AT&T

AT&T SMS API

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.

GitHub OpenAPI

Documentation

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Documentation
https://developer.att.com/sms/docs
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APIReference
https://developer.att.com/sms/docs/v2
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Authentication
https://developer.att.com/oauth-2/docs
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GettingStarted
https://developer.att.com/sms

Specifications

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OpenAPI
https://raw.githubusercontent.com/api-evangelist/at-and-t/refs/heads/main/openapi/at-and-t-sms-api.yaml