# Polygon PoS quickstart

> Polygon quickstart guide

# Polygon PoS quickstart

This quickstart guide will help you set up and make calls on the Polygon network using the Infura endpoints.

<Banner>
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</Banner>

## Prerequisites

Ensure you have an [API key](/developer-tools/dashboard/get-started/create-api) with the Polygon network enabled.

## Make calls

### curl

Run the following command in your terminal, replacing `<YOUR-API-KEY>` with your actual Infura API key:

```bash
curl https://polygon-mainnet.infura.io/v3/<YOUR-API-KEY> \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc": "2.0", "method": "eth_blockNumber", "params": [], "id": 1}'
```

### Node (JavaScript)

In these examples, you'll use [npm](https://docs.npmjs.com/downloading-and-installing-node-js-and-npm) as your package manager.

#### Node Fetch

1. In your project folder, install the `node-fetch` package using npm:

   ```bash
   npm i node-fetch
   ```

1. Create your JavaScript file and copy the following code:

   Replace `<YOUR-API-KEY>` with your actual Infura API key.

   ```javascript title="index.js"

   fetch('https://polygon-mainnet.infura.io/v3/<YOUR-API-KEY>', {
     method: 'POST',
     headers: {
       'Content-Type': 'application/json',
     },
     body: JSON.stringify({
       jsonrpc: '2.0',
       method: 'eth_blockNumber',
       params: [],
       id: 1,
     }),
   })
     .then(response => response.json())
     .then(data => {
       console.log(data)
     })
     .catch(error => {
       console.error(error)
     })
   ```

1. Run the code using the following command:

   ```bash
   node index.js
   ```

#### Axios

1. In your project folder, install the `axios` package using npm:

   ```bash
   npm i axios
   ```

1. Create your JavaScript file and copy the following code:

   Replace `<YOUR-API-KEY>` with your actual Infura API key.

   ```javascript title="index.js"
   const axios = require('axios')

   axios
     .post('https://polygon-mainnet.infura.io/v3/<YOUR-API-KEY>', {
       jsonrpc: '2.0',
       method: 'eth_blockNumber',
       params: [],
       id: 1,
     })
     .then(response => {
       console.log(response.data)
     })
     .catch(error => {
       console.error(error)
     })
   ```

1. Run the code using the following command:

   ```bash
   node index.js
   ```

#### Ethers

1. In your project folder, install the `ethers` package using npm:

   ```bash
   npm install ethers
   ```

1. Create your JavaScript file and copy the following code:

   Replace `<YOUR-API-KEY>` with your actual Infura API key.

   ```javascript title="index.js"
   const ethers = require('ethers')

   const provider = new ethers.providers.JsonRpcProvider(
     'https://polygon-mainnet.infura.io/v3/<YOUR-API-KEY>'
   )

   provider
     .getBlockNumber()
     .then(blockNumber => {
       console.log(blockNumber)
     })
     .catch(error => {
       console.error(error)
     })
   ```

1. Run the code using the following command:

   ```bash
   node index.js
   ```

### Python

1. In your project folder, install the `requests` library:

   ```bash
   pip install requests
   ```

1. Create your Python file and copy the following code:

   Replace `<YOUR-API-KEY>` with your actual Infura API key.

   ```python title="index.py"

   url = "https://polygon-mainnet.infura.io/v3/<YOUR-API-KEY>"

   payload = {
     "jsonrpc": "2.0",
     "method": "eth_blockNumber",
     "params": [],
     "id": 1
   }

   headers = {"content-type": "application/json"}

   response = requests.post(url, data=json.dumps(payload), headers=headers).json()

   print(response)
   ```

1. Run the code using the following command:

   ```bash
   python index.py
   ```

## Next steps

Now that you have successfully made a call to the Polygon network, you can explore more functionalities and APIs provided
by Infura. Here are some suggestions:

- **Explore other Polygon APIs**: Infura supports a wide range of APIs. You can find more information in the
  [JSON-RPC API method documentation](json-rpc-methods/index.md).

- **Try out different networks**: Infura supports multiple networks including Arbitrum, Ethereum, Optimism, IPFS and more.

- **Monitor your usage**: Monitor your usage on the [Infura dashboard](/developer-tools/dashboard/how-to/dashboard-stats) to ensure you're not hitting your rate limits.

Remember, the MetaMask community is here to help. If you have any questions or run into any issues, check out the
[MetaMask community](https://community.metamask.io/) for help and answers to common questions.