---
title: "Send an SMS/MMS"
method: POST
path: "/v1/messaging/sms/messages"
tags: ["SMS"]
---

# Send an SMS/MMS

`POST /v1/messaging/sms/messages`

## Request

- Base URL: `https://apihub.co.il`
- URL: `https://apihub.co.il/v1/messaging/sms/messages`
- Auth: HTTP bearer

Sends an SMS (or MMS when `mediaUrls` is set) from one of your
SMS-enabled numbers. At least one of `text` / `mediaUrls` is required.
Both numbers are normalized to E.164, so `from` matches regardless of
formatting and replies thread into the same inbox conversation.

US numbers must have an approved carrier registration
(`/v1/sms/registrations`) before messages deliver.

**Replies and delivery status arrive as webhooks**, not by polling:
an inbound reply fires `message.received` with `platform: "sms"`, the
first message of a new thread also fires `conversation.started`, and
this message's own outcome fires `message.delivered` or
`message.failed` (the latter carrying the carrier's error code).

**Opted-out recipients:** a send to a number that replied STOP is
refused with `409`, never silently dropped.

**Idempotency:** send an `Idempotency-Key` header to make retries safe:
same key + same body replays the original response instead of sending a
second message; same key + different body returns 422; a key still in
flight returns 409.


**Billing:** Request; paid actions are priced in credits (see GET /v1/messaging/prices) · **Rate limit:** 60/min

## Headers

- `Idempotency-Key` string
- `X-Tag` string

## Request body

- object
  - `to` string, required: Recipient number (E.164).
  - `from` string, required: One of your SMS-enabled numbers (E.164; formatting is normalized).
  - `text` string: Message body. Required unless `mediaUrls` is set. Max 10 SMS segments (1530 GSM-7 or 670 unicode characters).
  - `sendAt` string, date-time: Optional. Schedule the send for a future time (ISO 8601 with offset, e.g. `2026-08-01T12:00:00Z`). Must be in the future. The message is queued and the `message.delivered` webhook fires when it actually sends.
  - `mediaUrls` string[]: Public media URLs to attach (sends as MMS). Max 10.

## Response `200`

Completed

- object
  - `id` string: Execution id — stable across internal retries; use it with GET /v1/executions/{id}
  - `status` 'pending' | 'processing' | 'completed' | 'partial' | 'failed' | 'cancelled' | 'timeout'
  - `operation` string
  - `tag` string, nullable: Your X-Tag, if sent
  - `created_at` string, date-time
  - `completed_at` string, date-time, nullable
  - `output` object: Operation result (see each operation). While a Studio render is processing: `stage` (queued · transcribing · downloading · preparing · cleaning_voice · mixing_audio · rendering · finishing), `phase` (the engine's: download · prepare · voice · audio · encode · qa · upload, or null), `progress` (a percent, 0–100) and `progress_fraction` (0–1), `eta_seconds` (seconds left, never below 0) and `estimate_seconds`
    - `id` string: Message ID
    - `status` 'sent'
    - `conversationId` string: Inbox conversation the message was threaded into.
  - `error` string, nullable
  - `usage` object
    - `credits_charged` number, nullable
    - `credits_reserved` number
    - `estimated_credits` number
    - `cost_source` 'provider_reported' | 'calculated' | 'estimated' | 'null', nullable
    - `provider_usage` object, nullable: Normalised consumption, e.g. { VIDEO_SECOND: 22.4 }
  - `balance` object
    - `available` number
    - `reserved` number

## Other responses

- `400`: Invalid input
- `402`: Insufficient credits / project budget
- `404`: Resource not found (or not yours)
- `429`: Rate limited
- `503`: Service temporarily paused

---

[API](https://skmtc.dev/apihub/apis/apihub-one-api-for-chat-image-video-ai.md) · [All operations](https://skmtc.dev/apihub/apis/apihub-one-api-for-chat-image-video-ai/llms.txt) · [OpenAPI document](https://skmtc.dev/apihub/apis/apihub-one-api-for-chat-image-video-ai/revisions/a8caa42835ce?raw)