What is Uniswap (plain English)

Uniswap is a decentralized protocol for swapping tokens on-chain. You trade from your own wallet, signing transactions yourself.

updated 2026-03-01reading: 8–10 min

Uniswap is a protocol, not “a website”

The Uniswap web app is one interface. The core is smart contracts on a blockchain. That’s why your wallet is the “account,” and why network fees (gas) exist.

Order book vs AMM

Traditional exchanges use an order book. Uniswap uses an AMM: a pool holds reserves and prices update as trades change the reserves.

What you should understand before your first swap

  • Gas and network fees: you need the native token of the network.
  • Slippage: execution price can move between quote and inclusion in a block.
  • Token risk: fake tokens, transfer taxes, blocklists, and malicious approvals.
  • LP risk: impermanent loss and (in v3) range management.
Next: read How to swap safely before you click “Confirm”.

What Uniswap does and does not do

Uniswap does not hold your funds, reset your password, or reverse a transaction. Your wallet signs transactions and your assets move on-chain. This is powerful, but it also means mistakes can be costly.

What you control

  • Your wallet, network selection, and transaction signing.
  • Slippage tolerance and “minimum received.”
  • Which token contracts you approve and how much you approve.

What you should double-check every time

  • The domain and interface you’re using (bookmark it).
  • The token contract address for unfamiliar assets.
  • The gas fee and whether the swap size justifies it.

When a centralized exchange can be simpler

For very small trades, on-chain gas can dominate. For newcomers, a centralized exchange can be easier for the first purchase of ETH, after which you can move to self-custody and use Uniswap when it fits your needs.

Next: AMM basics.

Self‑custody basics (read once, reuse forever)

Using Uniswap means you are the account owner. That’s the upside and the responsibility. Keep your recovery phrase offline. Consider a hardware wallet if you plan to keep meaningful balances. When a wallet asks you to sign something you don’t understand, stop and verify — signatures can approve token spending or interact with contracts in unexpected ways.

What to look for on a transaction screen

  • Network: is it the chain you intended?
  • Spender: which contract is being approved (if any)?
  • Amount: is the approval unlimited or limited?
  • Gas: does the fee make sense relative to your trade size?