# Custom Transaction Builder

Some teams like to directly interact with smart contracts and Den's transaction builder makes it easy with a Custom Transaction Builder, no matter how complicated your inputs are. This is accessible when you select the `Build it myself` option.

Paste in the address of the contract you'd like to interact with. Den will automatically retrieve the contract's ABI, and will even fetch ABIs for the proxy contract's implementations.

<figure><img src="https://731861436-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FPw0mN04sXbA90tnBcjau%2Fuploads%2FS20ponnCrDesWsyYozxg%2FScreen%20Shot%202023-01-08%20at%206.59.14%20PM.png?alt=media&#x26;token=bdbc5526-3711-4a9c-8385-c9a627951e41" alt=""><figcaption></figcaption></figure>