A chart overlay is useful, but it is still a model
A memecoin paper trading extension watches the token page, reads a price, and records a virtual buy or sell. That makes order practice fast because you stay on Axiom, GMGN, or Padre. It does not place a blockchain transaction and should never need a seed phrase for a paper trade.
The hard part is the fill. A real swap can face thin liquidity, price impact, priority fees, MEV, failed transactions, and a moving quote between approval and confirmation. A simulated button can estimate some of those costs, but it cannot reproduce every wallet, RPC, pool, and block condition.