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I would like to get an oracle for values of countries' based currencies. Are there such free oracles?

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    You can make one using chainlink external adapters. All you need is a source, from which you want to bring the data. – Anupam Kumar Apr 11 at 13:55
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Chainlink's decentralized oracle network can easily facilitate this. You can either find your own data source or sources and make an Any-API request in your contract or depending on what data you want they already have a growing list of currency exchange rates in their list of data feeds. These are feeds that pull data from multiple high-quality sources, then have multiple oracles aggregate the data and post the final result on-chain, where it can be consumed by other smart contracts. More info in their Price Feeds docs

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