Opens every revealed, unopened box, by box type, repeating a type while each venue call opens more. Returns the boxes this call opened and their rewards. A venue failure after earlier calls succeeded returns 502; what was done stays done and retrying is safe.

Error shape. Minimal {"error": "...", "code": "..."} (OrderSimpleErrorResponse). Rate limited at 20 requests/minute per user (bucket predictfun-lootbox, shared by the overview, box list, and bulk reveal/open/claim routes), fail-closed. Auth. API keys and delegations need trade:execute (a cold venue session is minted by signing a login challenge with the user's wallet) and the predictfun platform access flag.