API Penetration Testing Cost and Scope: What You Actually Pay For (2026)
An API penetration test in 2026 typically costs between EUR 3,400 and EUR 14,500 (roughly USD 3,700 to USD 15,700), set by the number of endpoints, the authentication and authorization logic behind them, and the depth you need. At Budget Security the basis is a transparent day rate from EUR 849/day, so a single REST API with simple auth runs 4 to 5 days and a multi-service GraphQL and REST estate with complex roles runs 10 to 17. The exact number depends on a handful of variables, and you can scope your own in minutes.
That range is wide because "API pentest" covers a 12-endpoint internal service and a 200-endpoint public platform with OAuth, tenant isolation, and webhooks. Below are the variables that move the price, real 2026 ranges by API size, and why an objective scope produces a fairer number than a padded sales estimate. If you want your exact figure in 60 seconds, our pricing calculator scopes it live.
What Drives the Price of an API Penetration Test
Three things set the day count, and the day count sets the price. There is no fixed sticker, because the number of endpoints alone never tells the full story.
1. Number of endpoints and operations
The size of the API surface is the first cost driver. A tester has to map, fuzz, and attack every route, method, and parameter. More endpoints, more HTTP methods per route, and more input parameters mean more days.
- A small API of 10 to 25 endpoints with straightforward CRUD is a 4 to 5 day job.
- A mid-size API of 40 to 80 endpoints with mixed operations runs 6 to 9 days.
- A large platform of 100+ endpoints across multiple services runs 10 to 17 days.
Endpoint count is a proxy, not the whole story. Five endpoints handling payments or document access often take longer than fifty that return static reference data.
2. Authentication and authorization complexity
This is the variable that surprises people. Broken object-level authorization and broken function-level authorization are the top API risks for a reason, and testing them properly is labor that scales with your role model, not your endpoint count.
- A single user role with token-based auth is quick to test.
- Multiple roles, tenant isolation, OAuth flows, API keys, and scoped permissions mean the tester has to verify that every role can reach exactly what it should and nothing more, across every endpoint. That is a combinatorial problem, and it adds days.
An API with 30 endpoints and five permission tiers can cost more to test than one with 80 endpoints and a single role.
3. Test type: black-box vs authenticated vs full review
What the tester starts with changes the price.
- Black-box (no credentials, attacking from the outside) is bounded but misses the authorization logic that matters most for APIs.
- Authenticated (the tester gets accounts for each role) is the standard for APIs, because most real risk sits behind login. More setup, more coverage, more days.
- Full review with API documentation, an OpenAPI or GraphQL schema, and source access lets the tester go deepest and find the most. It costs more per day of effort but finds issues a black-box test never reaches.
Picking the wrong type wastes budget. A public API needing SOC 2 evidence does not need a full source review, and a fintech API handling money is not served by an unauthenticated scan.
2026 API Pentest Price Ranges by Size
Use this as a sizing guide, not a quote. The ranges assume an authenticated test with a compliance-plus-exploitation scope, billed on a transparent day rate from EUR 849/day.
| API size | Typical scope | Days | Price (EUR) | Price (USD approx.) |
|---|---|---|---|---|
| Small (10 to 25 endpoints, single role) | One REST service, token auth, CRUD | 4 to 5 | EUR 3,400 to 4,800 | USD 3,700 to 5,200 |
| Mid-size (40 to 80 endpoints, few roles) | REST, multiple roles, some OAuth | 6 to 9 | EUR 5,100 to 8,600 | USD 5,500 to 9,300 |
| Large (100+ endpoints, complex roles) | Multi-service, tenant isolation, scoped permissions | 10 to 13 | EUR 8,500 to 11,000 | USD 9,200 to 11,900 |
| Platform (REST and GraphQL, deep auth logic) | Multiple services, OAuth, webhooks, deep exploitation | 13 to 17 | EUR 11,000 to 14,500 | USD 11,900 to 15,700 |
USD figures are approximate conversions for buyers sizing a budget in dollars and will move with the exchange rate. The day rate, not the table, is the source of truth.
For a typical SaaS product API (the most common case), expect the mid-size band: 6 to 9 days, around EUR 5,100 to 8,600. A single-role service lands at the lower end; multiple roles with tenant isolation and a real authorization-bypass objective lands higher.
These numbers sit inside the wider penetration testing cost picture, where web app, network, and cloud tests each carry their own ranges. The API test is usually one line item in that program. To pin your own figure, the calculator turns your asset list into a fixed price in about a minute.
Ready to scope your API test? Register your API assets, pick your goal, and get a fixed price with the tradeoffs shown live.
Scope and price your API pentestWhy AI Goal-Based Scoping Prices This More Accurately Than a Sales-Call Estimate
Here is the part the ranges above cannot tell you: where your API actually falls inside them.
The traditional way to find out is a sales call. A senior pentester listens to your description, makes a subjective judgment, and quotes days. That judgment carries a built-in safety margin, because the estimator is guessing and would rather over-scope than run out of days mid-test. You pay for that margin.
Budget Security replaces the guess with an objective process. You register your API assets once, then pick the asset plus the goal (API pentest, SOC 2 readiness, ISO 27001, NIS2, full exploitation) and a budget. The scoping AI proposes a test plan: how many days, what depth per area, exactly which endpoints and auth flows get tested.
Then it shows you the tradeoff live. Add a day and you see which permission tier or service gets deeper coverage. Remove a day and you see precisely what gets cut, and whether the scope still meets your stated compliance goal. If a scope no longer guarantees the SOC 2 evidence you need, it tells you why. No estimation drift, no padded margin, no "contact sales" black box.
The test itself is run by OSCP-certified people, around 30 of them, with years of working history together. We kept the caliber of a premium consultancy and replaced the delivery model. Results come through a dashboard with an issue tracker, re-tests, and full engagement history, not an encrypted PDF that gets buried in a folder.
Transparent pricing is the consequence of that process, not a discount. Objective scoping removes over-scope waste, the platform removes project-management overhead, and self-serve removes the sales cycle. The fair price falls out of removing those costs.
What a Thorough API Pentest Actually Covers
When you pay for an API test, the day count buys coverage of the issues that matter most for APIs:
- Broken object-level authorization: can one user read or change another user's data by changing an ID?
- Broken function-level authorization: can a low-privilege role call admin-only operations?
- Authentication weaknesses: token handling, session logic, OAuth flow flaws, key leakage.
- Excessive data exposure: endpoints returning more than the client should ever see.
- Injection and input handling: across every parameter, header, and body field.
- Rate limiting and resource abuse: can the API be hammered or drained?
- Business logic flaws: sequences of valid calls that produce an invalid outcome.
A scan finds the shallow issues. The day count on a real test is what buys the authorization and business-logic testing a scanner cannot do.
Get Your Exact Number
You do not have to guess where your API falls in the ranges above. Register your API assets, pick your goal, and the scoping engine builds the plan and the price in minutes, with the tradeoffs shown live.