API security for iGaming platforms and integrations
A modern gambling platform is a mesh of APIs: player wallets, game aggregators, payment providers, identity checks and odds feeds. Each API that moves balances or personal data needs authorization checks on every request. The OWASP API Security Top 10 2023 is the standard checklist.
The OWASP API Security Top 10 2023 for gambling platforms
| Risk | Gambling example | Control |
|---|---|---|
| API1:2023 Broken Object Level Authorization | Changing a wallet or bet ID in a request returns another player's data. | Authorize every object access against the authenticated player server-side. |
| API2:2023 Broken Authentication | Login or token endpoints without rate limits. | Strong token handling, rate limits, MFA where appropriate. |
| API3:2023 Broken Object Property Level Authorization | A profile update accepts a "verified" or "VIP" field from the client. | Allow-list writable fields; never trust client-set status. |
| API4:2023 Unrestricted Resource Consumption | Unbounded requests to odds or game-history endpoints. | Quotas, pagination limits and timeouts. |
| API5:2023 Broken Function Level Authorization | Player tokens reach back-office functions such as manual balance adjustment. | Separate admin APIs; role checks on every function. |
| API6:2023 Unrestricted Access to Sensitive Business Flows | Scripts mass-claiming sign-up bonuses or free spins. | Business-flow rate limits, device and identity checks; see bot mitigation. |
| API7:2023 Server Side Request Forgery | A webhook or avatar URL field fetches internal resources. | Validate and restrict outbound URLs. |
| API8:2023 Security Misconfiguration | Verbose errors or open debug endpoints in production. | Hardened configuration and automated checks. |
| API9:2023 Improper Inventory Management | Old API versions left running for a retired app. | Inventory of every API, version and owner; retire old versions. |
| API10:2023 Unsafe Consumption of APIs | Trusting a game provider's callback without verifying it. | Authenticate and validate supplier callbacks like any external input. |
Wallet and transaction APIs
APIs that change balances deserve the strictest design: server-side authorization on every call, idempotency keys so a retried request cannot double-credit, signed messages between platform and game provider, and reconciliation that would expose any mismatch. Treat game provider callbacks that credit wins as untrusted until their signature and transaction reference are verified.
Third-party integrations
Game aggregators, payment providers and identity services all connect by API. Agree authentication methods, key rotation, IP allow-lists where practical, and incident contacts in the contract, and test what happens when a supplier is down or returns bad data. Our vendor risk guide covers the assurance side.
Testing and monitoring
- Include authorization tests (can player A reach player B's objects?) in automated test suites.
- Commission independent security testing of APIs; several gambling regulators require periodic security audits, covered on our security rules pages.
- Log authentication failures, authorization denials and unusual call volumes, with alerting.
Questions about API security
What is the most common API vulnerability?
OWASP ranks Broken Object Level Authorization (API1:2023) first: APIs that do not check whether the caller may access the specific object requested, such as another player's wallet.
Which OWASP API risk covers bonus abuse by bots?
API6:2023, Unrestricted Access to Sensitive Business Flows, which covers automated abuse of legitimate flows such as claiming promotions.
Sources
- OWASP, Top 10 API Security Risks 2023
- All sources checked 24 October 2026.