How to Automate Polymarket Trades: API vs Banana Gun Terminal vs Copy Trading

There are three ways to stop trading prediction markets by hand, and they suit completely different people. Picking the wrong one wastes months.

Here is what each route requires from you, what it gives back, and who should ignore it. One of the three runs on Banana Gun, the same team behind the Banana Pro terminal we reviewed for token trading.

Route one: the API

You write code that reads market data and places orders. Full control, no interface between your logic and the market.

The requirement is that you have logic worth automating. An API turns a strategy into software, and if the strategy is undefined, all you have built is a faster way to express uncertainty.

There is also maintenance. Markets change, endpoints change, and a script that worked in March needs attention in August. That is ongoing work, not a one-time build.

This route makes sense if you are a developer with a tested edge in a specific category. For everyone else it is a project that competes for the time you were trying to save.

Route two: the Banana Gun terminal

A terminal does not trade for you. It removes steps between your decision and the fill, which is where most of the time actually goes.

Banana Predict organises markets across twelve categories with tabs for Trending, Breaking, New, Recurring and Bonding, so discovery starts from what is moving.

The order entry shows a real book with price, shares and total USD depth, plus a payout preview that calculates the return on a stake before you commit.

Positions sit in Portfolio, working orders in My orders, and fills in the Activity feed. A Wallet Tracker follows addresses, and a Social and X Tracker monitors accounts in real time with search by contract, symbol or user.

None of that is automation in the strict sense. It is compression, and for most traders it recovers more time than a script would.

Route three: copy trading

Copytrade mirrors a trader selected from the leaderboard, which ranks by profit and loss alongside volume.

This automates the hardest part, which is having a view. You are outsourcing judgement rather than execution.

The catch is that you inherit a person rather than a system. When their edge fades, nothing alerts you, and the leaderboard will show the old number for a long time afterwards.

Which one fits you

If you can define your rules precisely enough to write them down as conditions, the API is worth the build.

If your process is sound but slow, a terminal fixes the actual problem. Speed differences between terminals are real, and our Photon vs Axiom vs Banana Pro comparison shows how wide that gap gets on the token side.

If you have no view and want exposure, copy trading is honest about what it is, provided you attach your own sizing.

Most people who ask about automation are in the second group and reach for the first.

Cost is not the same across routes

An API costs you build time and maintenance. A terminal costs you nothing beyond learning it. Copy trading costs you the spread between the original fill and yours.

That last one is invisible and it is real. Your mirrored order arrives after the trader moved the market, which means you systematically pay slightly worse prices than the record you were copying.

Over a few hundred positions that gap becomes the difference between matching a leaderboard trader and underperforming them while taking the same risk. It is the same arithmetic we ran when asking whether crypto trading bots are profitable once fees and slippage are counted.

The mistake all three share

Automation applied to a thin market amplifies the depth problem.

On a contract at 62 cents, walking two or three cents against yourself removes a large share of the expected return. Manual traders notice this because they are looking at the book. Automated entries do not, because not looking was the point.

Whichever route you take, cap size against visible depth rather than against how confident you feel.

The shortest useful rule

Automate what you can describe. Keep manual what you can only judge.

What none of them automate

Resolution criteria stay yours. Markets resolve on written rules through a UMA-style process, and similar-looking contracts can resolve on different sources or dates.

Read the Rules section on anything you hold in size, every time, regardless of how the position was opened.

A reasonable sequence

Start with a terminal and run manually for a month while tracking where the time goes.

Add copy trading in one category with a fixed unit if you want exposure beyond your own reading. Consider the API only once you have a written rule set that survived a month of live conditions.

Building software before you have a rule that works is the most common and most expensive order to do this in.

The traders who end up with genuinely automated systems almost always arrive there slowly, after a manual process proved itself first. The ones who start with the code usually end up maintaining software instead of trading.

Mirroring comes with controls that decide whether it works at all, and the full guide to copy trading on Banana Predict covers each of them.

Open the terminal and see how much of your process is compression rather than code.