# MetaMask notes

## Developers

If you have MetaMask installed, you can use MetaMask (or Venus for CMT) as the web3 provider for BUIDL. Just select MetaMask (or Venus) from the **Providers** tab. BUIDL will use MetaMask account to pay gas for deploying or calling contracts. The web3 instance in the dapp will also now come from MetaMask.

![](/files/-Lq2n-PTZMucysZ3cS13)

However, when you publish the dapp, you will be asked to fill in a "backup" web3 provider since we cannot assume all users also have MetaMask installed.

## Users

If a user has MetaMask (or Venus for CMT) installed, she can switch to MetaMask or Venus at the account switcher on the published dapp. The dapp will use the web3 object from the MetaMask or Venus account.

![](/files/-Lq2n8Mb2kp0bWrVgYqK)


---

# 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.secondstate.io/buidl-developer-tool/getting-started/metamask-notes.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.