201 - Chainlink

Chainlink Oracles & Price Feeds: Chainlink Price Feeds provide aggregated data (via its AggregatorV3Interface contract interface) from various high quality data providers, fed on-chain by decentralized oracles on the Chainlink Network.

To get price data into smart contracts for an asset that isn’t covered by an existing price feed, such as the price of a particular stock, one can customize Chainlink oracles to call any external API.