Carrier & Toll-Free Messaging Compliance

Last updated: March 2026

This page is written for telecom carriers, aggregators, and compliance reviewers evaluating our Toll-Free messaging registration.

Product Description

AgentSMS is a developer API that allows AI software agents to send and receive SMS messages. It is designed for low-volume, consent-based messaging to known recipients.

The typical user is a software developer who integrates AgentSMS into an AI agent workflow. The agent sends brief, transactional notifications—such as deployment alerts, status updates, or confirmation requests—to phone numbers the developer personally owns or has obtained explicit consent to message.

Message Types

All messages sent through AgentSMS are transactional and informational in nature:

• Automated alerts (e.g., “Build #412 deployed successfully”)
• Status updates (e.g., “Server CPU is above 90%”)
• Confirmation requests (e.g., “Reply YES to approve the release”)
• Personal agent-to-self notifications

AgentSMS is not used for:

• Marketing or promotional messaging
• Political campaigns or fundraising
• Bulk or mass messaging
• Cold outreach of any kind

Sender Identity

All messages originate from registered Toll-Free numbers. We may maintain multiple Toll-Free numbers for redundancy and delivery reliability. We do not use short codes, local numbers, or rotating sender IDs. All Toll-Free numbers are registered and verified through the standard Toll-Free verification process.

Consent & Opt-In

Consent is a prerequisite for using the API. Our Consent & Acceptable Use Policy requires that:

• Every recipient has given consent before receiving any message.
• The primary use case is texting the developer’s own phone number(s).
• Any additional recipients must have directly opted in and understand the nature and frequency of messages.

Opt-Out Handling

We support standard opt-out keywords:

• STOP — Immediately ceases all messages to that number.

Opt-outs are processed automatically and cannot be overridden by the developer. Once a number has opted out, the API rejects further send attempts to that number until the recipient explicitly re-consents.

Volume Controls

AgentSMS enforces strict volume limits:

• Per-number rate limits: A maximum number of messages per phone number per day.

These limits are set conservatively. AgentSMS is designed for single-digit to low-double-digit daily message volumes per account. This is not a platform for high-throughput messaging.

Anti-Spam Safeguards

• Content monitoring: We review message patterns for spam indicators.
• Account verification: API keys are issued to identified developers.
• Carrier feedback: We honor and act on carrier feedback loops and complaints.

Technical Architecture

• Messages are submitted via HTTPS REST API with bearer-token authentication.
• We route through a licensed messaging aggregator for delivery.
• All communications are encrypted in transit (TLS 1.2+).
• Logs are maintained for compliance and audit purposes (90-day retention).