SubQuery
A GraphQL indexer and query service that allows users to easily create indexed data sources and host them online for free.
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Subsquid subsquid.io
An indexing framework (SDK + infrastructure) to quickly and easily turn Substrate and EVM on-chain data into APIs and host them.
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Nova SubQuery API github.com
A SubQuery API implementation for operation history and staking analytics.
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Substrate Graph github.com
GraphQL indexer for Substrate-based chains.
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Archive github.com
Indexing engine for Substrate chains.
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GraphQL: A data query language graphql.org
Original announcement explaining GraphQL's purpose and design.
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Grafbase grafbase.com
Instant GraphQL APIs for any data source.
Substrate › Tools: “A GraphQL indexer and query service that allows users to easily create indexed data sources and host them online for free.”
Algorand › Infrastructure & Ecosystem Services > Nodes & Consensus Participation: “Open, fast, flexible, and decentralised cross-chain data indexer for Algorand (getting started guide).”