Welcome to SMS Factory
Welcome to the Textingline API — a RESTful messaging platform for sending SMS and MMS at scale. Whether you're delivering transactional notifications, verification codes, or marketing broadcasts, the API gives you full programmatic control over your messaging.
Messaging Guides
Send an SMS or MMS to a single recipient
Deliver the same message to up to 50,000 recipients
Attach images, videos, and files to your messages
Safely retry requests without sending duplicates
Understand carrier content rules and SHAFT policies
Manage sender numbers assigned to your account
Contact Management
Mental model — Contact, Group, Membership, Custom Field
Create, read, and update contacts by phone number
Add or remove a contact from a group; handle opt-in flows
List and read your account's groups
Discover the per-contact schema your account has defined
The Basics
HTTP Basic Auth with your API Key ID and Secret
Full reference of error codes and troubleshooting tips
Understand request limits and how to handle 429 responses
Receive delivery receipts and status updates in real time
Official clients for Node.js, Python, and more
Track API updates, new features, and deprecations
Updated 3 months ago