# AT&T SMS API

**Canonical:** https://apis.io/apis/at-and-t/att-sms-api/  
**Provider:** AT&T — https://apis.io/providers/at-and-t/  
**Base URL:** https://api.att.com  
**Documentation:** https://developer.att.com/sms

AT&T SMS API is one of 5 APIs that [AT&T](https://apis.io/providers/at-and-t/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include SMS, Messaging, Short Code, and Notifications. The published artifact set on APIs.io includes API documentation, an API reference, authentication docs, a getting-started guide, and an OpenAPI specification.

A RESTful API enabling established businesses to broadcast SMS short code messages to AT&T subscribers in the United States. Supports sending to up to 50 recipients per call and up to 1 million messaging API calls monthly. Includes delivery status callbacks and GSMA OneAPI-compatible endpoints.

## Machine-readable artifacts (6)

- **Documentation** — https://developer.att.com/sms/docs
- **APIReference** — https://developer.att.com/sms/docs/v2
- **Authentication** — https://developer.att.com/oauth-2/docs
- **GettingStarted** — https://developer.att.com/sms
- **OpenAPI** — https://artifacts.apis.io/at-and-t/openapi/at-and-t-sms-api.yaml
- **APIsJSON** — https://artifacts.apis.io/at-and-t/apis.yml

## Other AT&T APIs (4)

- [AT&T In-App Messaging API](https://apis.io/apis/at-and-t/att-in-app-messaging-api/)
- [AT&T OAuth 2.0 API](https://apis.io/apis/at-and-t/att-oauth-api/)
- [AT&T MVNX API](https://apis.io/apis/at-and-t/att-mvnx-api/)
- [AT&T Alliance Wireline APIs](https://apis.io/apis/at-and-t/att-alliance-wireline-apis/)

## Tags

SMS, Messaging, Short Code, Notifications

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/at-and-t/att-sms-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/at-and-t/.