API Security
Testing
BOLA. BFLA. Mass assignment. Business-logic abuse. The bugs that hide behind the UI — found by humans, validated by AI, reviewed three times.
Trusted by India's leading enterprises
Scope
Spec ingestion, traffic capture, auth flows. We map every endpoint and parameter in Lemon.
Test
5–14 days of OWASP API Top 10, business-logic abuse, GraphQL/WebSocket specifics, AI coverage validation, and three-layer QA.
Deliver
Executive + technical reports with curl/Postman reproduction, language-specific code fixes, retest, and certificate.
What Is API Security Testing?
API security testing is a structured assessment where certified experts test the REST, GraphQL, gRPC, and WebSocket APIs your applications expose — covering OWASP API Top 10 plus deep manual business-logic abuse, replay, and transaction-flow manipulation that scanners can\'t simulate. Required by RBI PA-PG, PCI DSS v4.0, and DPDP Act for any API processing payments or personal data.
Beyond spec-driven scanning
What scanners can\'t see — authorisation gaps, mass assignment, business-logic abuse, replay attacks.
BOLA / IDOR
Object-level authorisation: can user A read user B's record by changing the ID?
BFLA
Function-level authorisation: can user A call admin functions by changing the verb or path?
Mass Assignment
Sending extra fields the API silently accepts: role=admin, isVerified=true
Auth & Tokens
JWT replay, weak signing, token leakage, refresh-flow abuse, session fixation
GraphQL Specifics
Introspection abuse, query depth/complexity DoS, field-level authz, mutation abuse
Rate-Limit Bypass
Per-endpoint, per-user, per-IP — bypass via header injection, casing, parameter pollution
Webhook Signature Replay
Stripe, Razorpay, partner webhooks — replay, timestamp tolerance, signature validation gaps
Business Logic
Race conditions, workflow tampering, multi-step exploits, payment-flow abuse
Methodology
9 steps. Every endpoint exercised.
Every engagement runs through Lemon, our audit-management platform — informed by 6,700+ prior assessments and consistent across the team that delivers it.
Specification & Traffic Discovery
Ingest OpenAPI / GraphQL schemas / Postman collections plus authenticated traffic captures. Lemon merges declared and observed surfaces — observed always wins on conflict.
Endpoint & Parameter Enumeration
Document every endpoint, method, parameter, header, and content type. Identify undocumented endpoints from traffic and JS bundle analysis. Flag deprecated and shadow-API surfaces.
Authentication Flow Mapping
OAuth, SAML, JWT, API keys, mTLS, custom schemes. Document every auth path, token lifecycle, refresh flow, scope enforcement, and exception handling.
OWASP API Top 10 Coverage
BOLA (object-level authz), BFLA (function-level authz), broken authentication, mass assignment, security misconfiguration, injection, improper inventory, unrestricted resource consumption.
Business Logic Abuse
Workflow tampering, race conditions, replay, transaction-flow manipulation, multi-step exploits — what scanners can't see. Payment-flow logic abuse is its own deep-dive.
GraphQL & WebSocket Specifics
GraphQL introspection abuse, query depth/complexity DoS, field-level authz, mutation abuse. WebSocket auth, message-replay, and origin-bypass tests.
AI-Augmented Coverage Validation
AI cross-references declared spec, traffic, and JS analysis to find missed endpoints and parameters. Validates test coverage before delivery.
Three-Layer QA Review
L1 API auditor → L2 senior consultant → L3 security architect. Every finding validated, every reproduction reviewed, every CVSS scored consistently.
Reporting & Re-test
Executive + technical reports with curl / Postman reproduction, language-specific code fixes, retest rounds, and security assessment certificate.
Quality Assurance
Three-layer review on every API assessment
Every finding passes through three mandatory review layers before it reaches your report.
No report is released without L3 sign-off, and Lemon holds delivery while any quality alert is still open.
L1: API Auditor
Runs the test cases, documents every finding with a step-by-step proof of concept in Burp Suite and cURL, and uploads every artefact to Lemon.
L2: Senior Consultant
Validates the methodology against the full endpoint and parameter inventory from discovery, identifies coverage gaps, adds test cases for business-logic scenarios not yet exercised, and checks each finding for accuracy.
L3: Security Architect
Validates the impact assessment on every finding, confirms the risk severity classification, checks reporting quality, and signs off the engagement for delivery.
The Platform
What Lemon gives you during the engagement
Lemon is the audit-management platform every engagement runs on. Three of its functions are visible to your team while testing is under way, not only to ours.
Shadow API discovery
Lemon correlates your API documentation, JavaScript analysis, intercepted traffic, route files, and server logs to surface undocumented and shadow endpoints your team may not know exist.
Real-time findings dashboard
See findings as they are identified, track project timelines and issue status, and start remediation during the engagement rather than after the final report.
Controlled scan orchestration
Automated scanners are centrally managed: scheduled scan windows, notifications to your team, IP controls, and pause or resume mid-run.
Compliance-Ready
Audit-ready reporting for API mandates
API testing reports satisfy the technical-VAPT clauses your regulator and acquirer will check — OWASP API Top 10, RBI PA-PG, PCI DSS, DPDP, ISO 27001 secure-development.
Common engagement scopes
What clients ask us to test
Across 1,000+ enterprise customers, API engagements cluster into a handful of well-defined patterns — each sized for our 5–14 day delivery window.
Deliverables
What you get
Reports for two audiences — risk picture for leadership, exact code-level fixes for your API engineers in their language (Node.js, Python, Java, Go, .NET).
Executive Report
Risk overview, critical findings, business impact, remediation priorities. Board-ready.
Technical Report
POCs, curl / Postman reproductions, request/response data, CVSS, language-specific code fixes.
Retest & Walkthrough
Multiple retest rounds at no extra cost. Walkthrough call with your API engineering team.
Security Certificate
Formal certificate for compliance, customer assurance, and vendor due diligence.
FAQ
Common questions
Can\'t find what you\'re looking for? Talk to our API-security lead.
Contact usWhat is API security testing?
Spec-driven or traffic-driven testing?
Do you test GraphQL APIs?
How is API testing different from web app testing?
How long does an API security test take?
Is API testing required for RBI / PCI DSS / DPDP compliance?
Do you test mobile-app APIs?
Do you provide remediation guidance?
Test your APIs the way attackers call them.
Whether it\'s a single REST surface, a GraphQL gateway, payment APIs ahead of an RBI PA-PG audit, or a full multi-microservice scope — talk to our API-security lead.
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