Full endpoint map
Every live endpoint from your docs, schema, and app traffic, including the undocumented routes attackers find first.
The Problem
Your API Leaks Through Access Rules, Not the Login Page
Most API breaches are not broken encryption or a zero-day. They are one user reading another user's records because an endpoint skipped the check on who was asking.
Object access
An endpoint returns any record when you change the id.
Object access
We test every endpoint for access with two real accounts.
Function access
A normal token reaches an admin-only action.
Function access
We test role boundaries on each action, not just the login.
Hidden routes
Old or undocumented endpoints still answer and leak data.
Hidden routes
We map every live endpoint, including the ones off your docs.
Over-exposure
A response returns far more fields than the screen shows.
Over-exposure
We check each response for fields the client does not need.
Your API passes a scan and your login works, so it feels safe. Then someone changes an id in a request and reads another customer's invoice. An admin-only route answers a normal user token. A GraphQL query no one meant to expose walks the whole schema. Scanners miss this, because the request looks valid and the server returns a clean 200. The flaw is in who is allowed to ask, and a tool does not know your business rules. One wrong check, and your API hands data to the wrong person.
We test your API the way an attacker with a valid account would. We map every endpoint, including the ones not in your docs. Then we check each for object and function level access: can one user reach another user's records, and can a normal token hit an admin route. We test authentication, rate limits, input handling, and how much data each response returns. For GraphQL, we test introspection, nested queries, and depth. Every finding comes with the exact request to reproduce it and the fix.
Access tested first
We test object and function level access with real accounts, because that is where most API breaches actually start.
REST and GraphQL
We test REST, GraphQL, and gRPC endpoints, including introspection, nested queries, and the depth limits GraphQL needs.
Proof you can replay
Each finding ships with the exact request that triggers it, the response, a severity rating, and the fix.
Our API Penetration Testing Process
From Endpoint Map to a Ranked Fix List in Five Steps
You approve the scope and accounts, watch us test every endpoint, and see each finding proven with a request you can replay. You get a ranked fix list and a retest.
You tell us about your API: REST or GraphQL, how many endpoints, and how it authenticates. We agree the scope, a test environment, and the window, and you sign a written authorization. You get a fixed scope and price. We test only APIs you own or are authorized to test.
What's Included
What You Get With API Pentesting of Every Endpoint
You get a full endpoint map, access testing with real accounts, authentication and input checks, GraphQL tests, proof for every finding, and one retest.
Compare Options
DeveloperLook vs an Automated Scanner vs a Large Firm
An automated scanner is cheap and runs often, and a large firm carries brand weight for a formal tender. Here is where each fits an API test and where it stops.
| Feature | DeveloperLookBest fit | Automated scanner | Large firm |
|---|---|---|---|
| Starting cost | From $1,100 | Free or monthly | Quoted per engagement |
| Access testing | Two accounts, every role | Not tested | |
| Hidden endpoints | Mapped from traffic | Docs only | Usually mapped |
| GraphQL depth | Introspection and nesting | Rarely covered | Sometimes covered |
| Business logic | Tested by hand | Not understood | Tested manually |
| Proof per finding | Request you can replay | A generic alert | Report only |
| Retest | Rescan anytime | Varies by contract | |
| Best for | APIs behind real products | A quick first pass | Regulated tenders |
DeveloperLook
Automated scanner
- Starting cost
- DeveloperLook: From $1,100Automated scanner: Free or monthly
- Access testing
- DeveloperLook: Two accounts, every roleAutomated scanner: Not tested
- Hidden endpoints
- DeveloperLook: Mapped from trafficAutomated scanner: Docs only
- GraphQL depth
- DeveloperLook: Introspection and nestingAutomated scanner: Rarely covered
- Business logic
- DeveloperLook: Tested by handAutomated scanner: Not understood
- Proof per finding
- DeveloperLook: Request you can replayAutomated scanner: A generic alert
- Retest
- DeveloperLook: Automated scanner: Rescan anytime
- Best for
- DeveloperLook: APIs behind real productsAutomated scanner: A quick first pass
Projects We've Built
API-Driven Products We Have Built
We build and run the web apps, dashboards, and backends that these APIs serve, so we know how real endpoints, tokens, and roles are wired together.
