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Within Ethereum blockchain ecosystem TheGraph https://thegraph.com/ became almost standard solution to build GraphQL access to blockchain data (indexed in PostgreSQL)

SubQuery https://www.subquery.network/ does the same but for Polkadot chain.

What are main differences between them? What can be reused when redeploying smart contracts to Polkadot chain?

Paul Verest
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    There are no "Polkatdot smart contracts" so there is that. Polkatdot is just a security layer for different blockchains. Also looks like Subquery the project exist only as a name - they don't have anything build yet. – Mikko Ohtamaa Jun 25 '21 at 15:46

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