Send Message

POST

api.ziett.co/c/v1 /messages

Submit a request to send a single transactional message to a specific recipient. Designed for high-reliability, low-latency programmatic notifications — OTPs, delivery alerts, account events, and other time-sensitive communications that must reach one user immediately.

For sending messages to large audiences, see Send Batch Campaign.

How It Works

Validation — The API authenticates your key, verifies the messages:send scope, and validates all fields.
Routing — The recipient's number is analysed to identify the target carrier network and country.
Pricing — The cost for the specific route and channel is calculated against your plan.
Funds Check — The system verifies your balance is sufficient. If not, the request is rejected with 402.
Queuing — The message is placed in a high-priority delivery queue and dispatched to the carrier or Meta's Cloud API.
Response — 202 Accepted is returned immediately with a message_id to track the lifecycle.

202 Accepted — not 200 OK — is intentional. It means your message has been accepted and queued, not yet delivered. Track final status via webhook or Retrieve Message.

Request

Required scope: apikey:messages:send

Body

Content-Type: application/json

Field	Type	Required	Description
`remitter_id`	`uuid`	✅	UUID of the Sender ID configured in your organization. Determines the sender name or number displayed to the recipient.
`channel_type`	`enum`	✅	Delivery channel. Accepted values: `SMS`.
`target_e164`	`string`	✅	Recipient phone number in E.164 format (e.g., `+244990090990`). Must include the country code.
`content`	`string`	✅	Message body. For SMS, max 1600 characters — multi-part messages are concatenated automatically.
`save_contact`	`object`	❌	If provided, upserts the recipient into your contact list. See Save Contact Object.

Save Contact Object

When included, the recipient is created or updated in your contacts list at send time — useful for building your audience organically from transactional traffic.

Field	Type	Required	Description
`name`	`string`	✅	Full name of the contact.
`email`	`string`	❌	Email address. Must be a valid format.
`tags`	`array[string]`	❌	Tags to assign (e.g., `["Premium", "Angola"]`). Created automatically if they don't exist.

Examples

import httpx

response = httpx.post(
    "https://api.ziett.co/c/v1/messages",
    headers={
        "X-API-KEY": "zk_live_xxxxxxxxxxxxxxxxxxxxxxxxxxxx",
        "Content-Type": "application/json",
    },
    json={
        "remitter_id": "019b4b56-e704-7c30-83a0-527df63c3e00",
        "channel_type": "SMS",
        "target_e164": "+244990090990",
        "content": "Your verification code is 482910. It expires in 5 minutes.",
    },
)

if response.status_code == 202:
    message_id = response.json()["message_id"]
    print(f"Message accepted. Tracking ID: {message_id}")
else:
    print(f"Error: {response.json()}")

curl -X POST https://api.ziett.co/c/v1/messages \
  -H "Content-Type: application/json" \
  -H "X-API-KEY: zk_live_xxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
  -d '{
    "remitter_id": "019b4b56-e704-7c30-83a0-527df63c3e00",
    "channel_type": "SMS",
    "target_e164": "+244990090990",
    "content": "Your verification code is 482910. It expires in 5 minutes."
  }'

const response = await fetch("https://api.ziett.co/c/v1/messages", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "X-API-KEY": "zk_live_xxxxxxxxxxxxxxxxxxxxxxxxxxxx",
  },
  body: JSON.stringify({
    remitter_id: "019b4b56-e704-7c30-83a0-527df63c3e00",
    channel_type: "SMS",
    target_e164: "+244990090990",
    content: "Your verification code is 482910. It expires in 5 minutes.",
  }),
});

const data = await response.json();

if (response.status === 202) {
  console.log("Message accepted. Tracking ID:", data.message_id);
} else {
  console.error("Error:", data);
}

curl -X POST https://api.ziett.co/c/v1/messages \
  -H "Content-Type: application/json" \
  -H "X-API-KEY: zk_live_xxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
  -d '{
    "remitter_id": "019b4b56-e704-7c30-83a0-527df63c3e00",
    "channel_type": "SMS",
    "target_e164": "+244990090990",
    "content": "Welcome to Ziett. Your account is now active.",
    "save_contact": {
      "name": "Carlos David",
      "email": "carlos.david@example.com",
      "tags": ["New Customer", "Angola"]
    }
  }'

Responses

`202 Accepted` — Message Queued

The message has been validated, your account debited, and the message placed in the delivery queue.

{
  "message_id": "019b4b56-e704-7c30-83a0-527df63c3e00"
}

Field	Type	Description
`message_id`	`uuid`	Unique identifier for this message. Store it to retrieve delivery status or correlate with webhook events.

`401 Unauthorized` — Invalid API Key

The X-API-KEY header is missing, malformed, or the key has been revoked.

{
  "code": "AUTH_INVALID_API_KEY",
  "message": "The provided API key is invalid or has been revoked.",
  "status": 401,
  "trace_id": "a1b2c3d4e5f644358a9e7011c123c831",
  "timestamp": "2025-07-14T10:30:00.000000+00:00",
  "service": "core"
}

`402 Payment Required` — Insufficient Funds

Your organization's credit balance is below the cost of this message route.

{
  "code": "BILLING_INSUFFICIENT_FUNDS",
  "message": "Your account balance is too low to process this request. Please top up your credits.",
  "status": 402,
  "trace_id": "c109f78ae57744358a9e7011c123c831",
  "timestamp": "2025-07-14T10:30:00.000000+00:00",
  "service": "billing"
}

`422 Unprocessable Entity` — Validation Error

One or more fields are missing or contain invalid values. The fields object maps each failing field to a specific message.

{
  "code": "VALIDATION_ERROR",
  "message": "One or more fields failed validation.",
  "status": 422,
  "trace_id": "f812a3bc91e044358a9e7011c456d901",
  "timestamp": "2025-07-14T10:30:00.000000+00:00",
  "service": "core",
  "fields": {
    "target_e164": "Must be a valid E.164 formatted phone number (e.g., +244990090990).",
    "channel_type": "Accepted values are: SMS, WHATSAPP."
  }
}

Rate Limits

This endpoint is limited to 120 requests per minute per API Key. See Rate Limits & Reliability for backoff strategies and retry guidance.

Get Message — Get the delivery status of a specific message by message_id.
List Messages — Retrieve paginated history of all messages sent by your organization.
Send Batch Campaign — Send to a large audience in a single request.