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WhatsApp API · REST

A WhatsApp API you can plug into your system in one afternoon

Send and receive text, PDF, images, audio, buttons and lists with a single REST call. Inbound and status webhooks, examples in PHP, Node, Python, C# and Delphi — and the option of an official Meta number without facing the red tape.

Try it free for 2 days View the API reference

No credit cardNo lock-in contractUnlimited messages for US$ 19 per number/monthConnects via QR code in minutes

POST /api/WhatsGw/Send
$ curl -X POST https://app.whatsgw.com.br/api/WhatsGw/Send \
  -H "Content-Type: application/json" \
  -d '{
    "apikey": "YOUR_APIKEY",
    "phone_number": "15550100000",
    "contact_phone_number": "15550100001",
    "message_custom_id": "order-4821",
    "message_type": "text",
    "message_body": "Hi Marina! Your order 4821 shipped today 🚚",
    "check_status": 1
  }'
response{ "result": "success", "result_message": "…" }
Hi Marina! Your order 4821 shipped today 🚚
1 endpointfor text, media, buttons, lists and templates — /WhatsGw/Send
up to 1,000messages per call with /WhatsGw/SendBulk, mixing types
webhookfor inbound messages and status: your system knows when it was delivered and when it was read
5 languagesready-made examples in PHP, Node, Python, C# and Delphi — no SDK required
What the API does

Everything WhatsApp does, now from your code

Notifications, billing, confirmations, customer service, groups — the same number your team uses, driven by your ERP, CRM, SaaS or automation.

Send any type of message

Formatted text, images, PDF, audio, video, location, contacts, buttons and interactive lists. Media by URL or base64.

Example: an invoice PDF with the caption “Due on the 10th” and an “I’ve paid” button.

Receive in real time

Messages, media, reactions and delivery/read status arrive at your webhook. Prefer to query? There’s event polling.

Example: the customer replies “1” → your system opens the ticket and confirms instantly.

Groups and contacts

Create groups, add and remove participants, generate invite links, change name and description. Look up chats, profiles and metadata.

Example: a new class at school → group created and students added automatically.

Official API templates

Create, submit for approval and sync the status of Meta templates through the API itself — without opening Business Manager.

Example: an “order shipped” template approved and sent through the same endpoint.

Instances and numbers

Create and manage instances through the API, restart, update and connect via QR code. No limit on numbers per account.

Example: your SaaS provisions a new number for every customer who subscribes.

No code, if you prefer

Zapier, Make, n8n, Typebot and WooCommerce already talk to WhatsGW. Good for validating before you write code.

Example: order paid in WooCommerce → confirmation on WhatsApp, without a single line of code.
/WhatsGw/Send/WhatsGw/SendBulk/WhatsGw/GetTemplates/WhatsGw/NewTemplate/WhatsGw/CreateGroup/WhatsGw/GroupParticipantsUpdate/WhatsGw/GetAllChats/WhatsGw/GetProfile/WhatsGw/NewInstance/WhatsGw/GetBase64
Official or QR code?

You don’t have to decide this today — and the choice is per number

Start with a QR code in minutes to validate the integration. When it makes sense, connect the official number through Meta’s popup — in minutes, in the same dashboard, with the same API. See the official API.

Flexible · QR code

To start right now

  • Connects like WhatsApp Web: scan the QR code and you’re live
  • No approval, no templates, no per-conversation fee
  • Unlimited messages for US$ 19 per number/month
  • Ideal for validating, for secondary numbers and for customer service
Official · Meta Cloud API

To scale with an official Meta number

  • Number on Meta’s Cloud API, with a lower risk of being blocked
  • Connects through Meta’s popup with the number already on WhatsApp Business — without removing it from the phone
  • Same endpoint, same webhook — only the number changes
  • Recommended for notifications at scale and main channels
View the official API
Developer experience

Living docs, examples that actually run and support from people who have done hundreds of integrations

  • POST or GET on the methods, JSON or form-urlencoded — whatever your stack already does.
  • Async result with check_status: the delivery result arrives at your webhook, with your message_custom_id to match it to the order.
  • Examples in PHP, Node, Python, C# and Delphi, ready to paste.
  • Typing simulation, message editing and deletion, chat clearing.
  • Technical support via WhatsApp for integration, internal validation and operation at scale.
Open the API reference (OpenAPI)
PHPNode.jsPythonC#Delphicurl
Webhook · event received
message_statusPOST to your endpoint
{ "message_custom_id": "order-4821", "status": "read", "contact_phone_number": "15550100001" }
✓ delivered 09:41✓✓ read 09:43
How it works

From sign-up to your first message in four steps

Create your account

Free 2-day trial, no credit card. Your API key is in the dashboard.

Connect a number

QR code, just like WhatsApp Web. In minutes the instance is online.

Make your first POST

Copy the example from the docs, swap in your API key and the phone number. Delivered.

Point your webhook

Receive messages and statuses at your endpoint and close the loop in your system.

Predictable pricing

Per number, no message limit. Or per message, if you prefer.

Prepaid, no lock-in, no setup fee. Over 25 numbers, special terms.

  • US$ 19 per number/month, unlimited messages
  • Or per message, tiered: from R$ 0,120 (≈ US$ 0.023) to R$ 0,023 (≈ US$ 0.0044) depending on volume
  • API, webhooks, groups, templates and team inbox included
  • Official Meta connection available
US$ 19 per number/month

unlimited messages · no lock-in

Billed in Brazilian reais (R$ 99) via PayPal; your bank converts to your currency.

Try it free for 2 days
See all plans
FAQ

What developers ask before integrating

Do I need Meta’s official API to use it?

No. You connect a number via QR code in minutes and start integrating. The official connection (Meta Cloud API) is available per number, whenever you want: you connect it yourself through Meta’s popup, in minutes — see the official API.

What message types can I send?

Formatted text, images, PDF and other documents, audio, video, location, contacts, buttons, interactive lists and, on the official number, approved templates. Media can be sent by URL or base64.

How do I know whether a message was delivered and read?

Send with check_status and set up your webhook: statuses arrive at your endpoint with the message_custom_id you defined. You can also query via event polling.

POST or GET?

Both. GET is limited by URL length — for media and large messages, use POST with JSON or form-urlencoded.

Can I send in bulk?

Yes: /WhatsGw/SendBulk accepts up to 1,000 messages per call, mixing text, media and buttons. For campaigns from the dashboard, see bulk messaging.

Is there an SDK?

It isn’t required — it’s plain REST. The docs include ready-made examples in PHP, Node, Python, C# and Delphi, and the collection can be imported into Postman.

How much does it cost?

US$ 19 per number/month with unlimited messages, or per message in tiers from R$ 0,120 (≈ US$ 0.023) to R$ 0,023 (≈ US$ 0.0044) depending on volume. Prepaid, no lock-in, no setup fee. Over 25 numbers, special terms. Billed in Brazilian reais (R$ 99) via PayPal; your bank converts to your currency.

What if I also want human agents?

The same number can be used by your team in the team inbox and by the AI agent — API, human support and AI in one place.

Send your first message today

Create your account, connect a number via QR code and copy the example from the docs. No credit card, no lock-in — and with technical support via WhatsApp.

Try it free for 2 daysView the API reference
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