How to copy a Polymarket wallet's trades

The short way

Start with the address, because nothing below chooses it for you and nothing here should. Read its record first — tracking a wallet's positions covers the products that do that without routing an order — and be clear what the record is: what one account did on one venue over one window.

Then rehearse. Polywhaler's Orca runs paper portfolios free with an account: add the address, set a fixed amount or a percentage of each of its trades, and every trade it makes is copied into simulated cash at real market prices. The useful part is that Orca prices each portfolio twice — once at the prices the leader got and once at the prices a copier could actually have filled at, rebuilt from the trades that printed on the market after the leader's fill. The vendor's own page calls the second figure a ceiling rather than an estimate, because some of those prints were maker fills and a copier crossing the spread pays slightly worse. Read the executable line, and read it as the best case.

Only then pick a product that places real orders, open a separate wallet in it, and fund that wallet with the copy budget and nothing else. Set the size per copy, a cap per market and in total, a slippage limit, and what happens to a copy too small for Polymarket's minimum. Before the first copy fires, add the product's fee to the venue's and work out what one copy at your size costs.

What the options are

The six are ordered by what the vendor's side holds that can move your money, from nothing to a key you brought from elsewhere. That is the question that differs most between them and the one a fee table hides. Where your key lives sets out the four kinds of credential; here is what each product asks for.

Polywhaler holds nothing on the Polymarket side, because it does not copy live. Its auto-copy page, read on 8 October 2026, says Orca cannot place real orders for you automatically yet: a live portfolio, on the 9 USD Pro plan, trades only when you place an order, and on Polymarket that order is signed in your own browser wallet. Automatic copying is a paper feature. On Kalshi, live orders are signed on Polywhaler's servers with an API key you create there, which is revocable. It sits first because it is the rehearsal, not the copier.

Polycool and Kreo sit level: a wallet created through Privy that you can export. Polycool is a phone app (iOS, Android, Telegram) whose terms say the company never has custody and cannot move funds without your authorisation. Copy trading takes any number of leaders, each with a percentage of a copy budget, sized proportionally to the leader's portfolio weight or as a fixed USDC amount, with a guard that skips the copy if the price has moved 1 to 10 cents above the leader's entry. Its fee runs from 1.00% down to 0.50% on lifetime volume, with a three-cent floor per execution and different rates for trades placed in the iOS app. Kreo is a Telegram bot and web app whose terms say it controls no private keys; the wallet is a Safe deployed through Polymarket's infrastructure. It sizes five ways (fixed, the leader's exact amount, a percentage, or a share of your portfolio or free balance with a 0.01 to 10 times multiplier), defaults to 5% slippage, and can copy sells, merges and splits. Neither documents what its servers are authorised to do with your wallet while a copy fires without you.

PolyBot creates the key that signs for your wallet. The wallet is a Safe on Polygon and is yours on-chain, but PolyBot generates its signer and can send it to you on request, so its systems hold it. Three copy subscriptions per wallet, a fixed amount from 1.10 USD or the leader's size times 0.01 to 10, sells mirrored as a percentage, and 1% of every fill, which its own FAQ says promotions and account overrides can change. It is not available to US persons in its own words.

PolyCop holds the key, and says so. Its terms describe copy trading as mirroring a selected wallet's trades "into the user's own custodial wallet", and say the company holds the private key material, encrypted, with access limited to authorised systems and personnel. Sizing is fixed or proportional, with caps per trade, per market, per side and in total, and a sub-wallet option that gives each leader its own wallet. The fee is a flat 0.5% of every fill. The key can be exported and imported into another wallet, which is the documented way out.

PolyTrack asks for the most and publishes the least. Its auto mode needs your Polymarket API key, secret and passphrase plus a private key, held encrypted on its server, and the site has no terms of service and no privacy policy. Copy trading is on Pro at 19 USD a month, and a copied trade adds a platform fee of 2% under 100 USD, falling to 0.5% from 5,000 USD — read from the app's code, because no fee page publishes it. The form itself advises a dedicated trading wallet, which is the right advice for every product on this page.

Where this breaks

The key the copier holds can move more than the copies. On Polymarket a wallet's private key signs transfers and token approvals as well as orders, and nothing about the key narrows it to trading. A product that holds it, or a signer for your Safe, holds whatever the wallet holds. Polymarket's session keys are the one documented credential in this sector that trades and cannot withdraw; none of the six products above says it uses one, so ask before assuming. The control that works regardless is the balance: a wallet that holds only the copy budget, swept regularly, is a ceiling on what any of these can lose for you. Two-factor authentication on PolyBot and Kreo guards withdrawals and key export, not who else can sign.

