Long Butterfly with Calls Option Strategy

Three strikes, four contracts: buy one call at the lower strike, sell two at the middle strike and buy one at the upper strike, all in the same expiration. The debit paid is the maximum loss, and the peak payoff arrives with the underlying sitting exactly at the middle strike at expiration, which makes this a defined risk way to bet on a narrow range.

Each leg prices from an option symbol assembled from your inputs, with on demand bid, ask and previous close and the stock's last price, so the debit and both breakevens follow the chain.