The WhatsApp API for developers. Connect your number, or your clients' numbers, then send and receive from your code, through Meta's official API. Nodium carries the messages, you decide.
npm i @nodium.io/whatsappfor (const id of clients) { await nodium.as(id).messages.send({ to: customer.phone, type: 'template', templateName: 'quote_ready' })}Your brake quote is ready: €240.
ReadYour glasses are ready. When can you come by?
ReadYour viewing is confirmed, Thursday at 6 pm.
ReadYour own number, or your clients' numbers: two cases, the same code behind them.
In the console, one key for your account. It shows once; your code keeps it.
consoleSettings · API keysnod_live_7f3e…
headerAuthorization: Bearer $NODIUM_KEY
From the console, at Meta: Facebook, the business name, the phone. Two minutes. Keep the WhatsApp Business app if you like.
Your numberMeta signup · 2 min
webhookchannel.connected+33 6 …
One call to send. Receipts, replies, photos and voice notes come back to your webhook, signed, in order.
POST/messages{ to, type, templateName }
webhookmessage.delivered · message.receivedsigned · in order
One shape of call. The rest is handled: the 24-hour window, Meta-approved templates, retries, number quality.
An approved template, the slots as buttons: the answer comes with one tap, not a phone call.
A prescription, an ID card: the file lands in your webhook, copied on our side, ready for your code to read.
The voice note arrives as an audio file, with its length. Your code listens to it or passes it on.
The invoice where it gets read. Paid sooner.
Optique Sud
on WhatsApp
Every event leaves signed, is retried on failure and can be read again from the event log.
Photos, documents and audio stored and served, referenced by an ID in your sends.
Written once, deployed to each client's WhatsApp account, tracked until Meta approves them.
Everything Nodium emits, numbered: your server picks up from a cursor if it missed a call.
A button opens screens inside WhatsApp: a choice, a date, a confirmation. What your customer enters reaches your webhook, field by field.
Garage Martin
on WhatsApp
{ "event": "message.received", "data": { "reply": { "kind": "flow", "data": { "service": "oil_change", "date": "2026-10-14", "slot": "09:30" } } }}1,240 opted-in contacts promo_automne
38 left out: no consent or opted out
await nodium.as('crm-4187').broadcasts.send({ name: "Soldes d'automne", whatsappTemplateId: template.id, allOptIn: true})A marketing template approved by Meta, all your opted-in contacts or a list: one call, and Nodium sends from a queue, at the pace Meta allows your number.
Each client has its own number and connect link. You act on its behalf with one header, and a single webhook receives everything. Your clients never see a Nodium screen: it is your product.
// 1 · A new client, and its connect linkconst client = await nodium.tenants.create( { externalId: 'crm-4187', name: 'Agence Horizon' }, { connectLink: true })sendToYourClient(client.connectLink.url)// 2 · Act on its behalf: one header, nothing elseawait nodium.as('crm-4187').messages.send({ … })// 3 · One webhook for all your clients, signed, in orderapp.post('/webhooks/nodium', (req, res) => { const { event, external_id, data } = req.body if (event === 'message.received') handle(external_id, data) res.sendStatus(200)})Build is not a trial: no end date, no credit card, and the whole API — webhooks, templates, Flows, broadcasts. A garage's month fits in its 3,000 messages.
Garage Martin
October · Build plan
Messages this month2,620 / 3,000
Amount due€0.00
Messages sent and received. Meta's fees are paid separately, to Meta.
Build
To get started€0 forever
No credit card
Your WhatsApp number, connected by you. No card.
Start for freeLaunch
€19 per month
Connect your clients' numbers, each through its own link. Everything included on Nodium's side.
Connect my clientsEnterprise
Volumes, numbers and retention to measure, with a dedicated contact.
Moving from Build to Launch changes nothing in your code: same key, same webhooks. Meta bills its fees separately, per number. Compare plans
Nodium is built for the GDPR: you remain the controller of your data, we are the processor, and every guarantee can be checked.
Meta's official API
WhatsApp Cloud API
Zero embedded AI
We carry. Your code decides what to say.
Hosted in the European Union
Servers in Paris, the database in Ireland.
A framed processing agreement
The GDPR processing clauses, in our terms.
Adjustable retention
7, 30 or 90 days depending on the plan; less for a client, if you want.
Erasure in one call
A person, their messages and threads, erased through the API.
Consent respected
A broadcast only reaches contacts who agreed.
Encrypted secrets, logged access
AES-256-GCM at rest; every read of a conversation is logged.
One key, one number, one call. Free for your business.