This repo contains sample squid ETLs for indexing, transforming and presenting EVM on-chain data as GraphQL APIs. Each squid highlights a specific feature of the Subquid SDK.
- 1-evm-logs: Index ERC20 transfers by extracting
Transfer(address,address,uint256)event logs emitted by a given contract. - 2-transaction: Index transactions data.
- 3-factory: Index token swaps within dynamically created pools. Illustrates network-wide filtering of EVM logs.
- 4-contract-calls: Enrich the model data by querying historical state of the contract.
- 5-multicall: Same as the contract example but with state requests batching.
- 6-ipfs A BAYC NFT indexer. Illustrates batched IPFS gateway calls, external API calls, and contract state queries. Alternative implementation of the BAYC indexer described in the tutorial.
- 7-multichain A simple multichain squid indexing Transfer events emitted by USDC contracts on Ethereum and BSC.
- Node v16.x
- Docker
- Squid CLI
To install the Squid CLI, run
npm i -g @subsquid/cli
Navigate to the example folder.
npm ci
sqd build
# start the database
sqd up
# starts a long-running ETL and blocks the terminal
sqd process
# starts the GraphQL API server at localhost:4350/graphql
sqd serve