def METHOD_NAME(product_id: str) -> str:
    """Helper method that checks if provided product_id exists. It's a pair of coins in format COIN-COIN.
    If product exists it return it, in other case it raise an error. [Source: Coinbase]
    Parameters
    ----------
    product_id: str
        Trading pair of coins on Coinbase e.g ETH-USDT or UNI-ETH
    Returns
    -------
    str
        pair of coins in format COIN-COIN
    """
    products = [pair["id"] for pair in make_coinbase_request("/products")]
    if product_id.upper() not in products:
        raise argparse.ArgumentTypeError(
            f"You provided wrong pair of coins {product_id}. "
            f"It should be provided as a pair in format COIN-COIN e.g UNI-USD"
        )
    return product_id.upper()