Function main

examples/all_erc20_transfers.py:12–91

()

# For a more complex example with multiple events, see all-erc20-transfer-and-approve.py

async def main():
    bearer_token = os.getenv("ENVIO_API_TOKEN")
    if not bearer_token:
        raise ValueError("ENVIO_API_TOKEN environment variable is required. Please set it in your .env file.")
    
    client = hypersync.HypersyncClient(ClientConfig(
        url="https://eth.hypersync.xyz/",
        bearer_token=bearer_token
    ))

    # The query to run
    query = hypersync.Query(
        # start from block 0 and go to the end of the chain (we don't specify a toBlock).
        from_block=0,
        # The logs we want. We will also automatically get transactions and blocks relating to these logs (the query implicitly joins them).
        logs=[
            hypersync.LogSelection(
                # We want All ERC20 transfers so no address filter and only a filter for the first topic
                topics=[
                    [
                        "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"
                    ]
                ]
            )
        ],
        # Select the fields we are interested in, notice topics are selected as topic0,1,2,3
        field_selection=hypersync.FieldSelection(
            block=[BlockField.NUMBER, BlockField.TIMESTAMP, BlockField.HASH],
            log=[
                LogField.LOG_INDEX,
                LogField.TRANSACTION_INDEX,
                LogField.TRANSACTION_HASH,
                LogField.DATA,
                LogField.ADDRESS,
                LogField.TOPIC0,
                LogField.TOPIC1,
                LogField.TOPIC2,
                LogField.TOPIC3,
            ],
            transaction=[
                TransactionField.BLOCK_NUMBER,
                TransactionField.TRANSACTION_INDEX,
                TransactionField.HASH,
                TransactionField.FROM,
                TransactionField.TO,
                TransactionField.VALUE,
                TransactionField.INPUT,
            ],
        ),
    )

    # start the stream
    receiver = await client.stream(query, hypersync.StreamConfig())

    decoder = hypersync.Decoder(
        ["Transfer(address indexed from, address indexed to, uint256 value)"]
    )