API
Application Programming Interface
API is a set of rules and methods through which programs exchange data and commands. In gambling, crypto and payments, APIs connect payments, games, KYC and trackers.
What is API (Application Programming Interface)?
Application Programming Interface (API) is a defined set of endpoints, request methods and data formats through which one program accesses the functions of another. Most often the exchange runs over HTTP(S) in JSON or XML format.
## How it works
The client sends a request with parameters and an authorization key, and the server returns a response with a status code and data. Common styles include REST, GraphQL and SOAP. Webhooks are a separate mechanism: the server itself sends an event to a specified URL when something happens, such as a payment status change.
## Where it is used in high-risk verticals
In gambling and betting, an API connects a site or app with a game provider platform, an odds feed, a player verification system and a payment gateway. In crypto, it connects with exchanges, instant exchangers and blockchain nodes for withdrawals. In fintech and payments, it connects with PSPs and banks. In dating and nutra, it connects with CRMs, trackers and ad accounts.
## What it affects
The quality of the integration determines registration and deposit speed, the share of successful payments (approval rate), the accuracy of conversion attribution and the funnel's resilience to failures. Rate limits and API version changes without notice can suddenly halt the flow of traffic or payouts.
## Common mistakes
Storing API keys in client-side code or in a repository; not verifying webhook signatures; ignoring repeated events without idempotency; lacking logging of responses and timeouts. Keys should be issued with minimal permissions and rotated regularly.
FAQ
How is an API different from an SDK?
An API is a set of rules for accessing a service over the network. An SDK is a ready-made set of libraries and tools, often built on top of an API, for embedding into an application. An SDK simplifies the work but does not replace understanding the API itself.
What is an API key and why is it needed?
It is a secret string that tells the service who is making the request, and it applies access rights and limits. It must not be published or shared with third parties unless necessary.
Can you work without an API?
Yes, manually or through file exports, but with high transaction volumes this is slow and increases the risk of errors, which is why high-risk businesses usually rely on API integrations.