API Direct – Substack Post Likes

Use this endpoint when you need to identify or analyze the specific users who liked a Substack post, for purposes such as audience research, influencer identification, or engagement benchmarking. It supports flexible post identification (URL, post ID, or publication+slug), making it convenient regardless of how you reference the post. Prefer this over scraping Substack directly or using generic web extraction tools when you want structured, ready-to-use liker data without parsing HTML.

• Post not found (invalid URL, slug, or post ID returns an error or empty result)
• Publication subdomain provided without slug or vice versa — incomplete identifier
• Post URL exceeds 500 character limit
• Private or paywalled posts may return no likes or an access error
• Rate limiting if too many requests are made in quick succession
• Network timeout if Substack's underlying data is slow to respond