Workbench.BalanceSnapshots.MidPrice.first

You're seeing just the function first, go back to Workbench.BalanceSnapshots.MidPrice module for more information.
Link to this function

first(asset, quote_pairs)

Specs

first(asset(), [quote_pair()]) :: {:ok, Decimal.t()} | {:error, error_reasons()}
Link to this function

first(asset, list, errors)