Optimism DEX

Optimism DEX is a category, not one official protocol: decentralized exchanges on OP Mainnet are automated market makers where trades settle against liquidity pools instead of an order book run by a company. This dashboard is informational only — it holds no funds, controls no keys, and operates no pools; the underlying exchanges (Velodrome, Uniswap, and others) provide the contracts and liquidity. There is no account, deposit step, or withdrawal queue: you connect a self-custody wallet, and each swap is a single wallet-signed transaction that either executes atomically or reverts.

A swap starts with an input token, an output token, and an amount; the interface queries supported pools and returns a route, either a single pool or a hop through an intermediate token like WETH. The quote gives three decision values: expected output, price impact (how much your own trade moves the pool price), and the slippage limit that sets your minimum received. For an ERC-20 input, the ERC-20 token standard uses a separate approval transaction to grant the identified router permission to spend the token. You then sign the swap; OP Mainnet's sequencer includes it and the pool contracts exchange the tokens atomically, while a price move beyond the slippage limit by inclusion time makes the transaction revert.

This dashboard covers OP Mainnet — an EVM-equivalent optimistic rollup with chain ID 10 that settles to Ethereum. ETH is the native gas asset; OP is a governance token and does not pay for gas. Most swappable assets are ERC-20 tokens, and ETH often appears inside pools as its wrapped form, WETH. A pair is available only when its token contracts are deployed on OP Mainnet, a pool holds liquidity, and a supported router exposes the route; a pair on Ethereum mainnet does not automatically exist here. For a current view of active protocols, use DefiLlama's OP Mainnet page.

A swap's costs are the pool fee, network gas, and price impact. The pool fee is a percentage built into each liquidity pool, taken inside the swap math, and paid to liquidity providers; different pools for the same pair can use different fee tiers, so routes can differ. Network gas is paid in ETH on OP Mainnet and is typically a fraction of Ethereum mainnet cost because execution happens on the rollup. Price impact is not a fee: it is the cost of consuming available liquidity, grows with trade size relative to pool depth, and can dominate on thin pairs. The quote's expected output and minimum received already reflect the pool fee and impact.

Optimism DEX is non-custodial: no operator can freeze or lose a balance deposited with this dashboard because no balance is deposited. That removes exchange-custody risk, not smart-contract bugs in the pool or router, malicious or spoofed tokens, phishing frontends, persistent approvals, slippage and sandwich exposure on thin pairs, or failures in the underlying rollup and Ethereum settlement layers. Open-source or audited contracts can reduce certain failure modes; they do not eliminate the risks above. L2Beat's OP Mainnet profile tracks the network's security model and upgrade assumptions. Before signing, verify the token contract address, check the spender and amount in an approval, and inspect every signature request.

To swap, connect a self-custody wallet to the application, set it to OP Mainnet (chain ID 10), choose the pair and amount, then sign the transactions created by the route.

1. Select the input token, output token, and amount; let the app fetch a quote from its supported pools and routes.
2. Read the token contracts, expected output, price impact, slippage limit, minimum received, route, fees, and transaction deadline. If the input is ERC-20, sign the separate approval for the identified router and its requested amount.
3. Sign the swap transaction. The sequencer includes it, the pool contracts execute the exchange atomically, and the output tokens land in the same connected wallet; a price move beyond the slippage limit makes it revert.

Most failed swaps on OP Mainnet resolve to a network, gas, quote, approval, liquidity, or token-availability state.

Wrong network. Switch the wallet from Ethereum mainnet to OP Mainnet when the token list is empty or no quote loads. No gas. ETH on OP Mainnet is required for every transaction, including approvals; bridged tokens alone will not pay for it. Approval succeeded but the swap failed. The approval is a separate transaction and remains in place, so the swap can be retried without another approval. High price impact. The pool is thin for the trade size; split the trade or choose another route. Reverted transaction. The price usually moved beyond the slippage limit before inclusion; fetch a new quote. Token absent. The pair may not be exposed by the supported routers; confirm the token contract is on OP Mainnet and import it manually.