A copy fails for reasons the leader never meets. It fails when your wallet is short of collateral, and on Kairos a failed copy for lack of balance pauses every subscription you have, not only the one that failed. It fails when the size falls under Polymarket's minimum order — 1 USD for a market order, 5 shares for a limit — which catches small proportional copies; Kairos skips them, PolyCop lets you choose between skipping and rounding up. It fails when the book is too thin to fill inside your slippage limit, and it fails when the copy is too old: Kairos drops signals older than 30 seconds. On PolyCop, copy trading will not start under 50 USD in the wallet. A copier that skips quietly leaves you holding some of the leader's positions and not others, which is a different book from the one you set out to follow.

Two fees on every fill, and the second is the product's. Polymarket charges takers and never makers, at 1.25¢ a share at 50¢ for most categories and 1.75¢ for crypto. A copy is almost always a taker. Then the product adds its own: on Kreo at 50¢ on a crypto market the two together are about 3.5¢ a share, 7% of what the share cost, and Kreo's fee page does not mention Polymarket's. Floors decide small copies — Polycool's three cents is 1.5% of a two-dollar copy, and Kreo's 0.3¢ floor is 30% of a share bought at 1¢. A limit copy that rests can avoid Polymarket's taker fee, but Kreo, PolyBot and PolyTrack do not exempt limit orders from theirs. Kreo also pays the copied wallet 15% of the fees its followers generate, which rewards a leader for trading often, not for the copies. What a trade actually costs converts the venue's half and the taker fee entry defines the unit.

On a thin book the copy pays for the leader's fill. The leader's order consumed the best prices; yours arrives after it, as a taker, at whatever is left. That is slippage, and the defaults are wider than they look: Kreo's is 5%, PolyBot's can be set to unlimited, and PolyCop's unattended templates start market buys at 30%. A stop-loss on a copied position is a market order too; PolyCop's own example is a 20% stop turning into a 25–30% loss. The executable view in Orca is the only published attempt to price this per address, and its vendor calls the result an upper bound.

The address can change and the copy will follow it. A copy is bound to an address, not to a person or a style. The address can move into markets your filters exclude, change its size, start splitting and merging conditional tokens, hand control to a bot, or go quiet while its owner trades from a different one — one person can run several addresses, and nothing on-chain links them. Proportional sizing amplifies the first two: a leader who doubles size doubles yours. Review what a copy actually bought, not what you expected it to buy, and what wallet tracking shows covers what an address record can and cannot tell you.

A potential-insider flag is a classifier, not a finding. Polywhaler scores single trades 0 to 100 on timing against resolution, price impact and size at those odds, and says itself that a high score is not an accusation; PolyTrack sells "grouped insider wallets" with no method published. What the record supports is that an address took a position ahead of a move. Who it belongs to, what they knew and whether any rule applied to them are not in the data — insider-trading rules on event contracts sets out the rules that do exist and material non-public information defines the term. And the property that earns the flag, timing, is the one thing a copy cannot reproduce, because it arrives after the fill.

The venue's geoblock is the copier's geoblock. A product placing orders on Polymarket is never more available than Polymarket, whose international venue bars US persons and blocks the United Kingdom and most of western Europe as well. PolyBot excludes the United States in its own words; Polycool, PolyCop and Kreo defer to the venue's restrictions and forbid getting around them, and Polycool's terms name VPNs. A US reader cannot use any automatic copier on this page, and neither venue that will open them an account — Polymarket US and Kalshi — publishes a per-account ledger anyone could copy from. Why a venue is unavailable where you are is the longer version.

If you outgrow this

If the bot's settings stop being enough, the next step is a terminal with copy rules beside everything else. Polyrama mirrors a wallet you star with per-wallet caps, size scaling, a fade mode and a paper-only mode, charges nothing published, and never asks for a private key: it stores the order-book API credentials Polymarket issues, which can place orders and are not the wallet's key. Its live side is Polymarket only; Kalshi is read-only. Kairos mirrors Polymarket and Predict.fun trades with a percentage or fixed-dollar allocation, charges a platform fee on every taker fill and nothing to makers, and signs by default with a managed key its docs call the custodial lane.

If what you want is the key in your own process and the venue's fee as the only fee, you are writing the copier: watch the address, decide the size, and send the order yourself. Placing an order from code covers the clients, the credential and the wallet approvals. poly-maker is not a copier, but it shows what a bot you run yourself has to carry that the products above carry for you: per-market and total exposure caps, a daily-loss kill switch, a journal of every order, and Polymarket's exchange heartbeat, which cancels resting orders if the process dies. Read what a bot cannot fix before the first funded run; the copy-trading collection lists every card that copies onto your own account.