AI auto trading program, the dates official documents set when building one, from the first code to the key expiring a year later

2026-11-03

The day an AI writes the first code, how many days are still left before a real order goes out?

Search for how to build an AI auto trading program and courses on getting code by asking in plain words come up first. The code really does arrive in a day.

The dates after that are not set by the code. Exchange and broker documents set them, and so does the length of the backtest data.

This post assumes a start on November 3, 2026 and lists the dates met over one year, in order. The sources are Upbit's developer center, Korea Investment & Securities' official samples, and a paper on backtest overfitting.

1.Day one, morning: the AI writes the code

Describe the conditions in words and an AI writes the buy and sell functions. It takes a few hours.

The official samples Korea Investment & Securities posted on GitHub carry a clear sentence. The company is not responsible for losses caused by customer programs built from the samples (Korea Investment open-trading-api).

Whether an AI wrote the code or a sample was edited, responsibility for what it does stays with the person who runs it.

2.Day one, afternoon: the conditions for a key

Upbit issues API keys only on the PC website. The issue button opens only after sign-up, customer verification and two-channel authentication are complete (Upbit API key guide).

A key needs an IP address. Only public IPv4 addresses work, and private addresses behind a home router cannot be registered. An issued key works only from the registered IP.

Korea Investment's samples say to prepare a paper trading app key and a live trading app key separately. They also state that paper trading accounts have lower REST call limits than live ones.

App key: the key a broker issues for each program. Paper trading and live trading each get their own.

3.The first five days: the day the variant count passes the backtest length

This is the central date of the post.

What grows fastest when an AI does the work is the number of strategy variants, more than lines of code. Candidates that only change a moving average period or a stop width pile up quickly.

Backtest: running a strategy on past prices to see how it would have done back then.

A 2014 paper by Bailey, Borwein, López de Prado and Zhu worked out how data length and number of trials relate (Pseudo-Mathematics and Financial Charlatanism).

• 5 years of data: no more than 45 independent configurations should be tried
• 2 years of data: after only 7 tries, the expected best in-sample Sharpe ratio is 1 and the out-of-sample one is 0

A Sharpe ratio of 1 looks quite good on a report.

It means a winner that good shows up even among 7 strategies with no skill at all.

Now turn that into dates. Variants: 10 a day (assumed).

• 2 years of data: the line of 7 is passed on day one
• 5 years of data: the line of 45 is passed on day five, at 50 in total

The faster the AI gets, the sooner the trials a backtest dataset can carry run out, within days. Getting code faster does not make the data any longer.

The paper also points out that financial analysts rarely report how many configurations they tried before choosing one backtest. Without that count, it says, the degree of overfitting cannot be judged.

!Log the try number for every variant an AI makes. Without it, the winner's results cannot be read.

Adding fees raises the bar further. Fees by trade count and the break-even win rate are worked out in the auto trading program fee calculation.

4.Every morning from day two: a one-day token

The comments in Korea Investment's sample code give the access token a validity of one day. Asking again within 6 hours returns the same token, and each issue sends a KakaoTalk notice.

A new token can be issued once a minute.

To keep a program running for more than a day, the code needs a line that fetches the token again. Upbit's order requests went up to a maximum of 12 per second from 21:00 on August 21, 2026 (Upbit order rate limit notice).

5.The same day a year later: the key expires

The same Upbit notice says an API key is valid for one year and cannot be extended. Around November 3, 2027 (assumed), an expiry error appears. The expired key has to be deleted and a new one issued.

Write the date one year after the key was issued on the calendar first. The main pocket allows at most 10 keys, so expired keys left in place can block a new one.

6.One-line conclusion

Even when an AI writes the first code in a day, the key conditions, the one-day token and the one-year key set the dates up to a real order, and the first thing to run out along the way is the number of trials the backtest data can carry.

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