Custom Eaglercraft clients come with built-in cheat menus. These clients are modified versions of the main game repository and feature a dedicated Toggle-GUI.
Mine plenty of regular stone, iron, and coal to make your player data look like that of a legitimate survival player.
While using X-Ray in single-player mode is completely harmless, using it on multiplayer Eaglercraft servers comes with massive risks. Modern Eaglercraft servers utilize advanced server-side anti-cheat plugins (like Advanced Anti-Cheat or Matrix) to catch cheaters. How Servers Detect X-Ray: