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Here, a keyword is a search term that users actually type into the Google or Naver search box. This API retrieves the demand and competition for those terms (average monthly search volume, SEO difficulty, CPC, search intent) and provides the related keywords and autocomplete suggestions derived from a single seed keyword. Google metrics come from Google Ads data, and Naver metrics come from Naver Search Ads data. How visible your brand is in AI answers is covered by the statistics API. The keyword API sits upstream of it: you need to know which search terms have demand and how competitive they are before you can decide what content to create so that AI models cite it.

Google vs Naver

metrics and trend accept multiple keywords, so they are POST requests that carry the keywords in the request body to avoid URL length limits. related and suggestions take a single seed keyword, so they are GET requests. Metrics can be empty. If metrics is null, there is no data for that keyword. If metrics is present but searchVolume is null, the keyword belongs to a restricted Google Ads category such as healthcare or finance, and its search volume is not disclosed. For Naver, when search volume is very low, pcBelowThreshold or mobileBelowThreshold comes back true and the exact figure is omitted. See the Keyword data guide for real examples and interpretation.