Options paper trading: how to test a strategy honestly

What options paper trading is for

Paper trading runs a strategy with pretend money against real prices. Its job is to find out, cheaply, whether a rule earns more than it loses, before capital is at risk. It is not a way to feel confident; it is a way to be wrong for free.

Start with a backtest, then paper trade forward

For options you do not have to wait months to learn anything. Historical option quotes let you replay a rule over years in minutes, using the price a seller really receives (the bid) instead of the midpoint.

Paper trading forward is then a second, independent check: new trades the rule had no chance to be fitted to. A rule that looked good on history and fails going forward was fitted to the past.

Write the test down first

Decide the rule, the ticker list, how trades are closed and what result counts as success before you run it. Registering the rule up front prevents the common failure of trying many variations and keeping the best looking one.

Judge it on the return per dollar of capital tied up, using a lower bound rather than the average, and count the losing trades. A high win rate with rare large losses can look perfect for months.

Traps that make a paper record meaningless

Filling at the midpoint. Real sellers get the bid, which is lower.

Many trades that are really one bet. Ten puts on tech stocks opened the same week are closer to one trade than ten.

Ignoring assignment and early exits. Measure what the rule does when a put is threatened.

Changing the rule after a loss. If the rule changes, the record restarts.

Doing this on Vesper

Describe an idea, score it on years of history, register it to paper trading, and follow the result at expiry pace. The scoring is the same for everyone, including the house strategies, and nothing here places a real order.