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SQD (Subsquid)

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About SQD

SQD (previously Subsquid) unlocks next-gen functionality for dApps, AI agents, analytics and ZK Proofs/TEE through blazing-fast indexing.

SQD is a decentralized hyper-scalable data platform optimized for providing efficient, permissionless access to large volumes of data. It currently serves historical on-chain data, including event logs, transaction receipts, traces, and per-transaction state diffs. SQD offers a powerful toolkit for creating custom data extraction and processing pipelines, achieving an indexing speed of up to 150k blocks per second.

To get started, visit the documentation or see EVM examples of what you can build with SQD.

Supported Networks

  • Polygon Mainnet
  • Polygon Amoy Testnet
  • Polygon zkEVM
  • Polygon zkEVM Cardona Testnet

Why SQD?

  • Faster Development: SQD simplifies blockchain data access with its Squid SDK, allowing developers to write custom queries without getting bogged down in low-level blockchain protocols. This translates to quicker development times.
  • Cost-Effective: SQD offers free retrieval of historical blockchain data, eliminating a significant cost barrier for developers building data-driven applications.
  • Scalability: The decentralized architecture of SQD allows for infinite horizontal scaling, meaning it can handle massive amounts of data without compromising performance.
  • Flexibility: SQD supports a wide range of blockchains (including Layer 1 and Layer 2) and provides a developer-friendly interface for building custom indexers tailored to specific needs.

What can you build with SQD?

Here is an incomplete list of ideas of what one can build with SQD:

  • DeFi dashboards, tracking addresses and internal transactions
  • NFT marketplaces, with a dynamic sets of NFT contracts to watch
  • Historical price feeds, tracking Uniswap trades and Chainlink oracle contracts
  • Mining smart contract deployments and the bytecode
  • Real-time bots (<1sec delay) triggered by on-chain activity

SQD also enables cutting-edge use cases like AI agents, RAGs, ZK proofs, and TEE coprocessors.

How to host SQD APIs

There are generally two ways how you can host your SQD APIs:

  • Self-Hosting: You can manage your own infrastructure and deploy your SQD project (squid) yourself.
  • SQD Cloud: This is a hosted service by SQD that takes care of the infrastructure management for you.

Getting help

Get started faster! Join our Discord community and ask for help. Our engineers are ready to assist you.