> For the complete documentation index, see [llms.txt](https://docs.kpk.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.kpk.io/funds/infrastructure/onchain-accounting/price-feeds/rseth.md).

# rsETH

rsETH is Kelp DAO's liquid restaked ETH token. No direct rsETH/USD Chainlink feed exists, so this `ICustomPriceFeed` adapter combines Kelp's rate provider with the NAV's primary ETH/USD price.

**Source:** [`rsETH_CustomPriceFeed.sol`](https://github.com/karpatkey/onchain-accounting/blob/main/src/prices/protocols/rsETH_CustomPriceFeed.sol)

{% hint style="info" %}
**Mainnet feed.** The L2 deployments use a different oracle composition — see [rsETH (L2)](/funds/infrastructure/onchain-accounting/price-feeds/rseth-l2.md).
{% endhint %}

***

## Approach

`getLatestRate()` (rate provider) × ETH/USD.

<figure><img src="/files/Ewa6ujjmmd7NWIXG7KMU" alt="Left-to-right flowchart of the rsETH (Mainnet) price feed: rate and Chainlink inputs combine into a USD price, with a staleness gate."><figcaption><p>rsETH (Mainnet) price feed — how its oracle inputs compose into a USD price, with the staleness gate.</p></figcaption></figure>

{% hint style="info" %}
The ETH/USD term is sourced from the NAV's own selector — see [Base/USD from the NAV's own selector](/funds/infrastructure/onchain-accounting/price-feeds.md#base-usd-from-the-navs-own-selector).
{% endhint %}

***

## Price calculation

```
price = getLatestRate() (18) × (ETH/USD) (8) / 1e18      // USD, 8 dec
```

| Input           | Source                                                  | Description                      |
| --------------- | ------------------------------------------------------- | -------------------------------- |
| `getLatestRate` | `IRsETHRateProvider.getLatestRate()` (18 dec)           | rsETH/ETH exchange rate          |
| ETH/USD         | **NAV base** — `getPriceDataNoDivergence(WETH)` (8 dec) | the NAV's primary WETH/USD price |

The rate comes from Kelp DAO's Multi-Chain Rate Provider, updated by Kelp's own oracle infrastructure. The rate provider address is validated only as a non-zero address (not as a Chainlink-shaped oracle). Output decimals are inherited from the ETH/USD feed (8).

***

## Constructor

```solidity
constructor(
    address rsEth_,
    address rateProvider_,
    address nav_,
    address baseAsset_
)
```

| Parameter       | Description                                                                                |
| --------------- | ------------------------------------------------------------------------------------------ |
| `rsEth_`        | rsETH token address (also the supported underlying)                                        |
| `rateProvider_` | Kelp DAO Multi-Chain Rate Provider                                                         |
| `nav_`          | NAVCalculator (proxy) — supplies the base asset's USD price via `getPriceDataNoDivergence` |
| `baseAsset_`    | the registered base asset whose USD price is read (WETH)                                   |

***

## Staleness

`getLatestPrice()` returns stale if `getLatestRate()` returns `0`, or if the NAV reports the base asset (WETH) stale — all its feeds stale. The base leg's `updatedAt` comes from the NAV's selected WETH feed. The rate provider call has no independent heartbeat.

***

## Chains

Deployed on **Ethereum**. For the rollup deployment, see [rsETH (L2)](/funds/infrastructure/onchain-accounting/price-feeds/rseth-l2.md).


---

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