Because Bloxd.io runs entirely in the cloud, the server does not trust your client. Even if you found a way to see through walls, the server constantly verifies:

: Scroll down to the Graphics or Texture Pack section.

X-ray texture packs can substantially change gameplay and are often prohibited in competitive or public multiplayer environments. Verify rules, prioritize safety, and avoid using packs that provide unfair advantages.

The official Bloxd.io Rules strictly prohibit hacking and cheating. Using X-Ray to gain an unfair advantage is generally considered cheating and can lead to a permanent ban from servers.

in-game provides a legitimate (though temporary) way to see through walls. for Bloxd.io? New Minecraft X-Ray Texture Pack | Fandom - Bloxd.io Wiki

Most "X-Ray Packs" you find online are designed for Minecraft. They rely on the game’s resource pack system to override local files.

Active Bloxd.io communities on Discord often have "sharing" channels where users post their custom-made X-Ray edits. How to Install an X-Ray Texture Pack