> For the complete documentation index, see [llms.txt](https://docs.gr1d.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.gr1d.network/circuit-nodes-101/power-your-circuit-node/circuit-node-sale-contract.md).

# Circuit Node Sale Contract

Here’s the revised page for the **Circuit Node Sale** contract, tailored to the **Ethereum Sepolia Testnet** and updated to reflect the latest deployment details:

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## **Circuit Node Sale Contract Guide**

This guide walks you through interacting with the **Circuit Node Sale contract**, deployed on the **Ethereum Sepolia Testnet**. We’ll cover how to access the contract, read the price, and purchase node licenses.

#### **Contract Details**

* **Circuit Node Sale Contract (Sepolia Testnet)**:\
  [0xA338BB7Ded469dF044390403c1Bec3D699B546D4](https://sepolia.etherscan.io/address/0xA338BB7Ded469dF044390403c1Bec3D699B546D4#readContract)

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### **How to Read the Circuit License Chip Price**

The **Circuit License Chip contract** price is dynamic. Use the steps below to get the latest price for the number of keys (licenses) you want to buy.

#### **Steps to Read the Node License Price**

1. **Go to the Node License contract** on [etherscan](https://sepolia.etherscan.io/address/0xA338BB7Ded469dF044390403c1Bec3D699B546D4#readContract).
2. **Scroll down** to **“17. price”** in the **Read Contract** section.
   * **Input**: Enter the number of keys (licenses) you want to purchase.
   * **Output**: The **uint256 value** returned represents the price in **Wei**.
3. **Convert the Wei value to Ether** using an [Ethereum Unit Converter](https://eth-converter.com).
   * **Example**:
     * Wei value: `220986939450000000`
     * Converted to Ether: `0.22098693945 ETH`

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### **Purchasing Circuit License Chip**

After retrieving the price for the number of licenses, follow these steps to make a purchase using the **Circuit License Chip contract** on Ethereum Sepolia.

#### **Steps to Purchase Circuit License Chips**

1. **Connect to the Node License contract** on [etherscan](https://sepolia.etherscan.io/address/0xA338BB7Ded469dF044390403c1Bec3D699B546D4#readContract)
   * Use a **Web3 wallet** (e.g., MetaMask) connected to the Ethereum Sepolia network.
2. **Go to the “5. mint” function** under the **Write Contract** section.
3. **Enter the following inputs:**
   * **Wei value**: Paste the price you calculated in the previous step.
   * **\_amount (uint256)**: Enter the number of keys (licenses) you want to mint.
4. **Click “Write”** to submit the transaction.
5. **Approve the transaction** in your connected wallet.

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### **Verifying Purchase on Sepolia Testnet**

After purchasing, you can verify the transaction by interacting with the **GRIDNodeSale** contract on the **Sepolia Testnet**.

#### **Steps to Verify:**

1. **Open the GRIDNodeSale contract** on [Sepolia Etherscan](https://sepolia.etherscan.io/address/0xA338BB7Ded469dF044390403c1Bec3D699B546D4#readContract).
2. **Use the Read Contract section** to:
   * **Check ownership** of licenses.
   * **Retrieve license data** based on your wallet address.

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### **Troubleshooting**

* **Insufficient Gas**: Ensure your wallet has enough **ETH** on Sepolia for gas fees.
* **Transaction Errors**: Verify the **price input** in Wei and ensure it's correctly converted from Ether.