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

# What is USDB？

**USDB** is a decentralized, **over-collateralized** stablecoin issued by Bucket on **Sui**, designed to track **$1** USD and power capital-efficient leverage and liquidity across the ecosystem.

USDB serves two distinct user needs:

* **Volatile-asset holders** borrow USDB against collateral to loop exposure (long-term leverage) or access liquidity without selling core positions.
* **Stablecoin allocators** avoid asset volatility while earning yield by holding USDB and depositing into the **sUSDB Savings Pool**.

***

### How to get USDB

#### Via CDPs (borrow)

Open a single-asset CDP, post supported collateral, and **borrow USDB**—typically for leverage or liquidity without selling the core asset.\
\&#xNAN;*Details: see **“How CDPs Work”***

#### Via the PSM ( Stablecoins → 1:1 mint USDB)

Swap supported stablecoins to **USDB** through the **Peg Stability Module (PSM)** at 1:1 (not included fees). Ideal for stablecoin allocators who want USDB without touching volatile assets.

**Supported assets & fees**

| Direction           | Asset         | Fee       |
| ------------------- | ------------- | --------- |
| PSM IN (Mint USDB)  | USDC          | **0%**    |
| PSM IN (Mint USDB)  | USDT          | **0.05%** |
| PSM OUT (Burn USDB) | All supported | **0.30%** |

*Peg behavior, routing, and scenarios: see **“USDB Peg”***

***

### Where to earn on USDB

Deposit USDB into the **sUSDB Savings Pool** for **competitive, flexible yield** with **real-time accrual** and **flexible redemption**.\
\&#xNAN;*Details: see **“sUSDB and Yield.”***