Vesper is a WhatsApp API gateway that provides a simple REST API for sending messages, managing WhatsApp sessions, receiving real-time webhooks, and managing groups. It supports multi-session management and is designed for developers and businesses.

How do I integrate WhatsApp into my app?

With Vesper, you can integrate WhatsApp in 3 steps: 1) Create an app and get your API key, 2) Start a WhatsApp session by scanning a QR code, 3) Send messages using a simple POST request to the REST API.

What is the pricing for Vesper WhatsApp API?

Vesper offers 3 plans: Starter at €29/month (1 app, 2 sessions, 5K messages), Pro at €69/month (3 apps, 10 sessions, 25K messages), and Enterprise at €149/month (10 apps, 50 sessions, 100K messages). All plans include a 7-day free trial.

Does Vesper support multiple WhatsApp numbers?

Yes. Vesper supports multi-session management, allowing you to connect and manage multiple WhatsApp numbers simultaneously. Each session has its own QR code pairing, auto-reconnect, and health monitoring.

Can I receive WhatsApp messages via webhook?

Yes. Vesper provides real-time webhooks for all WhatsApp events including message received, message sent, message delivered, message read, session connected/disconnected, and group events. All webhooks are HMAC-signed for security.

WhatsApp API Comparison 2026

Vesper vs UltraMsg

Two WhatsApp API platforms with different strengths. Compare features, security, pricing, and developer experience.

Feature Comparison

Feature	Vesper	UltraMsg
Starting Price	From €29/month	From $39/month
Message Limits	5,000 - Unlimited / month	Varies by plan
WhatsApp Numbers	1 - 10 per plan	1 per instance
Setup Time	Under 5 minutes	5-10 minutes
API Quality	RESTful with full documentation	REST API available
Webhook Support	HMAC-signed, auto retry	Basic webhook support
Webhook Security	HMAC-SHA256 signatures	No signature verification
Multi-session	Up to 10 sessions per account	1 session per instance
Analytics Dashboard	Built-in with export	Basic stats
Team Members	Supported (Pro+)	Not available
Role-based Access	Full RBAC	Single user
Support	Email to Dedicated	Email support

Pros & Cons

Vesper

Advantages

Multi-session support in a single account
HMAC-signed webhooks for security
Team members with role-based access
Full analytics dashboard with export
Competitive EUR pricing
Auto-reconnect and health monitoring

Limitations

Newer platform
Smaller community
No free tier (7-day trial instead)

UltraMsg

Advantages

Established WhatsApp API provider
Simple setup process
Multiple programming language examples

Limitations

One session per instance (need multiple accounts for multiple numbers)
No webhook signature verification
No team member support
Limited analytics
No role-based access control
Higher starting price in USD

The Verdict

Vesper offers stronger security (HMAC webhooks), better multi-session support, team collaboration features, and lower EUR pricing. UltraMsg is a simpler option but lacks the security and scalability features that production applications require.

Migrating from UltraMsg to Vesper

Switching to Vesper is straightforward. Follow these steps:

Replace UltraMsg API endpoint URLs with Vesper API endpoints.

Update authentication headers to use Vesper API key format.

Configure webhooks with HMAC signature verification for added security.

Scan the QR code to connect your WhatsApp number.

Test all message types (text, media, documents) before switching production traffic.

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