# Connect to MultiVAC via Web3

The MultiVAC mainnet supports EVM (Ethereum virtual machine), so you can use Ethereum's web3 tools to connect to MultiVAC.

Web3 API docs:

{% embed url="<https://web3js.readthedocs.io>" %}

Connect to MultiVAC Mainnet:

```javascript
const web3 = new Web3('https://rpc.mtv.ac');
```

Or you can use websocket:

```javascript
const web3 = new Web3('https://websocket.mtv.ac');
```

Get the number of the recent block:

```javascript
web3.eth.getBlockNumber()
.then(console.log);
> 4475231
```

Get account balance:

```javascript
web3.eth.getBalance("0xB64BA36f4F8BC2AC451940e36f978A368C6B2d5A")
.then(console.log);
> "99844290333000000000"
```

Get a transaction:

```javascript
web3.eth.getTransaction('0xdd7076df246df862f37538974acf4fd3a3bd535af7e9ec6991939da9ffc43908')
.then(console.log);

> {
  blockHash: "0x0814fbeeacee4b2ce0653e16a169acec9eacc08c94644d901c72ac5e50708642",
  blockNumber: 4465645,
  from: "0x00000df3e3e1f1b1212b8bdb8896df4442f13a4c",
  gas: 100000,
  gasPrice: 1000000000,
  hash: "0xdd7076df246df862f37538974acf4fd3a3bd535af7e9ec6991939da9ffc43908",
  input: "0x",
  nonce: 6950514,
  r: "0xf52dff98e28dc687b7cea0035bb6b69213453c63d293204cf854065890f7befb",
  s: "0x4a2e672ccdd9667f1bab500f8da4cf4b68c310832c22c5af272162a1a97e5f10",
  to: "0x147de9adb01dbbf567c5c97d6478a37b1a3236ca",
  transactionIndex: 5,
  type: "0x0",
  v: "0x1e95d",
  value: 2169045532468861238
}
```

Send a transaction:

```javascript
// compiled solidity source code using https://remix.ethereum.org
var code = "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// This is the code to deploy MRC20 token

// using the callback
web3.eth.sendTransaction({
    from: '0xB64BA36f4F8BC2AC451940e36f978A368C6B2d5A',
    data: code // deploying a contract
}, function(error, hash){
    ...
});

// using the promise
web3.eth.sendTransaction({
    from: '0xB64BA36f4F8BC2AC451940e36f978A368C6B2d5A',
    to: '0xB594c29B37c458DEC0Eb5a2ebe47b89b40bc16Fc',
    value: '1000000000000000'
})
.then(function(receipt){
    ...
});


// using the event emitter
web3.eth.sendTransaction({
    from: '0xB64BA36f4F8BC2AC451940e36f978A368C6B2d5A',
    to: '0xB594c29B37c458DEC0Eb5a2ebe47b89b40bc16Fc',
    value: '1000000000000000'
})
.on('transactionHash', function(hash){
    ...
})
.on('receipt', function(receipt){
    ...
})
.on('confirmation', function(confirmationNumber, receipt){ ... })
.on('error', console.error); // If a out of gas error, the second parameter is the receipt.
```

MultiVAC supports most of the Web3 interfaces. If you just deploy contracts, process transaction information, and send transactions, MultiVAC's web3 interface and return value are no different from Ethereum's. However, in the return value of Block information, the definition of some fields may be significantly different from Ethereum. Please see [this article](/api-differences-between-multivac-and-ethereum.md) for specific differences.


---

# 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.mtv.ac/connect-to-multivac-via-web3.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.