Alienbase: Your First Swap on Base

A wallet connection uses the selected network. Switching the network selector to Base does not move an Ethereum balance onto Base. Funds can arrive through an exchange withdrawal explicitly supporting Base or a bridge supporting the asset and destination network. Bridging ETH does not move other tokens you hold on the source chain.

Coinbase exchange and Coinbase Wallet are separate products. A Coinbase exchange account can fund a wallet through a Base withdrawal; a compatible wallet then connects to Alien Base. The wallet's built-in swap and a swap through Alien Base are separate trading interfaces, so their quotes and charges can differ.

Connecting a wallet lets Alien Base read its public address and balances and request signatures. A token allowance separately authorizes a particular contract to spend a specified token. An ERC-20 swap may require an approval before the trade, depending on the existing allowance. A confirmed approval establishes spending permission; it does not establish receipt of the token you want to buy.

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Token search accepts a contract address, which helps distinguish assets sharing a name or ticker. ALB has moved to a new contract. The documented replacement ALB address is 0x1b23704e3f4bc7081fb00cec582183e3fe43cef7 .

Existing legacy ALB and esALB have a separate 1:1 token migration with no deadline. Buying the replacement ALB through a market swap and migrating tokens you already hold are different operations.

The Swap tab asks for the token you are selling, the token you want to receive, and the input amount. Epsilon compares supported DEX and aggregator routes on Base, including routes split across pools. Its net-of-fees routing accounts for gas, pool fees, and platform fees. The available liquidity and trade size affect the result; the routing mechanism does not promise a fixed exchange rate.

The Alien Base Fees reference, updated July 6, 2026, lists an asset-class platform fee plus a flat 0.05% protocol execution fee for Epsilon trades, in addition to underlying pool fees. Wallet-paid gas is another cost. Some traded tokens also charge their own transfer taxes, separate from the exchange's fees.

The Swap review shows the route, price impact, trading fee, and minimum received before wallet confirmation. Price impact concerns the trade's effect on pool pricing. Slippage tolerance limits the acceptable price movement between the quote and execution. A price move beyond that tolerance can revert the swap and still consume gas. An unacceptable minimum received is a reason to stop before signing.