Authentication refers to the process of verifying the identity of users accessing computer systems. Authentication is what identifies a user and confirms that the person is who they claim to be. It’s an essential aspect of ensuring the security of systems.
There are a wide variety of tools that have been developed to assist with user authentication and maintaining the security of applications. Furthermore, some of these tools have exposed their APIs (Application Programming Interfaces) to allow developers to fetch their features and integrate into applications.
To assist you in identifying the best API to use, we evaluated several user authentication APIs based on the following three main factors:
- API features: We assessed the features that make each of the APIs essential for authenticating the identity of users.
- Pricing: We looked at the cost of incorporating each of the APIs into applications.
- Ease of use: We reviewed the ease of embedding each of the APIs to applications.
Eventually, we came up with the following list of the top 10 best user authentication APIs:
- SMS API by MoceanAPI
- Nexmo API
- Address Verification API
- Typing Biometrics API
- Phone Verification API
- One Time Password API
- TeleSign API
- 2Factor Authentication API
- mOTP API
- Credential API
Top 10 Best User Authentication APIs
TL;DR: Here’s a table that summarizes our main findings:
|API||API Features||Pricing||Ease of Use|
|SMS API by MoceanAPI||Send code via SMS or voice calls for user authentication||Varying paid plans based on country||Easy|
|Nexmo API||Send PIN via SMS for user authentication||Varying paid plans based on country||Easy|
|Address Verification API||Validate the existence of local and international postal addresses||Free trial plan and paid pricing||Easy|
|Typing Biometrics API||Recognize users’ unique typing patterns for authentication||Free plan and varying paid plans from $99.00 to more than $499.00 per month||Easy|
|Phone Verification API||Send code via SMS for user authentication||Free plan and varying paid plans||Easy|
|One Time Password API||Generate time-based, one-time passwords for multi-factor authentication||$50 per month||Easy|
|TeleSign API||Send time-based, one-time passcodes via SMS for user authentication||Free plan and varying paid plans from $10 to more than $250 per month||Easy|
|2Factor Authentication API||Send one-time passwords via SMS and voice calls for user authentication||Varying paid plans||Easy|
|mOTP API||Send one-time passwords via missed calls||Free||Easy|
|Credential API||Manage users’ credentials and check for third-party authentication||Free||Easy|
The SMS API by MoceanAPI enables developers to send SMS or voice calls to users to authenticate their identity.
API features: With the MoceanAPI API, you can generate a random code that verifies that a user can be contacted at the stipulated phone number. By default, the generated code is sent through a short text message (SMS). If the user does not reply, the API tries to send another confirmation through voice call using text-to-speech (TTS) technology.
Pricing: MoceanAPI offers authentication plans that vary from country to country. For example, in the U.S., every conversion is priced at €0.0750.
Ease of use: There is easy to follow documentation that is full of code samples to help you in integrating the API fast and flawlessly.
2. Nexmo API
The Nexmo Verify API is an all-in-one user authentication API that assists you to safeguard against fraud, create trust, and multiply conversions across different channels.
API features: The Nexmo Verify API enables you to generate and send a PIN via SMS to a user’s phone. This way, you can confirm whether the user can be contacted at the stipulated phone number. The API also comes with endpoints for checking the status of the previous or present verification requests and cancelling an existing verification request.
Pricing: Nexmo offers a flexible payment plan that lets you pay only for successful verifications, anywhere you are. For example, in the U.S., each successful verification costs €0.0300.
Ease of use: Nexmo maintains detailed documentation to help in getting up and running with the API as fast as possible.
The Address Verification service from Byteplant, called Postal Address Online Validator, keeps a list of local and international postal addresses to allow you in easily confirming their existence.
API features: With the Postal Address Online Validator API, you can remove invalid, inaccurate, or outdated addresses from your lists and maintain the fidelity of your records. The Byteplant database contains postal addresses collected from more than 240 countries around the world. Therefore, you can easily clean up addresses or verify addresses and avoid wasting money on mailings and shipments to incorrect addresses.
