How do you ensure API use complies with Reddit's policies?

Compliance with Reddit's API policies requires understanding both the technical rules — rate limits, authentication requirements, content restrictions — and the broader behavioral policies that govern how API-connected applications interact with the platform and its users. The starting point is reading and periodically reviewing Reddit's API Terms of Use and the Reddit Developer Terms, both available at reddit.com. These documents specify what data can be accessed, how it can be used, what constitutes commercial use, and what categories of applications are prohibited. The policies have been updated significantly since 2023 and should not be assumed to be stable — subscribing to r/redditdev and monitoring the official developer blog ensures you are notified when policy changes occur. Rate limit compliance is a technical prerequisite for all API use. Implementing proper rate-limit handling — reading the rate limit headers in each response, implementing exponential backoff on 429 errors, and avoiding burst traffic that exceeds the per-minute limit even within the rolling average window — is both a policy requirement and a practical necessity for application stability. Most Reddit API libraries, including PRAW for Python, handle rate limiting automatically if configured correctly. The User-Agent header requirement is non-negotiable. Every request must include a User-Agent string in the format `platform:application_name:version (by /u/reddit_username)`. Applications with generic or missing User-Agent strings are treated as potential abuse and are subject to throttling or blocking regardless of whether they otherwise respect rate limits. NSFW content restrictions, data retention limitations (Reddit prohibits storing certain categories of data indefinitely), and the prohibition on using API data to train machine learning models without explicit commercial agreements all represent policy compliance requirements beyond rate limits. For commercial applications — those embedded in paid products or services — engaging Reddit's developer relations team proactively through the formal commercial access request process is the appropriate path, rather than assuming that free-tier access covers commercial use because the volume happens to stay within free-tier limits.