# 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="/files/xq5V7L9Nh3oug3U7CCaD" alt=""><figcaption></figcaption></figure>


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.onchainden.com/creating-transactions/custom-transaction-builder.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.