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Web3 integration · hard

44. Working with Chainlink oracles in Vyper

Pulling reliable external price data on chain.

1 min read3 questionsup to 50 XPtopic 44/50

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Since contracts can't access the internet directly, price feeds and other external data come through oracles like Chainlink. You declare a small interface for the feed and call its `latestRoundData` (or similar) function.

interface AggregatorV3:
    def latestAnswer() -> int256: view

price_feed: public(address)

@external
@view
def get_price() -> int256:
    return AggregatorV3(self.price_feed).latestAnswer()

Always sanity-check oracle data (non-zero, not obviously stale) before using it for anything that moves funds, and consider what happens if the feed reverts or returns unexpected values.

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Check your understanding

  1. 1. Why can't a contract fetch a price from the internet directly?

  2. 2. How do you read from an oracle contract in Vyper?

  3. 3. What should you check before trusting oracle data?

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