Securely login with SMS Authentication

Protect your customers from unauthorised access via an SMS message with a one-time password.

Get started

With one simple SMS API you can send a password, login or verification code quickly and securely via an SMS message to your customer.

Security and safety

An SMS message with Two Factor Authentication (2FA) or a One-Time-Password (OTP) sent to your customers gives you the certainty that they can log in securely to your network.
SMS Gateway

Proven cost savings

The use of easy passwords leads to a loss of billions of euros worldwide. These unnecessary costs can be prevented quickly and easily with SMS Authentication.
Security & Reliability

These companies use our SMS authentication

reduced the
no-show by 70%

increased the
turnover by 25%

time saving of
1 in 5 days

more than 35%
click-through rate (CTR)

“Spryng delivers SMS to businesses to make processes more efficient and to simplify internal and external communication.”

ABN AMRO sends SMS via Spryng

The confirmation code for the registration is: 708111. This code is only valid for 15 minutes. Yours sincerely, ABN AMRO

“We experience the SMS service as fantastic, reliable, very customer-friendly and always available.”

KLM sends SMS via Spryng

Your flight with flight number KL2016010 has been delayed with 15 minutes and leaves at 15.00 hours from Gate 2C.


Simply connect the SMS Gateway

Do you wish to start today with SMS Authentication? Our SMS Gateway API is quickly installed and offers all possibilities for sending SMS, such as sending one-time passwords.
Developer documentation

curl --location --request POST "" \
  --header "Accept: application/json" \
  --header "Authorization: Bearer xxxxxx" \
  --header "Content-Type: application/json" \
  --data "{
    \"body\": \"This is a test message.\",
    \"encoding\": \"unicode\",
    \"originator\": \"DocsTest\",
    \"recipients\": [
    \"route\": \"1\",
    \"scheduled_at\": \"2019-01-01T15:00:00+02:00\"