# Example EVM Price Feed Contract Deployment

Deploying and testing your contract using Hardhat is a straightforward process, especially with the deployment scripts provided in the [SEDA Starter Kit](https://github.com/sedaprotocol/seda-starter-kit/tree/main/integrations/evm-hardhat). We've implemented a deployment script using Hardhat Ignition to simplify the steps.

## Step 1: Set Up the Environment

Before deploying, ensure that your environment is configured correctly with the required `.env`, `hardhat.config.ts`, and `seda.config.ts` files. These files contain important variables and settings for the deployment process.

#### **`.env`**

The `.env` file holds sensitive data such as private keys and contract IDs. Ensure that you fill in the required values:

```bash
ORACLE_PROGRAM_ID=YOUR_ORACLE_PROGRAM_ID
EVM_PRIVATE_KEY=YOUR_EVM_PRIVATE_KEY

# Optional
BASE_SEPOLIA_ETHERSCAN_API_KEY=YOUR_BASESCAN_API_KEY
```

#### **`seda.config.ts`**

This configuration file specifies the `SedaProver` contract addresses for different networks. Below is an example configuration for several supported networks:

```typescript
export interface SedaConfig {
  coreAddress: string;
}

export const networkConfigs: { [network: string]: SedaConfig } = {
  // Proxy Core Addresses (SEDA mainnet)
  base: {
    coreAddress: '0xDF1fb5ACe711B16D90FC45776fF1bF02CEBc245D',
  },
  // Proxy Core Addresses (SEDA testnet)
  baseSepolia: {
    coreAddress: '0xffDB1d9bBE4D56780143428450c4C2058061E6F3',
  },
  superseedSepolia: {
    coreAddress: '0xE08989FB730E072689b4885c2a62AE5f1fc787F2',
  },
  chiado: {
    coreAddress: '0xbe2ace709959C121759d553cACf7e6532C25a3aA',
  },
  hyperliquidPurrsec: {
    coreAddress: '0x23c01fe3C1b7409A98bBd39a7c9e5C2263C64b59',
  },
};

```

Make sure to add the correct `coreAddress` for each network you're working with. You can find the latest deployed addresses here:

{% content-ref url="/pages/Tg1KKu2SbXyCDSppn5Te" %}
[Prover Contract Deployments](/home/technology/seda-network-architecture/seda-core/seda-core-infrastructure-overview/prover-contract-deployments.md)
{% endcontent-ref %}

#### **Hardhat Network Setup**

Your Hardhat network configuration should follow the standard setup. Refer to the Hardhat documentation for detailed guidance on configuring networks in `hardhat.config.ts`.

## Step 2: Deploy the Contract

Once your environment is set up, use Hardhat to deploy the `PriceFeed` contract. Ensure that you’ve defined the necessary environment variables, including `ORACLE_PROGRAM_ID` and `EVM_PRIVATE_KEY`, which are essential for deployment.

Run the following command to deploy the contract using Hardhat Ignition:

```bash
bunx hardhat pricefeed deploy --network baseSepolia --verify
```

After confirming the deployment, Hardhat Ignition will execute the deployment and provide the deployed contract address:

```bash
Using SEDA Core address from config: 0xffDB1d9bBE4D56780143428450c4C2058061E6F3
Using Oracle Program ID from environment: 0x5d899b1daa6811586cbf8afd2774c56489a9046f0b31db2bf37ddfeb1430f811

Deploying PriceFeed contract...

PriceFeed deployed successfully:
- Contract Address: 0xBdba4A677E64526B87BAEA5f61D6f9be27711576
- SEDA Core Address: 0xffDB1d9bBE4D56780143428450c4C2058061E6F3
- Oracle Program ID: 0x5d899b1daa6811586cbf8afd2774c56489a9046f0b31db2bf37ddfeb1430f811

Deployment information saved to /workspaces/seda-starter-kit/integrations/evm-hardhat/deployments/addresses.json
Network key: baseSepolia-84532
```

If you use the `--verify` flag, Hardhat will also verify the contract on the blockchain explorer, providing a link to view the verified contract code:

```bash
Verifying contract on block explorer...
Successfully submitted source code for contract
contracts/PriceFeed.sol:PriceFeed at 0xBdba4A677E64526B87BAEA5f61D6f9be27711576
for verification on the block explorer. Waiting for verification result...

Successfully verified contract PriceFeed on the block explorer.
https://sepolia.basescan.org/address/0xBdba4A677E64526B87BAEA5f61D6f9be27711576#code
```

## Step 3: Post a Data Request

Once the contract is deployed, you can start posting data requests and interacting with the `PriceFeed` contract.

The starter kit includes tasks to simplify this process. To view available tasks, run:

```
bunx hardhat pricefeed --help                               
Hardhat version 2.26.1

Usage: hardhat [GLOBAL OPTIONS] pricefeed <TASK> [TASK OPTIONS]

AVAILABLE TASKS:

  deploy        Deploys the PriceFeed contract
  latest        Calls the latestAnswer function on the PriceFeed contract
  transmit      Calls the transmit function on the PriceFeed contract

pricefeed: Interact with the PriceFeed contract

For global options help run: hardhat help
```

For example, to post a data request on Base Sepolia, run:

```
bunx hardhat pricefeed transmit --network baseSepolia
```

Output:

```bash
No contract address specified, fetching from previous deployments...
Contract found: 0xEDE0dCB7C96353c0e5126A21EC850A8D94E7d436

Calling transmit() on PriceFeed at 0xBdba4A677E64526B87BAEA5f61D6f9be27711576...

Fees (ETH):
- Request Fee: 0.0001
- Result Fee: 0.0001
- Batch Fee: 0.0001
- Total: 0.0003

Request submitted successfully!
Request ID: 0xb9a0bbc2a1faba1f0259851b4ae7724f40cbfd1739fe3b083df72facc05361e6
```

If not specified, the script will fetch the contract address from the previous deployments.

## Step 4: Read the Latest Answer

After the data request has been processed by the SEDA network, you can retrieve the result by calling the `latestAnswer` function. This will fetch the data from the network:

```bash
bunx hardhat pricefeed latest --network baseSepolia
```

Output:

```bash
No contract address specified, fetching from previous deployments...
Contract found: 0xBdba4A677E64526B87BAEA5f61D6f9be27711576

Calling latestAnswer() on PriceFeed at 0xBdba4A677E64526B87BAEA5f61D6f9be27711576
Latest Answer: 3865600000
```

With these steps, you’ve successfully deployed, posted data requests, and retrieved results using the `PriceFeed` contract on the SEDA network. Combining these deployment and interaction scripts allows for a smooth integration into your application.


---

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