---
title: "Send MKT/TXN/OTP SMS using POST method to multiple numbers"
method: POST
path: "/v1/{sid}/messages"
tags: ["Bulk SMS APIs"]
---

# Send MKT/TXN/OTP SMS using POST method to multiple numbers

`POST /v1/{sid}/messages`

## Request

- Base URL: `api.in.kaleyra.io` (relative, and the document’s source URL is not known)
- URL: `api.in.kaleyra.io/v1/{sid}/messages`
- Auth: none declared. Required headers: `api-key`, `Content-Type`

To send marketing messages use "type" value as "MKT".
To send transactional messages use "type" value as "TXN".
To send otp messages use "type" value as "OTP".
To send SMS to multiple numbers use Comma separated values in "to"

## Path parameters

- `sid` string, required

## Headers

- `api-key` string, required
- `Content-Type` string, required

## Request body `application/x-www-form-urlencoded`

- object
  - `to` string, required: It contains a phone number, Numbers Separated by “,“ comma OR It can have a list of numbers in an Array. For example - 9188XXXXXXXX.
  - `sender` string, required: Sender ID used for sending SMS. The sender must be in the form of a tag when used in template-based sending. For example - "KLRHXA"
  - `type` string: Type of the SMS (for example, transactional). `type` must exist as a tag if using template-based sending.
  - `template_id` string: [Conditional] Template ID for pre-registered templates. Required if the body is not provided. `template_id` must be 12 to 30 digits and exist as a tag.
  - `body` string: [Conditional] Body of the SMS. It is required if template_id is not provided.
  - `callback_profile_id` string: URL for callbacks. Callback must exist as a tag if using template-based sending.
  - `campaign_name` string: Name of the campaign. Must match regex pattern ^[\w-]*$.
  - `ref` string: Custom reference fields for the message, up to 150 characters each.
  - `ref1` string: Custom reference fields for the message, up to 150 characters each.
  - `ref2` string: Custom reference fields for the message, up to 150 characters each.

## Response `200`

Successful response

---

[API](https://skmtc.dev/kaleyra/apis/kaleyra-io-sms-apis.md) - [All operations](https://skmtc.dev/kaleyra/apis/kaleyra-io-sms-apis/llms.txt) - [OpenAPI document](https://skmtc.dev/kaleyra/apis/kaleyra-io-sms-apis/revisions/b7c9b536aa4d?raw)