This squid captures USDC Transfer events on ETH and BSC, stores them in the same database and serves the data over a common GraphQL API.
The Ethereum processor is located in src/eth and similarly the Binance Chain processor can be found in src/bsc. The scripts file commands.json was updated with the commands process:eth and process:bsc to run the processors.
You can find some useful hints on developing multichain squids on the dedicated documentation page.
Dependencies: Node.js, Docker, Git.
# 0. Install @subsquid/cli a.k.a. the sqd command globally
npm i -g @subsquid/cli
# 1. Clone the repo
git clone https://github.com/subsquid-labs/multichain-transfers-example
cd multichain-transfers-example
# 2. Install dependencies
npm ci
# 3. Start a Postgres database container and detach
sqd up
# 4. Apply the migration
sqd migration:apply
# 5. Build the squid
sqd build
# 6. Run all services at once
sqd run .A GraphiQL playground will be available at localhost:4350/graphql.
You can also run individual services separately:
sqd process:eth # Ethereum processor
sqd process:bsc # BSC processor
sqd serve # GraphQL server