use alloy_chains::Chain;
use foundry_block_explorers::Client;

async fn foo() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new(Chain::mainnet(), "<your_api_key>")?;
    // Or using environment variables
    let client = Client::new_from_env(Chain::mainnet())?;

    let address = "0xBB9bc244D798123fDe783fCc1C72d3Bb8C189413".parse()?;
    let metadata = client.contract_source_code(address).await?;
    assert_eq!(metadata.items[0].contract_name, "DAO");
    Ok(())
}