# AgentRelay > A relay station for agent messaging. One API for SMS, voice, Telegram, email, and Slack — normalized into a single event format, with carrier compliance handled through official channels. AgentRelay is multi-channel customer messaging infrastructure built for developers shipping agents. Inbound messages from any supported channel arrive at your endpoint in the same shape; outbound is sent through one unified send API. Carrier registration (10DLC, A2P) and CTIA compliance are handled for you. Status: private preview. Onboarding partners individually. ## Key URLs - [Landing](https://agentrelay.in/): product overview, principles, code example, SMS opt-in mechanism, general-inquiry form. - [SMS opt-in mechanism](https://agentrelay.in/#optin): how end users opt in to AgentRelay SMS by texting START to +1 650 542 0011. - [Privacy Policy](https://agentrelay.in/privacy.html): data we collect, retention, SMS-specific disclosures, no-third-party-mobile-sharing clause. - [Terms of Service](https://agentrelay.in/terms.html): account terms, SMS messaging terms (§ SMS), acceptable use. - [Brand](https://agentrelay.in/brand.html): mark, lockups, color, typography, downloadable SVG assets. ## Channels supported SMS · Voice · Telegram · Email · Slack ## SMS opt-in (A2P 10DLC) Users opt in to AgentRelay SMS by texting `START` to `+1 650 542 0011` from the phone number they want to register. The inbound message is the consent record (mobile-originated opt-in). AgentRelay replies with a 6-digit verification code. - **Opt-out keywords:** STOP, UNSUBSCRIBE, CANCEL, QUIT, END - **Help keywords:** HELP, INFO, SUPPORT - **Frequency:** typically fewer than 5 messages/month - **Provider:** Twilio, Inc. - **Mobile-number sharing:** AgentRelay does not share mobile numbers with third parties or affiliates for marketing. ## Contact - General: hello@agentrelay.in - Support: support@agentrelay.in - Privacy: privacy@agentrelay.in ## Operating regions United States and India.