Gapup Content Similar Works Recommendation

Use this endpoint when you need content-to-content similarity recommendations grounded in tag overlap and audience profile data, specifically for works or franchises already catalogued in the Gapup content catalog. Prefer it over keyword search when you want recommendations based on holistic similarity rather than title or description matching. Best suited for recommendation pipelines, editorial discovery, or user-facing 'more like this' features.

• Invalid or unknown entity_id returns an error or empty results
• entity_type mismatch (e.g. passing a franchise ID as a work) may return irrelevant or no results
• limit out of range (below 1 or above 30) returns a validation error
• Async mode returns a job_id that must be polled separately — forgetting to poll yields no result
• Payment failure (x402) blocks the call entirely