WhatSyncs is launching with 3 WhatsApp connections free. Start Free →
Developers
If you have built a WhatsApp integration before, you know the shape of the work: two days on the feature, three weeks on sessions dropping, media URLs expiring and the same message arriving through three different paths.
The part your product needs — take a message, write it somewhere — is usually a few hundred lines. Everything around it is the expensive part: keeping sessions alive, detecting when they are not, catching up after a reconnect without duplicating, and downloading media before its URL expires.
None of that is specific to your product. Every team that builds it, builds the same thing, badly the first time.
Predictable JSON, explicit error codes, cursor pagination and idempotency keys. These are not features so much as the absence of surprises, which is what you actually want from infrastructure.
Once events are reliable, the work becomes product work: routing, enrichment, automation, analytics — decisions specific to what you are building rather than to WhatsApp.
How it helps
Predictable JSON, explicit error codes, cursor pagination and idempotency keys. These are not features so much as the absence of surprises, which is what you actually want from infrastructure.
In practice
Once events are reliable, the work becomes product work: routing, enrichment, automation, analytics — decisions specific to what you are building rather than to WhatsApp.
Not required. The API is plain HTTPS and JSON with bearer authentication, which every language handles natively — an SDK would mostly be a wrapper around fetch.
Point the webhook at a tunnel to your machine during development, then swap it for your production endpoint. Delivery logs show every attempt with the response your endpoint gave, which makes local debugging straightforward.
The delivery is retried with backoff and recorded as failed in the delivery log. Retries carry the same idempotency key, so once you recover you can process them safely.
FAQ
Yes. WhatSyncs is built API-first: authenticated REST endpoints for messages, conversations, media and connections, plus signed webhooks with retries and idempotency keys so events can be processed safely.
Yes. You can send messages from any connected number with an authenticated REST call, which means your CRM, helpdesk or internal application can send from the same number your team uses.
Every message carries a stable identifier, and WhatSyncs reconciles messages seen through real-time events, reconnects and history synchronization against it. Webhook deliveries also carry an idempotency key so a retry does not create a second record in your CRM.
Yes. Incoming and outgoing messages, message status updates and connection events are delivered to your endpoint as they happen. Payloads can be signed so your systems can verify that an event originated from WhatSyncs, and failed deliveries are retried.
Start with up to 3 WhatsApp connections and 1,000 active chats per month. No credit card required.