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| 1 | +!!! note "Content disclaimer" |
| 2 | + |
| 3 | + Please view the third-party content disclaimer [here](https://github.com/0xPolygon/polygon-docs/blob/main/CONTENT_DISCLAIMER.md). |
| 4 | + |
| 5 | +## About SQD |
| 6 | + |
| 7 | +[SQD](https://sqd.dev/) (previously Subsquid) unlocks next-gen functionality for dApps, AI agents, analytics and ZK Proofs/TEE through blazing-fast indexing. |
| 8 | + |
| 9 | +[SQD](https://sqd.dev/) 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. |
| 10 | + |
| 11 | +To get started, visit the [documentation](https://docs.sqd.dev/) or see [EVM examples](https://github.com/subsquid-labs/squid-evm-examples) of what you can build with SQD. |
| 12 | + |
| 13 | +#### Supported Networks |
| 14 | + |
| 15 | +- Polygon Mainnet |
| 16 | +- Polygon Amoy Testnet |
| 17 | +- Polygon zkEVM |
| 18 | +- Polygon zkEVM Cardona Testnet |
| 19 | + |
| 20 | +## Why SQD? |
| 21 | + |
| 22 | +- **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. |
| 23 | +- **Cost-Effective**: SQD offers free retrieval of historical blockchain data, eliminating a significant cost barrier for developers building data-driven applications. |
| 24 | +- **Scalability**: The decentralized architecture of SQD allows for infinite horizontal scaling, meaning it can handle massive amounts of data without compromising performance. |
| 25 | +- **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. |
| 26 | + |
| 27 | +## What can you build with SQD? |
| 28 | + |
| 29 | +Here is an incomplete list of ideas of what one can build with SQD: |
| 30 | + |
| 31 | +- DeFi dashboards, tracking addresses and internal transactions |
| 32 | +- NFT marketplaces, with a dynamic sets of NFT contracts to watch |
| 33 | +- Historical price feeds, tracking Uniswap trades and Chainlink oracle contracts |
| 34 | +- Mining smart contract deployments and the bytecode |
| 35 | +- Real-time bots (<1sec delay) triggered by on-chain activity |
| 36 | + |
| 37 | +SQD also enables cutting-edge use cases like AI agents, RAGs, ZK proofs, and TEE coprocessors. |
| 38 | + |
| 39 | +## How to host SQD APIs |
| 40 | + |
| 41 | +There are generally two ways how you can host your SQD APIs: |
| 42 | + |
| 43 | +- **Self-Hosting**: You can manage your own infrastructure and deploy your SQD project (squid) yourself. |
| 44 | +- **SQD Cloud**: This is a hosted service by SQD that takes care of the infrastructure management for you. |
| 45 | + |
| 46 | +## Getting help |
| 47 | + |
| 48 | +Get started faster! Join our [Discord community](https://discord.com/invite/subsquid) and ask for help. Our engineers are ready to assist you. |
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