ISO 9001 · ISO 27001 · ISO 20000 certified CERT-In aligned security audits

REST, GraphQL & Mobile APIs

API Security Testing & API Penetration Testing

APIs expose your data and business logic directly, and many serious breaches start there. We test every endpoint for broken authorisation, excessive data exposure, weak authentication and abuse, following the OWASP API Security Top 10.

  • Mutual NDA before scoping
  • Non-destructive testing
  • Free retest after fixes

What this covers

  • API Security Testing

Typical timeline

Most assessments take 5–15 working days; critical findings are reported within 24 hours.

Who it is for

Who our API Security Testing service is for

We work from your API documentation, Postman collections or traffic captured from your apps, then test each role and tenant boundary by hand. Findings include working requests you can replay, so your developers can reproduce and fix issues quickly.

Discuss your requirement
  • 01

    Fintech, lending and payment platforms exposing partner APIs

  • 02

    SaaS products with public or customer-facing APIs

  • 03

    Mobile app companies whose backend APIs power the app

  • 04

    Enterprises integrating many third-party services

Capabilities

What is included in API Security Testing

Broken object-level authorisation (BOLA/IDOR)

Systematic checks that no user or tenant can read or change data belonging to another.

Authentication & token security

JWT, OAuth 2.0 and API key handling, token expiry, refresh flows and signature validation.

Rate limiting & abuse testing

Brute force, enumeration, OTP abuse and resource exhaustion checks on sensitive endpoints.

Data exposure & mass assignment

Responses that return more data than needed and requests that update fields they should not.

GraphQL & webhook testing

Introspection, query depth, batching attacks and webhook signature verification.

Retest & API security checklist

A free retest after fixes plus a checklist your team can apply to new endpoints.

How we work

A clear, step-by-step delivery process

You always know what happens next, who is responsible and what you will receive at each stage.

Typical timeline

Most assessments take 5–15 working days; critical findings are reported within 24 hours.

  1. 01

    Scoping & NDA

    Assets, roles, test windows and rules of engagement are agreed in writing.

  2. 02

    Reconnaissance

    We map the attack surface: endpoints, parameters, integrations and exposed services.

  3. 03

    Manual testing

    Hands-on exploitation of logic, access control and injection flaws, backed by tooling.

  4. 04

    Reporting

    CVSS-scored findings with proof, business impact and step-by-step fixes.

  5. 05

    Retest & closure

    Fixes are verified and a closure report is issued for auditors and clients.

Deliverables

What you receive

  • Endpoint coverage matrix
  • Findings with replayable requests and CVSS scores
  • Remediation guidance for each issue
  • Developer walkthrough call
  • Retest and closure report
  • API security checklist for future releases

Methodology & tools

Tools we work with

OWASP API Security Top 10Burp Suite ProfessionalPostmanOWASP ZAPKiterunnerjwt_toolGraphQL VoyagerNucleiCVSS v3.1

We recommend tools based on your scale, budget and existing systems, not on what is fashionable. Every choice is explained in the proposal.

Engagement models

Choose how we work together

One-time assessment

A scoped test with a severity-rated report, developer walkthrough and one free retest after you fix the findings.

Most chosen

Compliance programme

Gap assessment, policy and control implementation, evidence collection and audit support across a fixed timeline.

Continuous security

Quarterly testing, release-based retests and on-call advisory for teams that ship often.

How pricing works: Security work is priced on scope: number of applications, APIs, user roles, IPs or cloud accounts. You get a fixed quote after a short scoping call. Company audits start at ₹25,000.

Get a quote

FAQs

API Security Testing: frequently asked questions

What do you need from us to test our APIs?

API documentation such as an OpenAPI or Swagger file or a Postman collection, a test environment URL and test accounts for each role. If documentation is missing, we can map the API from your web or mobile app traffic.

What is BOLA and why is it the top API risk?

Broken object-level authorisation happens when an API returns or changes a record simply because the requester supplied its ID, without checking ownership. It is easy to miss and often exposes other customers' data, which is why we test it on every endpoint.

Can you test GraphQL APIs?

Yes. We test GraphQL-specific risks such as introspection exposure, deeply nested or batched queries, field-level authorisation and injection through resolvers.

Do you test the third-party APIs we use?

We test how your system uses them: secrets handling, webhook verification and trust assumptions. Testing a provider's own infrastructure requires that provider's permission.

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Request a proposal for API Security Testing

Share a few details. A senior specialist reviews them and schedules a call to discuss scope, timeline and cost, with no obligation.

  • Written scope and fixed quote
  • NDA signed before you share sensitive details
  • Direct access to the people doing the work

By submitting you agree to be contacted about this enquiry. We never share your details.

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