> For the complete documentation index, see [llms.txt](https://layer3xyz.gitbook.io/layer3-updated-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://layer3xyz.gitbook.io/layer3-updated-docs/platform/cubes.md).

# CUBEs

## What are CUBEs?

A CUBE (**C**redential to **U**nify **B**lockchain **E**vents) is an NFT minted when you complete an Activation. Each CUBE records the apps, chains, and actions behind it, turning your activity into a portable, verifiable onchain credential.

Over **70 million CUBEs** have been minted to date.

## Why CUBEs matter

CUBEs are your qualification layer on Layer3:

* **Proof of impact**: your onchain history, unified into credentials you own.
* **Access**: your CUBE collection feeds the profile that determines which [Perks](/layer3-updated-docs/platform/perks.md) you qualify for and which gated Activations you can enter.
* **Rewards**: CUBEs count toward token claims and reward progression across the platform.

CUBEs are minted on low-cost chains (EVM and Solana supported), so credentialing your activity stays affordable. All popular wallets and NFT marketplaces display them natively.

## Why is there a small fee to mint?

CUBEs are real onchain tokens. Minting one writes your credential to the blockchain, which carries a small network fee. That's what makes a CUBE verifiable and yours.

And with [Liquid Rewards](/layer3-updated-docs/platform/rewards-and-progression.md#liquid-rewards), each mint earns you L3 back instantly, up to 100% of the mint cost depending on your tier.

{% hint style="info" %}
CUBE smart contracts are audited. For audits and protocol-level details, see the [Layer3 Foundation docs](https://docs.layer3foundation.org).
{% endhint %}