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What’s really behind your casino ui

API Security Testing

We test the APIs connecting your systems and third parties to uncover weaknesses in access, data exchange, and business logic.

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Pixel-art illustration: API Security Testing
Why this matters for iGaming

Lock the Front Door, Leave the Service Entrance Open

An iGaming platform is really a network of APIs wearing a UI. The player app, the game aggregator, the payment provider, the KYC vendor, the affiliate tracker, the odds feed, and for crypto-enabled operators the wallet and on-chain integrations all talk to each other over API calls. For your B2B partners, the API often is the product, with no interface in between at all.

That makes the API layer a target in its own right, with failure modes the UI never has to deal with. A capable attacker doesn't bother with your carefully hardened front end; they go straight to the endpoint behind it, where the assumptions tend to be weaker: an authorization check that assumes every call comes from your own app, a wallet endpoint with no throttling, a webhook that trusts whatever payload lands in it.

What we assess

Everything That Talks Over the Wire

Coverage spans REST, GraphQL, and real-time interfaces, tested as the machine-facing surface they are rather than as an extension of the UI.

Authorization

Object- and function-level access control: whether one player's session can be made to reach another player's data, balance, or actions.

Authentication

How tokens are issued, validated, and expired, and how services authenticate to each other behind the scenes.

Rate limiting and abuse

Brute force, enumeration, and automated abuse against endpoints that touch money or bonus balances.

Data exposure

Responses that return more than the client needs: internal fields, other users' data, financial or identity detail that never should have left the server.

Input validation and injection

Validation at the endpoint level, including mass assignment and parameter tampering an attacker can use to reach a field they shouldn't touch.

Business logic over the API

The same withdrawal, bonus, and bet-settlement abuse a UI-level test would look for, reached directly through the endpoint instead.

Integration and webhook security

Trust and validation on provider, payment, and partner callbacks, including on-chain event confirmations for platforms with blockchain components.
In practice

Five Ways an Endpoint Gets Broken

Each engagement is built around specific, business-critical questions rather than a generic endpoint scan. Illustrative of what a GameGuardz assessment targets:

/01

Can a request reach data that belongs to someone else?

The most common serious API flaw: swap an ID in a request and the response returns another player's balance, profile, or documents.
/02

Can the wallet be reached without going through the UI?

Endpoints that touch money get tested for authorization and throttling gaps that would let an attacker move faster than any interface would allow.
/03

Can a webhook be faked or replayed?

Payment and provider callbacks, including on-chain confirmations for crypto-enabled platforms, get checked for whether a forged or replayed event can fake a deposit or a game result.
/04

Does the response say more than it should?

Endpoints get checked against what they actually return versus what the client displays, surfacing internal flags and other users' fields sitting in the payload.
/05

What's still live that nobody's testing?

Undocumented and legacy endpoints get mapped and probed alongside the current API surface, since they're reachable whether or not they're on anyone's list.
Our methodology

Full Surface, Senior Judgment

A methodology built to hold up against engineers who know exactly what their endpoints are supposed to do. Our coverage extends to broken object- and function-level authorization, broken authentication, excessive data exposure, mass assignment, missing rate and resource limiting, server-side request forgery, injection flaws, weak webhook validation, and business logic that can be abused directly through the API. All testing takes place against a non-production environment (or one agreed with your team in advance), operating under clearly defined rules of engagement.

Map the real surface first

Documented, undocumented, and legacy endpoints all get enumerated, because an endpoint nobody wrote down is still reachable.

Tested across every role

Player, tiered, service, and admin tokens are all used in testing, surfacing the authorization gaps that only show up between roles.

AI-directed coverage at scale

Researchers direct AI to help map and probe large endpoint sets, extending coverage across surface area that would take far longer to reach manually — while judgment on what actually matters stays with the researcher.

Framework-aligned

Testing maps to recognized references such as the OWASP API Security Top 10, covering broken object- and function-level authorization, broken authentication, excessive data exposure, mass assignment, missing rate limiting, SSRF, injection, webhook validation gaps, and business-logic abuse reached through the API.

Blockchain-aware where it applies

For platforms with crypto rails, testing extends to how APIs interact with wallet services and on-chain components, not just the traditional payment stack.
Scope

The Endpoints Where Money and Identity Actually Move

Coverage is agreed with your team before testing starts, weighted toward the endpoints that matter most.

What the engagement covers

  • Player-facing APIs — the endpoints behind your web and mobile clients
  • Wallet and payment APIs — deposits, withdrawals, balances, and transaction handling
  • Integration APIs — game providers, aggregators, payment processors, KYC, affiliates
  • Webhooks and callbacks — inbound event and confirmation handling, on-chain included
  • Back-office and admin APIs — privileged endpoints behind operator tooling
  • B2B and partner APIs — the endpoints you expose to your own customers

WHAT YOU RECEIVE

  • Findings tied to the specific endpoint, request detail, and business impact
  • Reproduction requests your engineers can replay directly
  • Prioritized, endpoint-level remediation guidance
  • Executive summary on API-layer exposure
  • Retesting against the fixed endpoints, included in the engagement
Why GameGuardz

We Know What Sits Behind the API

  • A scanner can map endpoints and return generic findings. GameGuardz brings iGaming context to that surface, knowing which APIs handle bets, bonuses, payments, player identity and wallet interactions across the platform.
  • That context directs testing toward the endpoints that matter most, connecting technical weaknesses to real platform functions and giving your engineers clear, reproducible evidence of what needs attention and why.
Faq

Questions we get asked.

A web app test is scoped around what a user experiences through the browser. API testing goes straight at the endpoints underneath it, including the ones no UI ever calls, where authorization and rate-limiting gaps tend to live.

Both. Testing covers REST, GraphQL, and real-time interfaces, scoped to whatever your platform actually runs on.

Yes, where access and permission allow it, provider, aggregator, payment, and KYC integrations are typically in scope since that's often where the real risk sits.

It helps but isn't required. Part of the engagement is mapping the surface that exists, including endpoints your own documentation may have missed.

Methodology maps to the OWASP API Security Top 10, adapted to the business logic and data flows specific to iGaming platforms

Yes, for platforms with blockchain rails, wallet-service and on-chain interaction points at the API layer are assessed alongside the rest of the surface.

Tell us which endpoints move money on your platform.

A short call is enough to map your API surface and prioritize the endpoints worth testing first.

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