Logify Project Risk and Control Management Web App
- Logistics & Transportation
- Construction
- Dashboard
Oasic Finance SaaS Web Design & Development
- Finance
- SaaS Platform
- Dashboard
Finto Corporate Website Design & Development
- Finance
- Dashboard
- Website
Moneywish Finance App Design & Development
- Finance
- Dashboard
- Mobile App
What Our Clients Say
What Clients Say After Launch
Feedback from teams we have built and secured API-driven products for.
We had a pretty specific idea of what we wanted our website to become, but I wasn’t sure how easily we could explain all of it to a development team. There were quite a few moving parts, and we were working toward a deadline, so I expected a few things to get lost along the way. That never really happened. They understood what we were trying to achieve, kept us updated throughout the process, and got everything ready within the agreed timeline. The final site feels much easier to navigate, works beautifully on mobile, and is noticeably smoother for our customers. It was a huge relief seeing the original idea actually turn into the website we had in mind.
The mobile experience is probably my favourite part of the new site. We had spent a lot of time making sure the desktop version looked right, and the team kept pushing us to think about how everything would actually feel on a phone too. They were right. The navigation is clean, the interactions feel natural, and everything we’ve tested so far works exactly as it should. They also went through the links, forms, integrations, and other details more than once before launch, which I really appreciated. And even after going live, we could still reach out when something came up. The whole process felt friendly, organised, and surprisingly straightforward.
What I appreciate most is that the website is actually easy for us to manage now. We can update content ourselves instead of sending a developer a message every time we need to change something small. They also paid attention to the technical SEO side, which mattered to us because we didn’t want a new website to create problems for the traffic we already had. I’ve probably asked more questions than I should have since launch, but every question has been handled patiently and without any fuss. The team is easy to work with, they explain things clearly, and when we need something changed, they focus on getting it done rather than making the process complicated.
1,250+
Projects shipped
10+
Years of experience
Top 3%
Upwork Top Rated Plus
5 stars
Average review score
1,250+
Projects shipped
10+
Years of experience
Top 3%
Upwork Top Rated Plus
5 stars
Average review score
Want results like these?
Tell us what you are building. You get a reply within 24 hours on business days, then a written estimate.
Work Culture
Why Engineering Teams Trust Us With an API Test
An API test touches live data and real accounts, so how we work matters as much as what we find. These habits keep the test safe and the results useful.
Authorized and in scope
We test only APIs you own or are authorized to test, under written rules of engagement. The scope, environment, and window are agreed in writing before anything starts.
We test access, not just inputs
Most API breaches are broken access, so that is where we spend the hours. We prove whether one account can reach another's data, which scanners cannot do.
We prove every finding
Each issue comes with the exact request that triggers it, so your engineers can replay it, see it for themselves, and confirm the fix worked.
We protect your data
We prefer a staging copy and test accounts over production records. When production is the only option, we agree limits and stop short of exfiltration.
We flag when a scan fits
If a scheduled scan covers your risk right now, we will tell you before we quote. A full API test should earn its cost against your real exposure.
We speak your stack
We build APIs ourselves, so we read your OpenAPI schema and your code, and our findings land as issues your team can act on, not vague alerts.
Overview
What do API penetration testing services include?
DeveloperLook provides API penetration testing services for REST, GraphQL, and gRPC endpoints. We map every endpoint, test object and function level access with real accounts, and check authentication, input handling, and data exposure against the OWASP API Security Top 10. Tests start at $1,100, take 2 to 3 weeks, and you get a reproducible request for each finding and a retest.
