> 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/ldo.md).

# LDO

Custom price feed for the **Lido DAO governance token (LDO)**. No direct LDO/USD feed exists, so the price is composed from a Chainlink LDO/ETH feed and the NAV's own ETH/USD base price.

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

***

## Approach

Chainlink LDO/ETH × NAV base ETH/USD (`getPriceDataNoDivergence(WETH)`)

{% hint style="info" %}
The base/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 %}

<figure><img src="/files/xriN6NAut4VV8L4lPjeG" alt="Left-to-right flowchart of the LDO price feed: rate and Chainlink inputs combine into a USD price, with a staleness gate."><figcaption><p>LDO price feed — how its oracle inputs compose into a USD price, with the staleness gate.</p></figcaption></figure>

***

## Price calculation

```
price = (LDO/ETH) × (ETH/USD) / 10^(LDO/ETH decimals)
```

| Input     | Source                                              | Description                     |
| --------- | --------------------------------------------------- | ------------------------------- |
| `LDO/ETH` | Chainlink LDO/ETH feed (`latestRoundData`)          | LDO price in ETH (18 dec)       |
| `ETH/USD` | NAV base — `getPriceDataNoDivergence(WETH)` (8 dec) | the NAV's primary ETH/USD price |

The LDO/ETH leg is a Chainlink feed; the ETH/USD leg is the NAV's primary base price. The divisor is `10 ** ldoToEth.decimals()`. Output is **8 decimals** (inherited from the ETH/USD leg via `_decimals`).

***

## Constructor

```solidity
constructor(
    address ldo_,
    address ldoToEthChainlinkAddress_,
    uint256 ldoToEthChainlinkHeartbeat_,
    address nav_,
    address baseAsset_
)
```

| Parameter                     | Description                                                                                |
| ----------------------------- | ------------------------------------------------------------------------------------------ |
| `ldo_`                        | LDO token address (the supported underlying asset)                                         |
| `ldoToEthChainlinkAddress_`   | Chainlink LDO/ETH aggregator                                                               |
| `ldoToEthChainlinkHeartbeat_` | Staleness window (seconds) for the LDO/ETH feed                                            |
| `nav_`                        | NAVCalculator (proxy) — supplies the base asset's USD price via `getPriceDataNoDivergence` |
| `baseAsset_`                  | The registered base asset whose USD price is read (WETH)                                   |

***

## Staleness

The LDO/ETH heartbeat is checked directly. `getLatestPrice()` returns `stale = true` if the LDO/ETH feed satisfies `block.timestamp − updatedAt ≥ heartbeat`, if either leg's answer is `≤ 0`, if the LDO/ETH `updatedAt` is in the future (clamped to `block.timestamp`), 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 feed. The reported `updatedAt` is the **older** of the two legs.

***

## Chains

Deployed on **Ethereum**.


---

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