Sendly

Sendly is an AI-agent-native SMS API tool that lets developers and AI agents send text messages programmatically to over 200 countries. Built as an SMS-for-developers platform, Sendly exposes the same messaging capabilities to autonomous AI agents that human developers use, so agents can send SMS, verify users, and trigger alerts through the API. Concrete features include SMS delivery to 200+ countries with alphanumeric sender IDs, batch sending of up to 1,000 messages per request, message scheduling for future delivery, one-time password (OTP) support for two-factor authentication, webhook callbacks for real-time delivery status, message history retrieval and filtering, and separate test and live API keys with rotation plus sandbox test numbers. Pricing is credit-based and pay-as-you-go with no monthly fees: credit packs start at 100 credits for $5, and per-message rates run from $0.02 domestic (US/Canada) up to $0.10 for higher-cost regions. Sendly suits developers building transactional SMS, OTP verification, and notification flows, and now targets AI agent builders who need programmatic messaging as a callable tool.

Developers and AI agents use Sendly to send transactional SMS, OTP verification codes, and notifications programmatically to 200+ countries.