This page is designed to help you find out whether SecondFactor is good and if it is the right choice for you.
SecondFactor is an OTP API for vibe-coders and product teams that delivers and verifies OTPs over SMS, WhatsApp, RCS, and Viber through a single integration. It's built for two-factor authentication (2FA), and OTP verification. It fits fintech, tech-enabled marketplaces, and international platforms that send OTPs to users in more than one country.
The cost of OTP Delivery rises as you add countries, channels, and destinations. Even with these complications, the OTP often fails to arrive, causing valuable customers to abandon sign-up, or a purchase.
This is where SecondFactor comes in: the Intelligence Engine identifies the destination country and operator, checks which channels are available, and uses automatic routing to send the OTP over the lowest-cost eligible channel. If the delivery isn’t confirmed within 8 seconds, automatic fallback moves to the next eligible channel.
Your backend doesn't generate, store, or check the code itself. Instead, SecondFactor generates the code, picks the optimal channel, delivers the OTP and verifies it.
The SecondFactor dashboard consists of every OTP's destination, channel, delivery status, and cost, in one place across all channels.With multiple SDKs alongside LLM-friendly API, integration with AI agents like Claude, Copilot, Cursor, etc. becomes seamless. If you are moving from another OTP provider, you keep a simple send-and-verify integration instead of rebuilding your verification workflow.
With credible coverage of 130+ destinations, including the USA, UK, Germany, France, India, Mexico, Peru, Brazil, and many more, sending international OTPs is efficient, and reliable. Our clients – Rara Global Ventures, Lambda Payments, Janaki Technology, and Eventra – have experienced and appreciated the reliability of our service.
Get started with SecondFactor and get your $5 in free credits. Test real OTP in the Playground.
Listed in
Channels
SMS, WhatsApp, RCS, and Viber
Automatic routing
Sends each OTP over the lowest-cost eligible channel
Automatic fallback
Moves to the next eligible channel if delivery isn't confirmed within 8 seconds
Delivery logs
Shows the channel, status, and cost of every OTP
Authentication templates
Managed from the dashboard
SDKs
Kotlin, Swift, Dart, TypeScript, and server-side
LLM-friendly API
The API and SDKs work with AI agents like Claude, Copilot, and Cursor
Country Coverage
130+ countries, including the USA, UK, Germany, France, India, Mexico, Peru, and Brazil
OTP Playground
Test real OTP delivery in the Playground
The Intelligence Engine identifies the destination country and operator, checks which channels are available, and uses automatic routing to send the OTP over the lowest-cost eligible channel. If the delivery isn't confirmed within 8 seconds, automatic fallback moves to the next eligible channel.
Your backend doesn't generate, store, or check the code itself. Instead, SecondFactor generates the code, picks the optimal channel, delivers the OTP and verifies it. If you are moving from another OTP provider, you keep a simple send-and-verify integration instead of rebuilding your verification workflow.
SecondFactor is an OTP API for vibe-coders and product teams. It fits fintech, tech-enabled marketplaces, and international platforms that send OTPs to users in more than one country.
We have collected here some useful links to help you find out if SecondFactor is good.
Check the traffic stats of SecondFactor on SimilarWeb. The key metrics to look for are: monthly visits, average visit duration, pages per visit, and traffic by country. Moreoever, check the traffic sources. For example "Direct" traffic is a good sign.
Check the "Domain Rating" of SecondFactor on Ahrefs. The domain rating is a measure of the strength of a website's backlink profile on a scale from 0 to 100. It shows the strength of SecondFactor's backlink profile compared to the other websites. In most cases a domain rating of 60+ is considered good and 70+ is considered very good.
Check the "Domain Authority" of SecondFactor on MOZ. A website's domain authority (DA) is a search engine ranking score that predicts how well a website will rank on search engine result pages (SERPs). It is based on a 100-point logarithmic scale, with higher scores corresponding to a greater likelihood of ranking. This is another useful metric to check if a website is good.
The latest comments about SecondFactor on Reddit. This can help you find out how popualr the product is and what people think about it.
Do you know an article comparing SecondFactor to other products?
Suggest a link to a post with product alternatives.
Is SecondFactor good? This is an informative page that will help you find out. Moreover, you can review and discuss SecondFactor here. The primary details have not been verified within the last quarter, and they might be outdated. If you think we are missing something, please use the means on this page to comment or suggest changes. All reviews and comments are highly encouranged and appreciated as they help everyone in the community to make an informed choice. Please always be kind and objective when evaluating a product and sharing your opinion.
