What is 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.
What is Sendly used for?
Developers and AI agents use Sendly to send transactional SMS, OTP verification codes, and notifications programmatically to 200+ countries.
How much does Sendly cost?
Pros and cons
Pros
- Sends SMS to 200+ countries with alphanumeric sender IDs for international delivery
- Batch sending of up to 1,000 messages per API request plus future message scheduling
- Built-in OTP support for two-factor authentication and webhook callbacks for delivery status
- Pay-as-you-go credit pricing with no monthly fees, plus test/live keys and sandbox numbers
- AI-agent-native: agents can call the same messaging API that developers use
Cons
- SMS-only; no email, WhatsApp, or other channels documented
- Newer entrant versus established messaging providers, with limited public track record
- No free SMS allowance; you pay per message from the first send
- Higher-tier regions cost up to $0.10 per message, which adds up at volume
Questions about Sendly
What is Sendly?
Sendly is an AI-agent-native SMS API that lets developers and AI agents send text messages programmatically to over 200 countries. It supports OTP verification, batch sending, scheduling, and webhook delivery callbacks, priced on a pay-as-you-go credit model with no monthly fees.
What does 'AI agent native' mean for Sendly?
It means AI agents can use Sendly's SMS API the same way human developers do. Any messaging action a developer could perform through the API, such as sending an SMS or triggering an OTP, an autonomous agent can now perform programmatically as a callable tool.
How much does Sendly cost?
Sendly uses pay-as-you-go credits with no monthly fees. Credit packs range from 100 credits for $5 up to 10,000 credits for $300. Per-message rates start at $0.02 for the US and Canada and go up to about $0.10 for higher-cost regions.
Does Sendly support two-factor authentication?
Yes. Sendly includes one-time password (OTP) functionality for two-factor authentication, along with sandbox test numbers and separate test and live API keys so you can build and verify OTP flows before going live.
What are good alternatives to Sendly?
Common SMS API alternatives include Twilio, Vonage (Nexmo), MessageBird, Plivo, and Telnyx. Sendly differentiates on a simple pay-as-you-go credit model with no monthly fees and AI-agent-native access to its messaging API.
What are the best alternatives to Sendly?
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