Quickstart

Send your first SMS in three steps.

1. Get an API token

Create a scoped key from your dashboard.

From your dashboard go to Settings → API Keys & Webhooks and create a token. Copy it immediately, it is shown only once. Tokens carry scopes (abilities) that limit what they can do, see Authentication.

2. Send a message

One POST puts a campaign in the queue.

POST /sms/sendsms:send

Send to one or more recipients from an approved sender ID. Pass an Idempotency-Key so a retry never double-sends.

curl -X POST https://api.helliomessaging.com/v1/sms/send \
  -H "Authorization: Bearer YOUR_API_TOKEN" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
    "recipients": ["+233241234567"],
    "sender": "HELLIO",
    "message": "Hello from Hellio!"
  }'

const res = await fetch("https://api.helliomessaging.com/v1/sms/send", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.HELLIO_API_KEY}`,
    "Content-Type": "application/json",
    "Idempotency-Key": crypto.randomUUID(),
  },
  body: JSON.stringify({
    recipients: ["+233241234567"],
    sender: "HELLIO",
    message: "Hello from Hellio!",
  }),
});
const { data } = await res.json();

import os, uuid, requests

res = requests.post(
    "https://api.helliomessaging.com/v1/sms/send",
    headers={
        "Authorization": f"Bearer {os.environ['HELLIO_API_KEY']}",
        "Idempotency-Key": str(uuid.uuid4()),
    },
    json={
        "recipients": ["+233241234567"],
        "sender": "HELLIO",
        "message": "Hello from Hellio!",
    },
)
data = res.json()["data"]

use Illuminate\Support\Facades\Http;

$data = Http::withToken($apiKey)
    ->withHeaders(['Idempotency-Key' => (string) Str::uuid()])
    ->post("https://api.helliomessaging.com/v1/sms/send", [
        'recipients' => ['+233241234567'],
        'sender' => 'HELLIO',
        'message' => 'Hello from Hellio!',
    ])
    ->json('data');

A 202 Accepted means the campaign is queued:

{
  "data": {
    "reference": "8f3a...",
    "campaign_id": 1042,
    "status": "queued",
    "accepted_recipients": 1,
    "invalid_recipients": 0,
    "segments": 1,
    "estimated_cost": "0.0300",
    "currency": "GHS"
  }
}

3. Check delivery

Confirm what happened to your message.

Fetch the campaign summary, or a single message by its reference:

curl https://api.helliomessaging.com/v1/campaigns/8f3a... \
  -H "Authorization: Bearer YOUR_API_TOKEN"

Response:

{
  "data": {
    "reference": "8f3a...",
    "campaign_id": 1042,
    "status": "completed",
    "recipients": 1,
    "estimated_cost": "0.0300",
    "charged": "0.0300",
    "breakdown": { "delivered": 1 }
  }
}

For real-time updates instead of polling, set up a webhook.

Recipients format

How to pass one number or many.

recipients accepts an array, or a single comma / newline separated string. Numbers may be written in local (0241234567) or international (+233241234567) form, spaces are ignored.

Other channels

The same credentials power OTP, voice, lookup and email.

The same token + base URL power OTP (/otp/send, /otp/verify), voice (/voice/send), number lookup (/lookup) and email verification (/email/verify). See the API Reference for every endpoint.