Private keys are kept encrypted on your computer. Cross-chain transactions are carried out using atomic swaps.
You pay only miner commission for both regular and cross-chain transactions.
No registration or identity verification required. However, all addresses are checked against abuses and suspicious origin of funds.
Your counterparty is not an ordinary user, but a professional market maker whose task is to ensure sufficient liquidity.
Atomex provides websocket API for wallets and market makers. Contact us if you have questions regarding integration.