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# How to Interact With DSA using Web3
DeFi Smart Accounts (DSA) are contract accounts **trustlessly owned by the users** . Briefly, DSA is designed to allow developers to build extensible products and business models on top of DeFi with maximum security and composability.
**Our platform is open to all sizes of developers, from solo-coders to a group of hackers to globally-scaled teams**. Build compelling use cases and monetize their models to earn money by serving your users with high reliability.
## Prerequisite
- [web3 ](https://github.com/ethereum/web3.js/#installation ) installed.
- Instantiating web3
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```javascript
// in browser
if (window.ethereum) {
window.web3 = new Web3(window.ethereum)
} else if (window.web3) {
window.web3 = new Web3(window.web3.currentProvider)
} else {
window.web3 = new Web3(customProvider)
}
// in node.js
const web3 = new Web3(new Web3.providers.HttpProvider(ETH_NODE_URL))
```
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## Creating new DSA.
- Index Contract is the core contract of DSA and is a factory contract to deploy new DSA for users.
### .build()
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`function build(address _owner, uint accountVersion, address _origin)`
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| Parameter | Type | Description|
|--|--|--|
| `_owner` | address | Owner of the new DSA.
| `accountVersion` | uint | Version of the new DSA.
| `_origin` | address | Referral Address.
**Web3 Code Snippet to create new DSA.**
```javascript
let indexAddress = "0x2971adfa57b20e5a416ae5a708a8655a9c74f723"
let indexABI = [] // paste ABI from `https://github.com/InstaDApp/dsa-sdk/blob/master/src/abi/core/index.json`
let owner = "0x...."; // Owner of the DSA.
let version = 1; // Version of DSA.
let origin = "0x...."; // Referral Address for creating DSA.
new web3.eth.Contract(indexABI, indexAddress).methods
.build(owner, version, origin)
.send({
from: owner
})
.on("transactionHash", (txHash) => {
return txHash;
})
.on("error", (error) => {
return error;
});
```
## Interacting with Your DSA.
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Once DSA is created, You can interact with your DSA.
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### .cast()
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`function cast(address[] calldata _targets, bytes[] calldata _datas, address _origin)`
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| Parameter | Type | Description|
|--|--|--|
| `_targets` | address[] | Array of connector’
| `_datas` | bytes[] | Array of connector’
| `_origin` | address | Referral Address.
**Web3 Code Snippet to interact with DSA.**
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Deposit Asset in Compound Protocol and start earning Interest.
```javascript
// compound connector desposit function interface
let depositLogic = [{inputs:[{internalType:"address",name:"token",type:"address"},{internalType:"uint256",name:"amt",type:"uint256"},{internalType:"uint256",name:"getId",type:"uint256"},{internalType:"uint256", name:"setId",type:"uint256"}],name:"deposit",outputs:[],stateMutability:"payable",type:"function"}];
// compound connector address
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let CompoundAddress = "0x547f1508a2a1ab0cb84dce4b3e09beb560bb44cb";
let DSA_Address = "YOUR_DSA_ADDRESS" // Your DSA Address.
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let DSA_ABI = ["COPY_PASTE_DSA_ABI_HERE"] // ABI of DSA Contract.
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// You need to create callData of a specific function of connector.
let depositArgs = [
"TOKEN_ADDRESS", // address of the token to deposit.
"TOKEN_AMOUNT", // amount to deposit(Amount should be in wei).
"0", // It should be zero
"0" // It should be zero
];
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let depositCallData = web3.eth.abi.encodeFunctionCall(depositLogic, depositArgs);
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// Interacting with DSA.
new web3.eth.Contract(DSA_ABI, DSA_Address).methods
.cast(
[CompoundAddress], // need to be in array format
[depositArgs] // need to be in array format
).send({
from: address[0]
})
.on("transactionHash", (txHash) => {
return txHash;
})
.on("error", (error) => {
return error;
});
```
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**Note:** We use a mock address to indicate ETH in connectors: `0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE`
