> For the complete documentation index, see [llms.txt](https://docs.goodcrypto.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.goodcrypto.app/wallets/built-in-wallet/smart-contract-wallets.md).

# Smart Contract Wallets

Smart Contract Wallets (SCWs) are the next generation of wallets on Ethereum and other EVM chains. Traditional wallets (Externally Owned Accounts, or EOAs) are just a private key + address pair. By contrast, SCWs are programmable contracts that can hold funds, define custom rules, and execute logic around transactions. For goodcryptoX, this technology is what finally made non-custodial DEX trading possible.

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### Quick recap: EOAs vs Smart Contract Wallets

* EOA (Externally Owned Account): a standard Ethereum wallet (MetaMask, etc.). Controlled directly by a private key. Only EOAs can sign transactions.
* SCW (Smart Contract Wallet): a contract deployed on-chain. Unlike an EOA, it’s programmable — meaning it can verify and execute actions authorized by an EOA or [session keys](/wallets/built-in-wallet/smart-contract-wallets/session-keys.md). This programmability is what enables advanced features such as [transaction batching](/wallets/built-in-wallet/smart-contract-wallets/transaction-batching.md), gas payments in [tokens other than ETH](/wallets/built-in-wallet/smart-contract-wallets/gas-in-any-token.md), and flexible authorization schemes.

In goodcryptoX, when you set up an EVM wallet, you get both:

* an EOA (signer)
* a paired Smart Contract Wallet (funds live here)

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### Why they matter

Smart Contract Wallets became practical after adoption of ERC-4337 account abstraction in early 2023. This standard introduced:

* EntryPoint contracts: the gateway for SCW transactions
* Bundlers: nodes that collect SCW transactions and submit them on-chain

Together, they unlocked the ability to build a fully non-custodial trading experience — something we were waiting for before rolling out DEX functionality.

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### What they enable in goodcryptoX

Here’s what SCWs unlock for you inside goodcryptoX:

* Non-custodial trading

  The core benefit: you keep control of your funds. [Session keys](/wallets/built-in-wallet/smart-contract-wallets/session-keys.md) allow you to authorize trading without exposing your private key.
* [Session keys](/wallets/built-in-wallet/smart-contract-wallets/session-keys.md)

  Limited-permission, on-chain verifiable keys that make non-custodial trading smooth and safe.
* [Transaction batching](/wallets/built-in-wallet/smart-contract-wallets/transaction-batching.md)

  Multiple actions packed into one transaction. Example: approvals + swap combined into a single click. Saves time and gas, since multiple steps are executed in a single transaction.
* Paymasters and [gas abstraction](/wallets/built-in-wallet/smart-contract-wallets/gas-in-any-token.md)

  Lets you pay gas in tokens other than ETH — a critical step for usability.
* [MEV protection](/dex-trading-spot/orders-mechanics/mev-protection.md)

  SCW transactions are submitted via a private pool, giving them native resistance against front-running and sandwich attacks.
* Future flexibility

  From [grouped withdrawals](/dex-trading-spot/upcoming-functionality/batch-transfers.md) to more advanced [trade batching](/dex-trading-spot/upcoming-functionality/batch-orders.md), SCWs open the door to features we couldn’t deliver with EOAs alone.

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### Trade-offs

SCWs do have some drawbacks:

* SCWs consume slightly more gas per transaction — noticeable on Ethereum mainnet, but almost negligible on L2s.
* New infrastructure: EntryPoints and bundlers are still maturing, which adds complexity.

But the benefits far outweigh the costs, especially as the ecosystem standardizes.

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### Where things are going

The direction of travel is clear:

* EVM chains
  * Step 1: ERC-4337 introduced separate SCWs.
  * Step 2: EIP-7702 allows EOAs to double as SCWs.
  * [Endgame](https://vitalik.eth.limo/general/2021/12/06/endgame.html?utm_source=chatgpt.com): *every wallet becomes a Smart Contract Wallet by default*.
* Solana

  On Solana, wallets already rely on program logic under the hood. However, session key infrastructure and gas abstraction are not yet developed enough to enable the same non-custodial trading flow we support on EVMs. We expect Solana’s wallet infrastructure to evolve along similar lines in the near future.