Back to: DeFi 101
Every bank service — swapping currency, lending, borrowing, earning interest — exists because strangers need a trusted middleman. DeFi replaces each middleman with a smart contract: the rules are public code, execution is automatic, and access needs no permission.
The mapping
| Bank does | DeFi does it with | Example |
|---|---|---|
| Currency exchange | DEX | Uniswap |
| Savings interest | Lending pools | Aave |
| Loans + credit checks | Over-collateralized borrowing | MakerDAO |
| Fund management | Vaults | Yearn |
What's genuinely better
– Access: anyone with internet and a wallet — no application, no minimums, no business hours, no borders. – Transparency: every position, rate, and reserve is on-chain and auditable in real time. No quarterly reports; the ledger *is* the report. – Composability: protocols plug into each other, so new products assemble in days instead of years.
What's genuinely worse
– No safety net: no deposit insurance, no fraud reversal, no support line that can undo a mistake. – You are the compliance department: taxes, approvals, and risk checks are all on you. – Code risk replaces banker risk: a bug is a bank run with no pausing it (see: every nine-figure hack retrospective ever).
The mindset for this path
Treat every protocol as guilty until its code, audits, and economics check out — and size every position so that being wrong doesn’t end you. DeFi rewards the careful and taxes everyone else automatically.
Banks ask “who are you?” DeFi asks “what does the code say?” Both questions
> can cost you money — only one of them tells you the rules up front.
Next lesson: DEX trading masterclass.