Pricing: Byteplant offers a trial plan that allows you to validate a list of 100 addresses for free. For more intense usage, you’ll need to contact them for specific pricing.
Ease of use: Byteplant keeps detailed documentation to assist you in integrating the API without many difficulties.
The Typing Biometrics Authentication API allows you to innovatively recognize users’ unique typing patterns and use them for validating access to applications.
API features: With the Typing Biometrics Authentication API, you can create a unique biometric profile of users based on their typing behavior and use that for authentication purposes. The API comes with endpoints for saving or enrolling a new user typing pattern, verifying the typing pattern, checking the existence of users, and deleting a user and their typing patterns.
Pricing: As long as you make less than 100 verify requests per month, you can use the API for free. To complete more requests and access other better features, you can go for any of its paid plans, which starts from $99.00 per month to more than $499.00 per month.
Ease of use: There is simple and easy to follow documentation to assist you in making the most of the API.
The Phone Verification API is a simple API that lets you confirm the identity of users and prevent fraud.
API features: With the Phone Verification API, you can generate codes and send them via text messages so that users can verify their identity. This way, you can eliminate fraudulent activities before a medium that’s difficult to fake is used—the phone number.
Pricing: You can make up to 500 free new requests using the API; thereafter, you’ll be charged $0.001 for every additional request. For lookups, you can make up to 1,000 free requests, thereafter, you’ll be charged $0.001 for every additional request.
Ease of use: The Phone Verification API is simple and straightforward; you can get up and running with it within a few minutes.
The One Time Password API enables you to generate time-based, one-time passwords—just as the name suggests.
API features: With the One Time Password API, you can create one-time passwords for multi-factor authentication purposes and for confirming the validity of transactions.
Pricing: You can buy credits at $50 per month and use them for integrating the API.
Ease of use: There is simple documentation that lets you integrate the API within the shortest time possible.
7. TeleSign API
The TeleSign SMS Verify API provides a way of validating users and safeguarding accounts from compromise.
API features: The Telesign SMS Verify API allows you to embed phone-based verification and two-factor authentication capabilities to your applications. With the API, you can send time-based, one-time passcode (TOTP) via text messaging and authenticate the details of known users, confirm transactions, or prevent fraudsters from carrying out unauthorized activities.
Pricing: You’ll get 1,000 credits per month for using the API for free. For more extensive usage, you can go for any of its paid plans, which starts from $10 per month to more than $250 per month.
Ease of use: Telesign maintains detailed documentation on how to use the API for delivering global, phone-based verifications.
The 2Factor Authentication API provides phone verification possibilities to users in India and around the world.
API features: With the 2Factor Authentication API, you can send one-time passwords (OTPs) via SMS so that users can authenticate their identity easily. The API also allows you to send OTPs over voice calls.
Pricing: For using the API’s SMS OTP service, you’ll pay 0.18 rupees for every delivered authentication. For using the voice OTP service, you’ll pay 0.34 rupees for every delivered authentication.
Ease of use: You can use the API’s exhaustive documentation for getting started easily and quickly.
9. mOTP API
mOTP is an innovative two-factor authentication service that allows you to verify users’ identity without using SMS.
API features: The mOTP API uses a missed call to send OTPs to users, enabling you to side-step the expenses and other performance issues often associated with traditional text messaging.
Pricing: mOTP is an open sourced project; therefore; it’s available for free.
Ease of use: Using the API for users’ phone verification is easy and straightforward.
10. Credential API
The Credential API is a simple API that enables you to maintain the security of sensitive users’ information.
API features: With the Credential API, you can manage the credential of users and check for third-party authentication. The API comes with endpoints for creating users, confirming users’ tokens, retrieving lost tokens, and getting users’ details such as emails and passwords.
Pricing: The API is available for free.
Ease of use: There is simple documentation to help you in embedding the API to applications and web services without many hurdles.
That’s Rakuten RapidAPI’s list of Top 10 Best User Authentication APIs. We hope you’ll find an API that you can incorporate into your application and verify the identity of users easily and comfortably.
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