New Utility in Pyth EVM Contracts: Combine Price Feeds to derive Cross Rates

Announcements
1

We just added a new helper to the pyth-sdk-solidity — deriveCrossRate() — to make it easier to calculate synthetic prices or cross rates like ETH/EUR, SOL/BTC, etc., using existing Pyth feeds.

This is helpful when Pyth doesn’t directly publish a trading pair you’re interested in — but you can derive it using a ratio of two prices.

:package: What’s new

You can now compute a price like:
ETH/EUR = ETH/USD / EUR/USD

:gear: Onchain, using this:

int64 crossRate = PythUtils.deriveCrossRate(
    price1, expo1,
    price2, expo2,
    targetExponent
);

:open_book: Docs: Derive Cross Rates

:brain: Bonus: The SDK also includes overflow protection, rounding logic, and edge case handling.

You can see a full working example in our docs here.

3

What if I want to do combine prices on the front end, is there any way to do this?

4

If you want to combine price feeds on front end, you can just divide the two prices.
(ETH/USD) / (BTC/USD) = ETH/BTC.