Pump.fun is testing a new in-house AMM that could potentially replace Raydium as Solana's top memecoin exchange.Raydium's RAY token dropped 20% amid Pump.fun's AMM rumors, with analysts predicting a 30%-50% trading volume decline if launched.Pump.fun's in-house AMM could retain liquidity within its own ecosystem, affecting Raydium's market share.Pump.fun's AMM development solidifies their position as a leader in memecoin innovation and revenue generation.