WhatsApp infrastructure built for developers.
REST + signed webhooks + realtime events. From zero to your first WhatsApp message in under 5 minutes. No Twilio markup. No Meta verification queue.
Three steps from zero to a sent message.
There's no SDK install, no Meta business verification, no markup. Sign up, scan a QR, hit the API.
Pair a channel
Sign up, create a channel from the dashboard, scan the QR with your phone. Same flow as WhatsApp Web — the connection layer keeps the session alive on our side.
Send via REST
POST to /v1/channels/:id/messages with a bearer key. Text, image, document — same JSON shape. The response is immediate; delivery happens async.
React on webhooks
Inbound messages and delivery state arrive at your endpoint with a Stripe-style HMAC signature, retries, and a queryable delivery log.
Infrastructure, not a SaaS chatbot.
WhatIsUp.dev is the layer between your application and WhatsApp. Everything is typed, signed, and observable.
REST API
Channels, messages, webhooks, API keys. JSON in, JSON out. Same Zod schemas the gateway validates against.
Signed webhooks
X-WhatIsUp-Signature: t=…,v1=… verified the same way Stripe does. Automatic retries with exponential backoff.
Realtime SSE
/v1/events streams QR codes and channel state changes. No polling, no WebSocket gymnastics.
Channel lifecycle FSM
pending → qr → connecting → connected → disconnected. Every transition is a typed event.
Zero infrastructure to run
No queue, cache, or database for you to operate. We host the entire gateway — you just call a REST endpoint.
Open contracts
Every request, response, and webhook payload ships as a typed Zod schema. Zero drift.
Many channels, one gateway, automatic fan-out.
Every WhatsApp event flows through Auth → Sessions → EventBus → Dispatcher → HMAC queue and is delivered to all your endpoints with an sha256 signature and a correlationId. You manage zero connections.
Pick a plan, scale when you're ready
Same APIs at every tier. Move up only when your traffic asks for it.
7-day free trial · no credit card
Starter
Solo builders and side projects shipping for real.
7 days free, no credit card
- 1 channel
- Unlimited messages
- 2 API keys
- Signed webhooks with retries
- Realtime event streams
Pro
Production teams running real workflows.
7 days free, no credit card
- 3 channels
- Unlimited messages
- 10 API keys
- Priority email support
- Advanced webhook retries
Stop wiring WhatsApp by hand.
Free trial covers Pro-tier limits for 7 days. Drops to the free plan after — no surprise charges.