---
title: "SMS"
method: POST
path: "/v1/messages/send"
tags: ["Suprsonic"]
---

# SMS

`POST /v1/messages/send`

## Request

- Base URL: `https://suprsonic.ai`
- URL: `https://suprsonic.ai/v1/messages/send`
- Auth: HTTP bearer

Send SMS or WhatsApp messages. Default channel is SMS (reliable delivery). WhatsApp requires recipient opt-in: they must have messaged your Business number within 24 hours. Returns the message id, channel, recipient, sender number and send status. Sends a real message to a phone number: a sent message cannot be recalled, and every call sends a new one. Use it to text a number the user gave you. Cost: 1 credit, charged only when a call succeeds.

## Request body

- AppApiUnifiedMessagesSendMessageRequest
  - `to` string, required
  - `channel` 'auto' | 'sms' | 'whatsapp'
  - `message` string, required
  - `from_number` string, nullable

## Response `200`

The call's envelope: success, data (the capability's result), metadata, and credits_used (0 when the call did not succeed).

- UnifiedResponse: Standard envelope for all unified API responses.
  - `success` boolean, required
  - `data` union
    - object
    - unknown[]
      - unknown
  - `error` UnifiedError: RFC 7807 problem detail for machine-actionable errors.
    - `type` string, required
    - `title` string, required
    - `status` integer, required
    - `detail` string, nullable
    - `is_retriable` boolean
    - `retry_after_seconds` integer, nullable
    - `alternative_action` string, nullable
    - `error_category` string
    - `caller_error` string, nullable
  - `metadata` UnifiedMetadata: Metadata included in every unified API response.
    - `provider_used` string, nullable
    - `providers_tried` string[]
    - `mode_used` string, nullable
    - `response_time_ms` integer
    - `request_id` string
    - `capability` string, nullable
    - `params` object, nullable
  - `credits_used` integer

## Other responses

- `401`: No API key, or one that was not found or is revoked.
- `402`: Not enough credits for this call. The error's alternative_action says where to add them.
- `403`: The account is restricted by a billing issue.
- `422`: Validation Error
- `429`: The key's rate limit is reached. The error's retry_after_seconds says when to try again.

---

[API](https://skmtc.dev/o-mega/apis/suprsonic-api.md) - [All operations](https://skmtc.dev/o-mega/apis/suprsonic-api/llms.txt) - [OpenAPI document](https://skmtc.dev/o-mega/apis/suprsonic-api/revisions/0eb535eb5679?raw)