Relay

What it does

Sign up, get an API key, send your first SMS in 2 minutes. Relay is the SMS API developers actually want to use. One endpoint, 5 lines of code, compliance handled for you. No carrier registration, no telecom expertise required. AI agents can sign up and start sending autonomously via API. Includes sms-dev, a free local testing tool (think Mailtrap for SMS). Transparent pricing: $19/mo with 1,500 messages. US & Canada.

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