Passwordless Authentication API for Modern Apps
Let your users log in without passwords using Magic Link, OTP, and biometric-ready flows. Reduce friction, boost security, and increase conversions with Authyo.
- No passwords. No resets. No hassle.
- Magic Link, OTP, and more in a single API
- Built for speed, security, and scalability
- Developer-first SDKs & libraries
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Click the link below to sign in to your account.
Frictionless Login
Users log in with email, phone, or magic link.
Stronger Security
Eliminate weak passwords and reduce account takeovers.
Higher Conversions
Improve sign-ups and reduce drop-offs.
Developer Friendly
Simple APIs, SDKs & docs. Go live in hours.
Multi-Channel
Email, WhatsApp, SMS, OTP & Magic Link.
Enterprise Ready
Scalable, reliable, and built for global apps.
Our Customers
Why Developers Choose Authyo
Everything You Need for Secure,
Passwordless Login
Magic Link Login
Passwordless login with one-click magic links.
OTP Login
Email, SMS, WhatsApp OTP authentication.
Passwordless SDKs
SDKs for Web, Android, iOS, Flutter, React Native.
Fallback Authentication
Smart fallback to OTP if magic link fails.
Session Management
Secure sessions, user management & APIs.
Branded Flows
Fully customizable templates & domains.
Simple, Powerful, Fast
Integrate in Minutes with One API Call
Our APIs are designed for developers. Just a single API call to send a magic link or OTP. No complex setups.
- 1
Send authentication request
One API call to initiate login.
- 2
User receives link or OTP
Instant delivery across channels.
- 3
User logs in securely
Passwordless. Fast. Secure.
myHeaders.append("clientId", "");
myHeaders.append("clientSecret", "");
myHeaders.append("origin", "");
const requestOptions = {
method: "GET",
headers: myHeaders,
redirect: "follow"
};
fetch("https://app.authyo.io/api/v1/auth/sendotp?to=&expiry=&otpLength&authWay&otp", requestOptions)
.then((response) => response.text())
.then((result) => console.log(result))
.catch((error) => console.error(error));
$curl = curl_init();
curl_setopt_array($curl, array(
CURLOPT_URL => 'https://app.authyo.io/api/v1/auth/sendotp'
. '?to=&expiry=&otpLength=undefined'
. '&authWay=undefined&otp=undefined',
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => '',
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 0,
CURLOPT_FOLLOWLOCATION => true,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => 'GET',
CURLOPT_HTTPHEADER => array(
'clientId: ',
'clientSecret: ',
'origin: '
),
));
$response = curl_exec($curl);
curl_close($curl);
echo $response;
conn = http.client.HTTPSConnection("app.authyo.io")
payload = ''
headers = {
'clientId': '',
'clientSecret': '',
'origin': ''
}
conn.request("GET", "/api/v1/auth/sendotp?to=&expiry=&otpLength=null&authWay=null&otp=null", payload, headers)
res = conn.getresponse()
data = res.read()
print(data.decode("utf-8"))
{
MaxTimeout = -1,
};
var client = new RestClient(options);
var request = new RestRequest("/api/v1/auth/sendotp?to=&expiry=&otpLength&authWay&otp", Method.Get);
request.AddHeader("clientId", "");
request.AddHeader("clientSecret", "");
request.AddHeader("origin", "");
RestResponse response = await client.ExecuteAsync(request);
Console.WriteLine(response.Content);
Built for Every Use Case
Where Passwordless Authentication Works Best
SaaS Platforms
Simplify login for your users and teams.
E-commerce
Increase conversions with faster checkout.
Fintech & Banking
Secure logins without compromising UX.
Marketplaces
Seamless onboarding for buyers & sellers.
Mobile Apps
Passwordless auth for mobile-first apps.
Startups
Launch fast with ready-to-use APIs.
Works with Your Stack