DEVELOPERLOOK
Project facts · API Penetration Testing Services
- Service
- Hands-on API pen test with access, auth, and data-exposure testing
- Typical timeline
- 1 to 2 weeks for one API, 2 to 3 weeks with GraphQL and multiple services
- APIs tested
- REST, GraphQL, gRPC, and webhook endpoints
- Built with
- Burp Suite, Postman, OWASP tooling, and manual testing
- Experience
- 10+ years of development experience and 1,250+ shipped projects
- Post-launch support
- 30 days of support after the report
- Communication
- Calls in US, UK, and AU business hours
- Starting price
- From $1,100 USD, fixed scope after a free scoping call
Reviewed 27 Oct 2026 by Saimul Islam
Good fit
SaaS teams exposing a public API
Your product offers a public web API to customers or partners, and you want web API penetration testing to prove one account cannot read another account's data.
Teams after a customer request
Your customer or their security team asked for an API penetration test before they sign, and you want a report their reviewers accept.
Fintech and health apps
Your mobile or web app runs on an API that moves money or health records, and you want every endpoint tested, not just the ones in your docs.
Teams shipping a GraphQL API
You moved to GraphQL and worry about introspection, deep nested queries, and a single endpoint that can reach more than you intended.
Platform teams with many services
You run microservices behind a gateway, and you want each service and its east-west calls tested, not only the public front door.
Not a fit
Full web app test
You mainly need the browser-facing app, its logins, and its checkout tested, not just the API. Our Web Application Penetration Testing Services page is the better fit.
Network, not API
Your worry is the servers, firewalls, and internal network the API runs on. Our Network Penetration Testing page targets that surface directly.
Code review only
You want a line-by-line audit of your source and dependencies, not a runtime attack. A secure code review or Application Security Assessment fits better.
Budget under $1,100
Your budget is under $1,100, or a scheduled API scan is all you need right now. A scan is a cheaper first step than a full test.
Not sure we're the right fit?
Book a free call or message us. We'll tell you honestly whether we're the right team.
Pricing
Transparent Starting Prices for API Penetration Testing
These are starting points in USD. Your price depends on how many endpoints and services are in scope and whether GraphQL is involved. You get a fixed proposal after a free scoping call.
For Agencies
White-Label API Penetration Testing for Agencies and Studios
You own the client relationship. We supply the API testing under your brand: scoped endpoint mapping, access and authentication testing, proof for every finding, and a report your account team can present. One partner for the testing, so you can offer it without hiring an API security specialist.
How the partnership works
White label: your client only ever sees your brand
Your clientSees only your brand
You, the agencyOwn the relationship
DeveloperLookBehind your brand
Share the client
You give us the API, the scope, and the rules of engagement.
- Client needs
- You share the details
- Details received
We test and prove
We map and test every endpoint and prove each finding with a request.
- Scope and plan
- Proposal to resell
- Your quoteYOUR LOGO
You present results
You deliver the report and fix order under your own brand.
- Done by our team
- Your brand on it
- Handed to your clientDone
- Your client
- You, the agency
- DeveloperLook
Share the client
You give us the API, the scope, and the rules of engagement.
- Client needs
- You share the details
- Details received
We test and prove
We map and test every endpoint and prove each finding with a request.
- Scope and plan
- Proposal to resell
- Your quoteYOUR LOGO
You present results
You deliver the report and fix order under your own brand.
- Done by our team
- Your brand on it
- Handed to your clientDone
Partner with DeveloperLookDelivered under your brand
The Right Technology for Your Project
Technology Stack
We test with the tools API testers trust and report in formats your engineers can replay and act on.
Burp Suite- Postman
OWASP- Nuclei
Python
- REST
GraphQL- gRPC
OpenAPI- Webhooks
- OAuth
- OpenID Connect
- JWT
PostgreSQL- MongoDB
Node.js
Laravel
Next.js
Firebase
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Related Services
Services buyers often add: the security hub, web app and network testing, and an application security assessment of the code behind the API.
Web Application Penetration Testing Services
DeveloperLook offers Web Application Penetration Testing Services for stores, SaaS products, and custom apps: hands-on testing of logins, roles, checkout logic, APIs, and cloud settings, with proof for each finding, a fix list, and a retest.
