E~3s · lowest cost
Email OTP: the lowest-cost verification channel.
Resend infrastructure, your own sending domain, SPF/DKIM-ready templates. Ideal for high-volume signup flows.
How it works
1
Verify your domain
Add the DNS records in the panel; SPF, DKIM and DMARC are checked automatically.
2
Pick a template
Use the built-in OTP template or your own HTML, with TR/EN localization.
3
Send
When recipient is an email address the channel resolves to email automatically.
4
Track
Open and bounce events stream to your webhook; bounces are not billed.
$ curl -X POST https://api.kolayotp.com/api/v1/otp/send \
-H "Authorization: Bearer kotp_live_..." \
-d '{"channel":"email","recipient":"ali@company.com",
"template":"otp_default","locale":"en"}'
{
"id": "otp_2Hn4bY",
"channel": "email",
"status": "sent",
"from": "verify@company.com",
"attempts_left": 5
}Channel specifications
ProviderResend
Typical latency~3s
Unit price₺0.04 / OTP
Custom domainSupported
FallbackSMS
TemplateHTML + plain text
Send your first OTP in five minutes.
No credit card. Start on a sandbox key and switch to live when you're ready.