How do you handle token-based authentication during testing?

Our testers validate JWT and OAuth 2.0 implementations — including token forgery, replay, session invalidation and refresh-token abuse — using test credentials you provide, without disrupting production.

How do you guarantee there are no false positives?

Every AI-detected finding is manually verified by a senior pentester before it reaches your report. This is backed by a contractual zero false positives SLA: if you find a single false positive, you get your money back.

Is retesting included, and what is your retesting SLA?

Yes. Free unlimited retesting is included with every engagement. Once your team applies a fix, we re-verify the affected endpoints at no extra cost so you can prove remediation to auditors and stakeholders.

ImmuniWeb Use CasesAPI Penetration Testing (APT)

API Penetration Testing (APT)

Powered by ImmuniWeb On-Demand

Hybrid human + AI API penetration testing for REST, GraphQL, gRPC, SOAP and WebSockets. Our award-winning ImmuniWeb® On-Demand platform combines machine-speed scanning with a senior-led hybrid assessment to surface the business-logic flaws automated tools miss — delivered with a contractual zero false positives SLA.

Zero False Positives SLAmoney-back guarantee on every report

24-Hour Starttesting begins within one business day

Free Unlimited Retestingverify every fix at no extra cost

Fixed-Fee Transparent Pricingno hidden costs, no surprise invoices

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Why API Penetration Testing Is a Business Revenue Lever

APIs now carry the majority of modern web traffic — and a growing share of modern breaches. A single Broken Object Level Authorization flaw can expose your entire customer database, trigger regulatory fines, and stall every enterprise deal waiting in security review. Treating API penetration testing as a revenue enabler — not a compliance tax — shortens sales cycles, protects recurring revenue, and turns your security posture into a competitive advantage.

With an ImmuniWeb API Pentest

Enterprise deals clear security review faster with an audit-ready report
Vulnerabilities caught pre-production, before they reach customers
Predictable fixed fee with zero false positives to triage
Continuous compliance evidence for PCI DSS, SOC 2 and GDPR
Developer trust: actionable, verified, noise-free findings

Without API Security Testing

Deals stall or collapse in vendor security questionnaires
Zero-day exposure of customer data and tokens in production
Hidden cost of breach response, fines, and customer churn
Failed audits and blocked market entry
Alert fatigue from false positives; real risks ignored

PTaaS Platform Preview: ImmuniWeb® On-Demand in Action

API Penetration Testing (APT) with ImmuniWeb® On-Demand

API Penetration Testing (APT)

EU DORA, NIS 2 & GDPR

Helps fulfil pentesting requirements
under EU laws & regulations

US HIPAA, NYSDFS & NIST SP 800-171

Helps fulfil pentesting requirements
under US laws & frameworks

PCI DSS, ISO 27001, SOC 2 & CIS Controls®

Helps fulfil pentesting requirements
under the industry standards

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Get your cyber risk exposure

Automated API Scanning vs Manual Penetration Testing

	Automated API Scanning	Manual API Penetration Testing
Duration	Minutes to hours, on every commit	A few days, scheduled per release or audit
Cost	Low, subscription-based	Higher, project-based fixed fee
Scope	Known vulnerability patterns, OWASP signatures	Business logic, chained exploits, BOLA/BFLA, auth bypass
Best For	Daily CI/CD regression and broad coverage	Audits, compliance, high-risk and pre-launch APIs
Report	Automated list of findings	Validated, manually exploited, remediation-ready report

Recommendation: Automated scanning is essential for daily CI/CD hygiene and catching regressions fast. But for audits, compliance sign-off, and APIs handling sensitive data, manual penetration testing is mandatory — only a human tester can chain logic flaws into a real exploit. ImmuniWeb® On-Demand combines both: AI-driven coverage plus senior pentester validation in a single engagement.

Comprehensive API Architecture & Security Testing Scope

Every engagement covers your full API surface — documented and undocumented. Upload an OpenAPI/Swagger, Postman or GraphQL schema and our hybrid team tests across four dimensions:

Endpoint Discovery & Functional Coverage

Shadow and zombie API discovery beyond your documented schema
REST, GraphQL, gRPC, SOAP and WebSockets endpoint enumeration
OpenAPI / Swagger and Postman collection parsing for full coverage
Deprecated and undocumented version detection

Authentication, Identity & Access Control

JWT and OAuth 2.0 validation: token forgery and replay testing
Session invalidation, refresh-token and logout flow testing
BOLA (Broken Object Level Authorization) and BFLA exploitation
Privilege escalation and horizontal / vertical access-control bypass

Data Security & Business Logic Integrity

Mass assignment and excessive data exposure testing
Input validation, injection and parameter tampering
Business-logic abuse, workflow bypass and race conditions
Sensitive data leakage in responses, errors and logs

Infrastructure, Gateways & Standards Alignment

Rate-limiting, throttling and resource-exhaustion testing
CORS and CSP misconfiguration analysis
API gateway, WAF and TLS configuration review
Alignment with OWASP API Security Top 10 and SANS Top 25

OWASP API Security Top 10 Vulnerability Mapping

API1 Broken Object Level Authorization (BOLA)

We test every endpoint for object-ID manipulation that lets one user reach another user's data.

