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 Twilio

Both platforms offer WhatsApp API access, but with very different approaches. Compare pricing, features, and developer experience.

Feature Comparison

Feature	Vesper	Twilio
Starting Price	From €29/month (flat)	Pay-per-message ($0.005+/msg)
Message Limits	5,000 - Unlimited / month	Unlimited (pay per message)
WhatsApp Numbers	1 - 10 per plan	1+ (separate cost each)
Setup Time	Under 5 minutes (QR scan)	1-3 days (Meta Business verification)
API Quality	Simple REST API, instant setup	Comprehensive but complex API
Webhook Support	HMAC-signed, auto retry	Webhook support available
Multi-session	Built-in multi-device	Per-number configuration
Media Support	Images, video, audio, docs	Images, video, audio, docs
Dashboard	Full analytics dashboard	Twilio Console
Minimum Commitment	None, cancel anytime	None, pay-as-you-go
Billing Model	Flat monthly subscription	Per-message + monthly fees
Support	Email to Dedicated	Email / paid support plans

Pros & Cons

Vesper

Advantages

Predictable flat pricing — no surprise bills
Setup in under 5 minutes with QR code
Simple, clean REST API
Built-in multi-device session management
HMAC-signed webhooks with auto retry
No Meta Business verification required

Limitations

Smaller ecosystem compared to Twilio
No SMS/voice — WhatsApp only
Newer platform

Twilio

Advantages

Mature, well-established platform
Multi-channel (SMS, voice, email, WhatsApp)
Large developer community
Official WhatsApp Business API partner

Limitations

Per-message pricing can get expensive at scale
Complex setup requiring Meta Business verification
Steeper learning curve
Support costs extra on lower tiers
Unexpected costs from conversation-based pricing

The Verdict

Vesper is the better choice if you want predictable pricing, fast setup, and a focused WhatsApp-only API. Twilio excels for multi-channel communication needs but comes with higher complexity and potentially higher costs for WhatsApp-heavy workloads.