Copy trading watches specific wallet addresses on-chain and reacts when they trade. When a tracked wallet buys a token, you get an alert, and optionally the bot places a matching buy for you using your own configuration.
The hard part is usually not the copying — it is deciding whose wallet to copy. ARCHR scores memecoin wallets on realized performance over a rolling 7-day window and publishes a ranked list, with eligibility gates so a wallet needs a real trading history rather than one lucky round-trip to appear. You pick from that list in a click instead of trawling explorers for addresses. Rankings describe what already happened; they are not a forecast.
It is a fundamentally different signal from a call channel. A call is someone telling you what they think; a wallet is someone showing you what they did with their money. That is usually a stronger signal — but only if you understand why they did it.
The failure mode is blind mirroring. Copying a wallet without a minimum-buy threshold means you also copy their throwaway test entries. Copying without your own exit plan means you hold whatever they hold, including the bags they are quietly comfortable losing because it is 0.1% of their book and 30% of yours. Their position sizing encodes their risk tolerance, their conviction, and their portfolio — none of which transfer.
So the controls that matter are the ones that separate their entry decision from your risk decision. ARCHR copies the fact that a wallet bought, and applies your size, your filters, and your exits to it. Whether you copy their sells is a separate switch, because 'when to get in' and 'when to get out' are different judgments and you may only trust them on one.