Stack Overflow API quota limits for authenticated versus anonymous requests

API Rate Limit Behavior

The Stack Overflow API implements tiered rate limiting to manage traffic across its endpoints. While the API provides headers such as X-Api-Quota-Limit and X-Api-Quota-Remaining to track usage in real-time, the specific thresholds differ based on the authentication method used for the request.

Quota Constraints

There is a documented distinction between unauthenticated requests and those utilizing an OAuth token. However, the exact delta in daily request quotas and the behavior of the API when transitioning from an anonymous state to an authenticated state during a single session remains unclear.

• Impact of OAuth tokens on the daily request ceiling.
• Consistency of quota resets across different authentication tiers.

What are the specific daily request limits for unauthenticated clients compared to OAuth-authenticated clients? Does the API apply a separate IP-based limit in addition to the token-based quota?