# WhatIsUp.dev

> Developer-first WhatsApp gateway. One pair, full primitive surface — messages, groups, contacts, chats, business catalogs, stories, newsletters, presence, calls. REST + signed webhooks. Stateless where it can be, stateful where it must.

WhatIsUp is built for agents and humans equally. Every endpoint is described in a single OpenAPI 3.1 spec. Webhooks are HMAC-SHA256 signed (Stripe-style). API keys are Bearer tokens prefixed `zpk_live_` or `zpk_test_`.

## Quickstart

1. Create an account: https://app.whatisup.dev/signup
2. Issue an API key from the dashboard.
3. Create a channel: `POST https://api.whatisup.dev/v1/channels`
4. Pair via QR (`GET /v1/channels/{id}/qr`) or pairing code (`POST /v1/channels/{id}/pair-code`).
5. Send a message: `POST /v1/channels/{id}/messages` with `{ "type": "text", "to": "+1...", "text": "hi" }`.
6. Receive inbound traffic by registering a webhook: `POST /v1/webhook-endpoints`.

## Machine-readable spec

- OpenAPI 3.1 (canonical): https://api.whatisup.dev/openapi.json
- OpenAPI mirror (CDN): https://whatisup.dev/openapi.json
- Full LLM-optimized context: https://whatisup.dev/llms-full.txt

## Docs

- [Overview](https://whatisup.dev/docs)
- [Quickstart](https://whatisup.dev/docs/quickstart)
- [Authentication](https://whatisup.dev/docs/authentication)
- [API reference](https://whatisup.dev/docs/api)
- [Webhooks](https://whatisup.dev/docs/webhooks)
- [Errors](https://whatisup.dev/docs/errors)
- [Rate limits](https://whatisup.dev/docs/rate-limits)
- [Idempotency](https://whatisup.dev/docs/idempotency)
- [SDKs](https://whatisup.dev/docs/sdks)
- [WhatsApp capability matrix](https://whatisup.dev/docs/whatsapp)
- [Changelog](https://whatisup.dev/docs/changelog)

## Optional

- [Pricing](https://whatisup.dev/pricing)
- [Status](https://whatisup.dev/status)
- [Contact](https://whatisup.dev/contact)