The Moz DA/PA/Spamscore API provides access to domain and page authority metrics that help evaluate a website’s SEO strength and backlink quality. It returns data such as Domain Authority (DA), Page Authority (PA), and Spam Score, which indicate how well a site or page is likely to rank on search engines and the potential risk of spammy link profiles. The API is commonly used for link analysis, competitor research, and domain evaluation in SEO tools and dashboards.