> For the complete documentation index, see [llms.txt](https://docs.krillprotocol.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.krillprotocol.com/krill-protocol-docs/introduction.md).

# Introduction

## What is Krill Protocol?

**Krill Protocol** is a Sui-native, non-custodial yield allocation protocol. By leveraging the security of the Move execution layer, Krill transforms decentralized finance (DeFi) lending yields into an accessible, prize-linked savings infrastructure where **user principal is isolated and 100% preserved**, and only generated yields are algorithmically distributed.

{% hint style="info" %}
**Core Principle**: Deposit stablecoins. Every depositor earns yield. Withdraw anytime.
{% endhint %}

Inspired by the UK's **Premium Bonds** program—a £135B+ ($170B+) savings category validated over 70 years—Krill Protocol rebuilds yield-funded savings for the stablecoin era.

***

## Key Highlights

* 🛡️ **Principal Isolation**: User principal is routed directly to audited 3rd-party Sui lending markets (Suilend, NAVI, Scallop, AlphaLend) and remains 100% recoverable at all times.
* 🎁 **10-Tier All-Receive Model**: Every single depositor automatically receives a baseline allocation (22%) of generated yield, ensuring no participant suffers a loss.
* ⚡ **Native Sui Randomness**: Powered by `sui::random` VRF at consensus level—providing zero-cost, tamper-proof, on-chain randomness without third-party oracle fees.
* 🔒 **Trust by Code**: 5 immutable safety constraints enforced at the Move type-system level—eliminating custodial risk, lockup periods, and arbitrary admin clawbacks.

***

## Krill Protocol at a Glance

| Parameter                   | Specification                                                         |
| --------------------------- | --------------------------------------------------------------------- |
| **Supported Chain**         | Sui Mainnet                                                           |
| **Supported Assets**        | USDC, USDT (Phase 1) → USDsui, yield-bearing stablecoins (Phases 2-4) |
| **Principal Fee**           | **0%**                                                                |
| **Protocol Revenue**        | 10% Fee on Generated Yield Only                                       |
| **Withdrawal Delay**        | 0 Instant / Single Transaction                                        |
| **Underlying Yield Source** | Integrated Sui Lending Adapters (Suilend, NAVI, Scallop, AlphaLend)   |


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