anywhere
Upload images, videos, documents, and audio to cloud storage. Get a URL back.
PDF
invoice.pdf
IMG
product.jpg
AUD
voice.ogg
Returns CDN URL · use in /send payload
Usage & Billing
Real-time usage tracking
Per-plan limits on sessions and daily messages. See exactly how much you've used at any point.
Sessions3 / 10
Messages today3,800 / 5,000
API calls today12,400 / 20,000
Pricing
Simple pricing, serious power
Every plan includes REST API access, real-time webhooks, session health monitoring, media uploads, and dashboard access.
Free
Explore the API during your trial
₦03-day trial
Start free trial- 1 WhatsApp session
- 100 messages / day
- 500 API calls / day
- REST API access
- Real-time webhooks
- Session health monitoring
- Media upload
- Dashboard access
Starter
For developers shipping their first integration
₦0/mo
Get started- 3 WhatsApp sessions
- 1,000 messages / day
- 5,000 API calls / day
- REST API access
- Real-time webhooks
- Session health monitoring
- Media upload
- Dashboard access
- Multiple sessions
Most Popular
Growth
For teams scaling WhatsApp in production
₦0/mo
Get started- 10 WhatsApp sessions
- 5,000 messages / day
- 20,000 API calls / day
- REST API access
- Real-time webhooks
- Session health monitoring
- Media upload
- Dashboard access
- Multiple sessions
- Priority support
Business
For high-volume production workloads
₦0/mo
Get started- 30 WhatsApp sessions
- Unlimited messages / day
- Unlimited API calls / day
- REST API access
- Real-time webhooks
- Session health monitoring
- Media upload
- Dashboard access
- Multiple sessions
- Priority support
Need more sessions or custom terms?
Enterprise plans with SLA, dedicated infrastructure, and volume pricing.
Testimonials
Trusted by developers in production
AB
FINTECH
“We integrated Uno SAP into our loan disbursement system in half a day. The REST API is clean, the webhooks are reliable, and the session health monitoring has been a lifesaver.”
Adeola Bamidele
Backend Engineer at Swiftpay Lagos
Blog
Latest from the Uno SAP team
Engineering deep-dives, product updates, and guides for building with the WhatsApp API.
ComparisonsGuides
WhatsApp Business API vs. Uno SAP REST API: Which Is Right for You?
A practical comparison of the official WhatsApp Business API and the Uno SAP REST API — pricing, setup complexity, features, and developer experience.
May 15, 2025
5 min read
TutorialsBest Practices
Webhook Best Practices for Production WhatsApp Apps
Idempotency, retry strategies, signature verification, and handling edge cases — what every developer should know before going live with WhatsApp webhooks.
Apr 22, 2025
7 min read
Start building in minutes.
Connect your first WhatsApp session, get an API key, and make your first API call — all within your free trial.
3-day free trial
No credit card required
NGN pricing