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What Is the Difference between an On-Chain and Off-Chain Data Source for an Oracle?

Off-chain data is external (CEX price, API); on-chain data is native to the blockchain (wallet balance, DEX transaction data).
Greeks.Live20.11.25

What Is the Difference between an On-Chain and Off-Chain Data Source for an Oracle?

An off-chain data source is any data existing outside the blockchain, such as a price from a CEX or a weather API. An on-chain data source is information already present on the blockchain itself, like the token balance of a wallet or the transaction history of a DEX.

Oracles primarily focus on bridging the gap for off-chain data. However, an on-chain source can still be manipulated if it is a low-liquidity DEX pool, which is then incorrectly used as the single price feed.

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