Solana's original SPL token standard was minimal — Token-2022 ('Token Extensions') adds capabilities directly to the token program rather than requiring custom contracts.
Notable extensions: transfer fees (a token can charge a percentage on every transfer — check this before trading, it affects round-trip cost), on-chain metadata (name/symbol/URI stored in the token itself, reducing reliance on off-chain registries), confidential transfers (balances and amounts encrypted — aimed at institutional use), and permanent delegate (issuer retains transfer authority — a red flag for traders: it means the issuer can move your tokens).
For traders, the practical checklist on any newer Solana token: does it use Token-2022, and which extensions are enabled? Transfer-fee tokens cost more to trade; permanent-delegate tokens carry issuer-control risk.
Dexana's swap tooling handles Token-2022 tokens — but knowing what extensions a token carries is part of basic due diligence.
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