API hunting is the defensive review of logs, traces, and request patterns for signs that attackers are probing application endpoints. Security teams look for unusual methods, repeated parameter changes, odd path values, authentication bypass attempts, or requests that do not match normal user behavior. The goal is to spot exploitation attempts early, especially against high-value services such as developer platforms, identity systems, and web applications exposed to the internet.
This matters because many modern attacks begin with an API request, not a malware file. A path traversal, file-read, injection, or authorization flaw often leaves a visible trail in endpoint logs before any deeper compromise occurs. In practice, API hunting helps defenders confirm whether a vulnerable service is being targeted, narrow the time window of exposure, and collect evidence for containment. It also supports threat hunting after patching, when teams need to check whether suspicious requests reached sensitive routes or returned unexpected data.