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API Penetration Testing

We will check the interaction between systems – order an API pentest to identify vulnerabilities and protect data.
  • 400+
    pentests
  • 78
    attacks repelled
  • 56
    successful solutions
15 vulnerabilities
on average per project
34 countries
covered by our services
8 years
of experience in cybersecurity
Solution for strengthening protection
API pentest service

API penetration testing is a controlled simulation of an attack on interaction points between systems to identify vulnerabilities in request logic, authorization, and data processing.

During the test, we determine whether an attacker can gain unauthorized access, steal data, or bypass protection.

  • We check critical API components
    We test endpoints, request logic, tokens, authorization, and protection against common attacks - to find vulnerabilities to breaches.
  • We provide advice on how to strengthen protection
    In the report, we outline practical recommendations for eliminating each identified issue and prioritize threats by risk level.
  • We work for your business
    We test APIs of companies of any scale - from startups to large corporations, regardless of industry or product type.
84
tools
for testing
600+
completed
projects
26
cybersecurity
certificates
78%
of customers become
regular clients
SUCCESSFUL COLLABORATION EXPERIENCE
Our project case studies
UNIQA UNIQA
UNIQA: iOS App Security Assessment
Financial institution Financial institution
Banking Security Audit Across Digital Channels
BookingSync BookingSync
API Security Testing for GDPR Readiness
View all cases
Our clients
Paybis
cpay
banxe
friend
montify
liminal
getida
Solvd
Andromeda
Invictus
Cloverpop
Antosha
API pentest features

API penetration testing focuses not on the interface or web applications, but on the logic of connections between components. It reveals vulnerabilities invisible during standard checks - improper access rights management, logical errors in scenarios, etc.

API security evaluation helps protect user and business data, assess compliance with security principles, meet standards requirements (for example, ISO 27001, GDPR), and increase the trust of clients and partners.

  • Business logic testing. We identify access rule errors, role bypasses, and unauthorized attacker actions.
  • Authorization and token analysis. We determine whether a token can be substituted, unauthorized access to others’ data obtained, and restrictions bypassed.
  • Security assessment of requests and responses. We examine possible injections, data leaks, and incorrect parameter handling.
  • Want to check your API security?
    Contact us - we will answer your questions and provide a free consultation.
Our certificates
Benefits of API penetration testing
Effective solutions for your security
Benefits of API penetration testing

Every Datami project is unique. To make penetration testing as useful as possible for the client, we take into account the specifics of the business and the customer’s requirements.

We prepare the test report so that it is valuable for IT specialists and clear for non-technical employees, providing a real picture of the state of cybersecurity.

By ordering an API penetration test, you will receive:

  1. A prioritized list of risks with recommendations. So you understand how and in what order to eliminate weaknesses.

  2. A free retest after eliminating the identified threats. This allows you to check whether all vulnerabilities have been removed.

  3. Strengthening of business cybersecurity. Penetration testing helps detect weaknesses and prevent real breaches.

  4. Readiness for compliance checks. The pen test report confirms security during audits.

  5. Increased trust of clients and partners. Regular pentesting demonstrates a responsible approach to data protection.
Documentation of results
API pentest report
The final penetration testing report contains the necessary information to improve the level of IT security. We describe all identified vulnerabilities, indicate their severity, and provide recommendations for eliminating each threat.
Penetration test report
Review a sample report that we provide to clients after completing an API pentest.
Strategies proven in practice
Our approach to API pentesting

The team of certified Datami pentesters combines automated tools with manual methods. We monitor new threats and respond quickly by updating our approach to API penetration testing.

We focus on manual research of business logic, testing of edge cases, analysis of role-based authorization, and the possibility of access token substitution. We apply black-, grey-, and white-box strategies:

Black-box
Black-box

Pentesters have no access to internal information. This is the most realistic simulation of a hacker attack.

Gray-box
Grey-box

Ethical hackers have partial knowledge of the API - this approach provides a more complete picture of vulnerabilities.

White-box
White-box

Full access to documentation, logic, and accounts ensures maximum depth of assessment.

API penetration testing toolkit
Methodologies and tools
We use international standards and professional cybersecurity tools for effective and safe penetration testing.
Framework for detecting critical vulnerabilities in APIs
Framework for detecting critical vulnerabilities in APIs
Methodology describing the stages and approaches of pentesting
Methodology describing the stages and approaches of pentesting
Framework for IT process management and compliance
Framework for IT process management and compliance
Methods of collecting and analyzing open data to identify threats
Methods of collecting and analyzing open data to identify threats
Vulnerability scanner for automated detection of weaknesses
Vulnerability scanner for automated detection of weaknesses
Tool for discovering active hosts, open ports, and running processes
Tool for discovering active hosts, open ports, and running processes
Powerful tool for automated and manual API security assessment
Powerful tool for automated and manual API security assessment
National standards for security testing and vulnerability assessment
National standards for security testing and vulnerability assessment
Standard describing the methodology of objective security testing
Standard describing the methodology of objective security testing
How our cooperation is evaluated
Client reviews
The quality and effectiveness of Datami’s services are best demonstrated by our clients. On the Clutch platform, you can find honest and unbiased opinions from companies that have already ordered API penetration testing.

We are grateful for the high evaluation of our work!
Threats detected by penetration testing
The most common API vulnerabilities
01.
Authentication flaws
Weaknesses in login, tokens, or sessions allow an attacker to impersonate another user.
example_1
02.
Injections (SQL, command, code)
Insufficient input filtering llows execution of external commands or SQL queries.
example_2
03.
Unrestricted request rate
Lack of request rate limiting opens the way to brute force attacks, spam, or DoS.
example_3
04.
Business logic errors
The API allows actions that break the rules (free purchase, multiple use of a one-time code, etc.).
example_4
05.
Improper error handling
API responses may reveal technical information: database structure, variable names, or call stack.
example_5
06.
Mass assignment
The API allows modification of hidden or restricted fields, such as user roles or access rights.
example_6
07.
Data leakage
Passwords, tokens, or personal information are transmitted without encryption or accessible in plain text.
example_7
08.
Authorization issues (IDOR)
The API does not control access rights, which makes it possible to retrieve or modify someone else’s data by knowing only the identifier.
example_8
09.
Insecure deserialization
Incorrect processing of structures (JSON, XML) can lead to execution of malicious code on the server side.
example_9
Additional pentest services by Datami
01.External penetration testing
More
02.Internal penetration testing
More
03.Network penetration testing
More
04.Mobile application pentest
More
05.Infrastructure pentest
More
06.Web application pentest
More
07.Cloud penetration testing
More
08.Blockchain pentest
More
09.AWS penetration testing
10.GCP penetration testing
11.Azure penetration testing
12.Objective-oriented pentest
13.CheckBox penetration testing
14.Extended penetration testing
15.Wireless network (Wi-Fi) pentest
16.White-box pentest
17.Black-box pentest
18.Gray-box pentest
FAQ

Depending on complexity. Usually, from 5 to 10 business days. We will provide exact timeframes during the project assessment.

The price is influenced by the number of endpoints, level of access, amount of documentation, type of pentesting strategy (black-, grey-, white-box), and additional conditions.

Yes, we sign a Non-Disclosure Agreement (NDA) to guarantee the confidentiality of your data and access.

Yes, we adapt the pentest to your goals — we can check only selected points or specific functions.

No. We test in a controlled mode - all actions are pre-agreed to avoid service interruptions.

Yes, this is a common practice. At the client’s request, we conduct a comprehensive assessment of both the API and the web application frontend within one project.

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