API penetration testing

Prices starting at $4,999.

API penetration testing is a manual security assessment of APIs, microservices, and their supporting controls. Researchers simulate attacks to identify exploitable weaknesses in authentication, authorization, business logic, and data handling.

Blaze's penetration testing services  assess how your APIs enforce access across users, roles, tenants, and services. We validate real attack paths and give your engineering team reproducible evidence and practical fixes.

Blaze is a CREST-accredited company. Our researchers hold certifications including OSCP, OSWE, OSCE, and CRTO.

Testing draws on the OWASP API Security Top 10 (2023), OWASP ASVS, PTES, and NIST SP 800-115. Researchers use Burp Suite, OWASP ZAP, Postman, and custom tooling alongside manual investigation.

Assessments can cover AWS-hosted APIs, microservices, and serverless backends, with authenticated and unauthenticated testing tailored to your architecture.

Explore our API penetration testing approach .

We assess applicable OWASP API Security Top 10 risks, including:

• Broken Object Level Authorization: Unauthorized access to another user's or tenant's records
• Broken Authentication: Weak token handling, session controls, and authentication flows
• Broken Object Property Level Authorization: Unauthorized field changes and excessive data exposure
• Unrestricted Resource Consumption: Weak limits on requests, processing, storage, or service costs
• Broken Function Level Authorization: Access to privileged operations without the required permissions
• Unrestricted Access to Sensitive Business Flows: Automated abuse of high-value workflows
• Server Side Request Forgery: API functionality used to reach unintended systems
• Security Misconfiguration: Unsafe defaults, exposed diagnostics, and configuration weaknesses
• Improper Inventory Management: Forgotten versions, undocumented endpoints, and exposed legacy APIs
• Unsafe Consumption of APIs: Insufficient validation of data received from external services

Testing also covers injection, race conditions, authentication bypass, business-logic flaws, and relevant OpenAPI/Swagger documentation. Scope and depth reflect your API's functionality, data sensitivity, and threat model.

Assessments can be commissioned individually or combined across:

• REST APIs
• GraphQL APIs, including resolver authorization and query resource controls
• SOAP and web services
• gRPC and Protocol Buffers
• Microservices and service-to-service authorization
• AWS API Gateway, Lambda, and serverless backends
• Open banking APIs and relevant FAPI security controls
• Source-code-assisted API testing

We test access between accounts, roles, and organizations, including tenant isolation and privileged operations. Test accounts, documentation, and source-code access can improve coverage where available.

Assessment effort typically ranges from 5 to 15 person-days, depending on endpoint count, complexity, roles, and testing depth. The testing window and report delivery date are agreed during scoping.

You receive:

• Executive summary explaining key risks, attack scenarios, and business impact
• Technical report documenting scope, methodology, validated findings, and reproduction steps
• Severity ratings, remediation priorities, and practical correction guidance
• Relevant mappings to OWASP API Security Top 10 and applicable compliance requirements
• Signed attestation letter documenting scope and assessment completion
• Free re-test when performed within 90 days of the final report

Final reports are delivered within five business days of assessment completion.

Where scope and requirements overlap, findings may support SOC 2, ISO 27001, PCI DSS, and enterprise vendor security reviews. They can also inform security risk assessments for systems handling regulated data, without replacing each framework's separate obligations.

Prices start at $4,999, with discounts for early-stage startups and small businesses. Final pricing depends on scope and complexity.

Talk to an expert about your API pentest .

Email:  sales@blazeinfosec.com 

Phone: +1 347 892 4783 (US/Canada)

Phone: +351 222 081 647 (Europe/international)

Blaze is a CREST-accredited, ISO 27001 and ISO 9001 certified company, with worldwide professional liability (E&O) coverage of $5,000,000 through Hiscox.