Blog
Product notes, release announcements, and what we learn running OTP delivery in Korea.
Global verification APIs such as Twilio Verify and Vonage Verify do not list KakaoTalk as a channel. K-OTP issues and verifies codes over KakaoTalk AlimTalk, with test keys and an SDK.
The per-message price is only one line of what a verification code costs. A look at AlimTalk and SMS prices, DIY SMS fallback, and the code you have to build and keep running, and how K-OTP prices a send.
A minimal, working phone OTP login for Next.js App Router with Server Actions and @k-otp/sdk 2.1.0. Codes arrive by KakaoTalk AlimTalk; retries never send twice. Try it free with test keys.
Show your app's service name in every OTP message without changing your code. API 2.x delivers codes by KakaoTalk AlimTalk only, and SDK 2.1.0 supports it without breaking changes.
Phone verification for apps serving Korean users. Issue a one-time code, deliver it by Kakao AlimTalk, and verify it, with retries that never send twice.