> 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/reth.md).

# rETH

rETH is Rocket Pool's non-rebasing staked-ETH token. No direct rETH/USD Chainlink feed is used; this `ICustomPriceFeed` adapter combines the protocol's own exchange rate with the NAV's primary ETH/USD price. An independent [cross-rate](/funds/infrastructure/onchain-accounting/price-feeds/cross-rate.md) **monitor** feed (`ETH/USD × rETH/ETH`, market `rETH/ETH` leg) is registered as a [divergence monitor](/funds/infrastructure/onchain-accounting/price-feeds.md#primary-feed-and-divergence-monitors) — a market depeg flags rETH `irregular` without moving its price.

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

***

## Approach

`getExchangeRate()` × ETH/USD.

<figure><img src="/files/wSMOzIITfn9S7eQBKWio" alt="Left-to-right flowchart of the rETH price feed: rate and Chainlink inputs combine into a USD price, with a staleness gate."><figcaption><p>rETH 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 = getExchangeRate() (18) × (ETH/USD) (8) / 1e18      // USD, 8 dec
```

| Input             | Source                                                  | Description                      |
| ----------------- | ------------------------------------------------------- | -------------------------------- |
| `getExchangeRate` | `IrETH.getExchangeRate()` on rETH (18 dec)              | ETH backing 1 rETH               |
| ETH/USD           | **NAV base** — `getPriceDataNoDivergence(WETH)` (8 dec) | the NAV's primary WETH/USD price |

`getExchangeRate()` is Rocket Pool's canonical rETH/ETH ratio, updated on-chain by the protocol's oracle network and increasing as staking rewards accrue. Output decimals are inherited from the ETH/USD feed (8).

***

## Constructor

```solidity
constructor(
    address rEth_,
    address nav_,
    address baseAsset_
)
```

| Parameter    | Description                                                                                |
| ------------ | ------------------------------------------------------------------------------------------ |
| `rEth_`      | rETH token address (also the supported underlying)                                         |
| `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 `getExchangeRate()` 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 `getExchangeRate()` rate call has no independent heartbeat.

***

## Chains

Deployed on **Ethereum**.


---

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