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

# Introduction

sUSDb and sLITb are the two yield-bearing assets at the core of Brighter — a protocol that tokenizes Lighter's LLP yield and LIT staking into composable, transferable positions on Ethereum.

***

## The two assets

### sUSDb — the LLP yield asset

sUSDb is a yield-bearing asset minted with USDC and powered by Lighter's LLP. Underlying funds are deployed into the LLP, and returns are not paid out as a rebase — they accumulate in the sUSDb/USDC exchange rate. The number of tokens you hold never changes; what each sUSDb redeems for moves with vault performance.

The value of sUSDb is **driven by vault performance, not pegged to the dollar**: the exchange rate rises when the LLP is profitable and falls when it takes losses. The non-rebasing design lets sUSDb behave like any standard ERC-20 — hold it, transfer it freely, and keep the door open for future DeFi composability.

### sLITb — liquid staked LIT

sLITb is the liquid staking token for LIT. Stake LIT to mint sLITb, and a single position accrues two yield streams at once:

* **Lighter native staking rewards** — your staked LIT keeps earning Lighter's native rewards
* **Capacity rent** — your stake, once activated at settlement, opens deposit capacity for the protocol, paid for by the sUSDb side at a rate dynamically priced by utilization

Traditional staking locks LIT away in a contract; sLITb keeps the same position freely transferable.

## The capacity economy

The two assets are opposite ends of one economy. Every dollar of sUSDb deposit capacity is opened by activated LIT behind sLITb (current parameter: each activated LIT provides 10 USD of capacity), and sUSDb pays rent for that capacity. Rent is currently split 15% to the protocol treasury, with the remaining 85% converted to LIT and added to sLITb backing — becoming sLITb's second yield stream. Realized returns are affected by market prices and execution. These parameters are configurable; see [Contracts & Security](/reference/contracts-and-security.md) for current values.

Pricing is left to the rent curve, which adjusts automatically with utilization: when capacity is tight, rent rises and attracts more LIT; when capacity is loose, rent falls and protects net yield on the sUSDb side. There are no manual quotas — the market structure clears itself.

## Key numbers

*Current parameters (configurable) — see the app for live values, or* [*Contracts & Security*](/reference/contracts-and-security.md) *for the current configuration.*

| Item         | Value                                         |
| ------------ | --------------------------------------------- |
| Network      | Ethereum Mainnet                              |
| Capacity     | 1 activated LIT = 10 USD of capacity          |
| Deposit gate | Deposits accepted up to 90% of total capacity |
| Settlement   | Once daily, around 07:00 UTC                  |

## What these assets are not

* **sUSDb is not a stablecoin and is not principal-protected.** Its value floats with LLP performance; the exchange rate falls during loss periods, and its long-term value can drift from 1 USDC.
* **Neither asset offers instant mint/redeem.** Mints and sUSDb redemptions are processed at the daily settlement and require a manual claim; sLITb unstakes lock the amount on submission, then carry a multi-day claim timer and a manual claim.
* **Brighter is currently invite-only.** Your first mint requires an access code to unlock your wallet (once per address).

## Get started

* Get sUSDb → [Quick Start: Mint sUSDb](/welcome/quick-start-mint-susdb.md)
* Get sLITb → [Quick Start: Mint sLITb](/welcome/quick-start-mint-slitb.md)
* Read the risks first → [Key Risks](/welcome/key-risks.md)

{% hint style="info" %}
**Key takeaway**: sUSDb packages LLP yield into a composable yield asset; sLITb turns LIT staking into a liquid position earning two yield streams. Rent connects the two into a self-balancing capacity economy.
{% endhint %}