Application Security Assessment
DeveloperLook provides application security assessment for web and mobile apps. We review design, access control, dependencies, configuration, and data handling against OWASP ASVS, then retest your fixes. It's a software security assessment that ends in a fix list, not a scanner dump.
Network Penetration Testing Services
DeveloperLook provides network penetration testing services for offices, data centers, and cloud networks. We test every exposed service from outside, then from an assumed breach inside, and prove how far an attacker could reach.This page
API Penetration Testing Services
Pairs with the 6 services around it
Penetration Testing as a Service
DeveloperLook runs penetration testing as a service for product teams on a monthly rhythm. Each cycle is scoped from what you shipped, tested by hand, and filed as tickets in your own tools, with a quarterly report for customers and auditors.
API Development Services
DeveloperLook provides API development services for SaaS products, mobile apps, and partner platforms: REST and GraphQL APIs with authentication, versioning, tests, and OpenAPI docs. An API development company that agrees the contract with you before writing code.
Cybersecurity Services
DeveloperLook provides cybersecurity services for businesses without a security team. We assess identity, email, devices, cloud, and web apps, fix the gaps you approve, and recheck every fix, so you get a cybersecurity service provider that does the work.FAQ
Frequently Asked Questions
Straight answers on cost, timeline, what an API test covers, and how it differs from a scan.
Saimul IslamFounder & CEO, DeveloperLookStill have questions?
Send a message or book a call with the team.
API penetration testing services start at $1,100 for a single REST or GraphQL API of up to 40 endpoints. A product API with multiple roles and GraphQL runs $2,900, and a microservice platform tested service by service starts at $5,400. You get a fixed quote after a free scoping call that sets the endpoint count and whether GraphQL is in scope.
A single API pentest usually takes 1 to 2 weeks end to end, with the hands-on testing in the middle. A product API with GraphQL and several services takes 2 to 3 weeks. How long depends on your endpoint count and how many roles we test across. We retest once your team has applied the fixes, usually within 30 days.
API penetration testing is a hands-on attack on your application's endpoints that proves which flaws an attacker could use. It goes beyond a scan: a tester works through each endpoint by hand with real accounts to check who can reach what. It covers REST, GraphQL, and gRPC, and focuses on access, authentication, and data exposure.
Because your API holds your data and your business rules, and a browser does not touch it. Most API breaches come from broken access, where one valid account reads another account's records. A scanner cannot judge who should be allowed to ask, so these flaws pass automated checks. API security testing services and hands-on API pen testing are the way to catch them.
Yes, because a scan and an API test look for different things. A scan checks for known software flaws and misconfigurations. An API test checks your own access rules and logic: whether a user can read another user's data, reach an admin action, or pull more fields than intended. Those flaws are unique to your API, so no scanner can find them. Most teams run both.
We map every live endpoint from your docs, your schema, and your app traffic, so hidden routes surface. Then we test each one with real accounts against the OWASP API Security Top 10: broken object and function access, weak authentication, and data exposure. We confirm each issue by hand and give you the request to replay it.
GraphQL exposes one endpoint that can reach your whole schema, so we test it differently. We check whether introspection is open and how deep a nested query can go before it strains your server. We also test whether batching lets an attacker brute-force in bulk. We also test field-level access, since a single query can pull data from many types at once.
We prefer a staging copy with test accounts, because an API test sends real requests that write and change data. When production is the only realistic environment, we agree strict limits in writing and use dedicated test accounts. Either way, we leave live customer records in place.
Yes. Authenticated testing is where the real risk sits, so we ask for at least two accounts at each role. For a gateway or microservices, we extend the penetration testing API work to the service-to-service calls behind the gateway. We handle tokens, API keys, OAuth, and mutual TLS as part of the setup.
You do. The report, the reproducible requests, and the fix list are yours to keep and share with a customer, an auditor, or your own team. You get both an executive summary and the technical detail, plus a summary letter for a customer who asked for proof of the test.
Saimul IslamFounder & CEO, DeveloperLookStill have questions?
Send a message or book a call with the team.
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