NexaTelix
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07 / Developers

One API, four channels.

Send RCS, SMS, WhatsApp and Telegram through the same JSON endpoint. Change the channel field, keep the rest of your code.

Get an API keyRead the docs

Authentication

Create a key in your panel under Settings → API keys and send it as a bearer token. Keys are shown once; store them as a secret.

Authorization: Bearer nx_live_••••••••••••••••

Send a message

The cost is debited from your wallet when the campaign is accepted. If your balance is too low, the request fails with 402.

curl https://api.nexatelix.com/v1/messages \
  -H "Authorization: Bearer $NX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "channel": "rcs",
    "to": ["+919812345678"],
    "fallback": "sms",
    "card": {
      "title": "Order A1029 has shipped",
      "text": "Arriving Monday between 2 and 4 PM.",
      "media": "https://cdn.example.com/parcel.jpg",
      "buttons": [{ "text": "Track parcel", "url": "https://example.com/t/A1029" }]
    },
    "replies": ["Change address", "Talk to us"]
  }'

Endpoints

POST/messages

Send to one or many recipients on any channel.

GET/campaigns/{id}

Status, counts and cost for a campaign.

GET/campaigns/{id}/report

Per-recipient delivery report as CSV.

GET/balance

Current wallet balance in USD.

GET/prices

Your rate card, per channel and route.

Webhooks

Set a webhook URL in your panel to receive a status event for every recipient. Verify the signature header with your webhook secret.

POST https://your-app.com/webhooks/nexatelix
X-Nexatelix-Signature: t=1759500000,v1=5f2b…

{
  "event": "message.status",
  "campaign_id": "cmp_8fK2q",
  "to": "+919812345678",
  "channel": "rcs",
  "status": "read",            // queued | sent | delivered | read | failed
  "fallback_used": false,
  "at": "2026-10-03T14:11:09Z"
}

Errors & limits

400Invalid request. The response body names the field.
401Missing or revoked API key.
402Wallet balance is too low for this campaign.
429Rate limit reached: 20 requests per second per key.

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