API2 Broken Authentication

We probe token handling, JWT/OAuth flaws and credential-stuffing exposure.

API3 Broken Object Property Level Authorization

We check for mass assignment and excessive data exposure in API responses.

API4 Unrestricted Resource Consumption

We stress rate limits and quotas to surface DoS and cost-amplification risks.

API5 Broken Function Level Authorization (BFLA)

We attempt to invoke admin and privileged functions as a low-privilege user.

API6 Unrestricted Access to Sensitive Business Flows

We model abuse of flows like checkout, signup and fund transfers.

API7 Server-Side Request Forgery (SSRF)

We test whether user-supplied URLs can pivot into your internal network.

API8 Security Misconfiguration

We review headers, CORS, TLS and gateway settings for exploitable gaps.

API9 Improper Inventory Management

We hunt shadow, zombie and deprecated APIs that widen your attack surface.

API10 Unsafe Consumption of APIs

We assess how your services trust and process data from third-party APIs.

The 6-Phase API Security Attack Narrative & Kill Chain

Scoping & Schema Onboarding

We define scope and ingest your OpenAPI/Swagger, Postman or GraphQL schema. Artifact: an OpenAPI gap analysis flagging undocumented and risky endpoints.

Phase 1

Phase 2

Passive OSINT & Reconnaissance

We map your exposed API footprint, leaked keys and shadow endpoints from open sources. Artifact: an attack-surface reconnaissance summary.

Automated Vulnerability Scanning & Validation

Our AI engine scans the full surface and analysts validate every finding. Artifact: a verified, false-positive-free vulnerability shortlist

Phase 3

Phase 4

Manual Adversary Exploitation

Senior pentesters chain logic flaws — BOLA, BFLA, auth bypass — into real exploits. Artifact: code-level remediation hints with proof-of-concept.

Audit-Ready Reporting & Debrief

You receive a board- and auditor-ready report plus a live technical debrief. Artifact: full pentest report mapped to OWASP and compliance frameworks.

Phase 5

Phase 6

Continuous Retesting & VAPT Certification

We verify every fix with free unlimited retesting and issue proof of testing. Artifact: a signed compliance / VAPT certificate.

Shift-Left Security: DevSecOps & CI/CD Pipeline Automation

Catch API flaws before they ship. ImmuniWeb® On-Demand plugs natively into GitHub Actions, GitLab CI and Jenkins, turning every pipeline into an automated security gate. Set policy thresholds and vulnerable builds are blocked from deployment automatically — no manual review, no merge of insecure code. Security becomes a pass/fail step in your release, not a quarterly bottleneck, so developers get fast, actionable feedback inside the tools they already use.

Industry-Specific API Threat Modeling

FinTech & Open Banking

Payment-flow and transaction-integrity testing, PSD2 / Open Banking API security, and protection against account takeover and fraud across your money-movement endpoints.

HealthTech & Medical APIs

Patient-data privacy and PHI-exposure testing aligned with HIPAA and GDPR, covering EHR integrations, telehealth APIs and consent flows.

B2B SaaS & Cloud Platforms

Multi-tenancy isolation and tenant-data-leakage testing — ensuring one customer can never reach another customer's data across your shared cloud infrastructure.

Frequently Asked Questions

Q

Which API architectures and protocols do you test?

A

We test REST, GraphQL, gRPC, SOAP and WebSocket APIs across cloud and on-premise environments. Just upload your OpenAPI/Swagger, Postman or GraphQL schema and we cover documented and undocumented (shadow) endpoints alike.
Q

How do you handle token-based authentication during testing?

A

Our testers validate JWT and OAuth 2.0 implementations — including token forgery, replay, session invalidation and refresh-token abuse — using test credentials you provide, without disrupting production.
Q

How do you guarantee there are no false positives?

A

Every AI-detected finding is manually verified by a senior pentester before it reaches your report. This is backed by a contractual zero false positives SLA: if you find a single false positive, you get your money back.
Q

Is retesting included, and what is your retesting SLA?

A

Yes. Free unlimited retesting is included with every engagement. Once your team applies a fix, we re-verify the affected endpoints at no extra cost so you can prove remediation to auditors and stakeholders.

Trusted by 1,000+ Global Customers

ImmuniWeb is an efficient and very easy-to-use solution that combines automatic and human tests. The results are complete, straightforward and easy to understand. It’s an essential tool for the development of the new digital activities