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chore(pricefeed) Add docs for cross rate#729
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jayantk
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Jun 23, 2025
| "use-real-time-data": "Use Real-Time Price Data", | ||
| "fetch-price-updates": "Fetch Price Updates", | ||
| "schedule-price-updates": "Schedule Price Updates", | ||
| "combine-two-price-feeds": "Combine Two Price Feeds / Derive a Cross Rate", |
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just pick one of these titles -- this is too long.
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imo "derive cross rate" is better than the other one
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| # Combine Two Price Feeds / Derive a Cross Rate | ||
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| This guide shows how to combine two price feeds to derive a cross rate. These are also known as "synthetic" price feeds. |
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why is this called a synthetic feed? no need for new terminology here imo
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Alot of folks asked us if we support synthetic feeds. It helps us with SEO and docs internal search as well.
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| ## Derive a cross rate | ||
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| Pyth provides [`deriveCrossRate`](https://github.com/pyth-network/pyth-crosschain/blob/main/target_chains/ethereum/sdk/solidity/PythUtils.sol#L77) function to combine two price feeds. |
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Pyth here is imprecise. this should say
The Pyth Solidity SDK provides ...
| PythStructs.Price memory ethUsd = pyth.getPriceNoOlderThan(ethUsdId, 60); | ||
| PythStructs.Price memory eurUsd = pyth.getPriceNoOlderThan(eurUsdId, 60); | ||
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| // Derive ETH/EUR = ETH/USD ÷ EUR/USD |
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| - `crossRate`: The computed cross rate (a / c), scaled to targetExponent. | ||
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| ### ⚠️ Things to Keep in Mind |
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imo this should go after the example
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