> For the complete documentation index, see [llms.txt](https://worldkoisan.gitbook.io/koisan-international-coin/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://worldkoisan.gitbook.io/koisan-international-coin/koisan-chain/node/on-chain-interaction.md).

# On-Chain Interaction

Koisan is compatible with Ethereum's ecosystem，support all Ethereum's RPC API and DK.

## RPC

[RPC Method List](https://eth.wiki/json-rpc/api)

Example:

```
curl -s -H 'content-type:application/json' -d '{"jsonrpc":"2.0","method":"web3_clientVersion","params":[],"id":67}' http://localhost:8545
```

## SDK

Use `Ethereum` SDK library such as `web3j`,`web3js`, etc for development.

### Get chain info <a href="#get-chain-info" id="get-chain-info"></a>

```
const Web3 = require('web3')

async function getChainId() {
    const web3 = new Web3('https://rpc.koisan-chain.com')
    let chainId = await web3.eth.getChainId()
    console.log(`chain id: ${chainId}`)
    return chainId
}
```

### Generate Account

```
const Web3Accounts = require('web3-eth-accounts')

let account = new Web3Accounts().create()
//do not do this on prd env
console.log(`account generated. address: ${account.address}, private key: ${account.privateKey}`)
```

### Built Transaction

```
const Web3 = require('web3')

async function transfer(fromAccount, to, value){
    const web3 = new Web3('https://rpc.koisan-chain.com')
    let chainId = await web3.eth.getChainId()
    let nonce = await web3.eth.getTransactionCount(fromAccount.address)
    let gasPrice = await web3.eth.getGasPrice()

    let unsigned = {
        from: fromAccount.address,
        to,
        value: web3.utils.numberToHex(web3.utils.toWei(value, 'ether')),
        gasPrice,
        nonce,
        chainId,
    }

    unsigned.gas = await web3.eth.estimateGas(unsigned)

    let signed = await fromAccount.signTransaction(unsigned)
    return signed
}
```