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Polygon RPC Integration Guide: How to Add Polygon to a Wallet 

Today, Polygon (POL) is a highly scalable and developer-friendly blockchain network. Moreover, to enable seamless interaction between wallets and the Polygon network, integrating via JSON-RPC is essential. This guide will walk you through the process using NOWNodes’ Polygon RPC endpoints, covering all the necessary methods for a fully functional wallet integration.

Step 1: Set Up Polygon RPC Endpoint

For the first step, before making any JSON-RPC calls, you need a working Polygon RPC endpoint from NOWNodes:

  • Polygon Mainnet RPC URL:https://matic.nownodes.io/YOUR_API_KEY

So, add this URL to your wallet configuration as the primary Polygon RPC provider.

Note: Replace YOUR_API_KEY with your NOWNodes API key. If you don’t have one, get it here.

Step 2: RPC Methods for Wallet Integration

For the second step, for a wallet to fully support Polygon, it must implement the following JSON-RPC methods:

1. Account & Balance Management

  • Lists wallet-controlled addresses (used for connection status)- eth_accounts
  • Retrieves the POL balance of a given address – eth_getBalance 
  • Queries smart contract data (e.g., ERC-20 token balances) – eth_call

2. Transaction Handling

  • eth_getTransactionCount – Gets the transaction count (nonce) for an address.
  • eth_estimateGas – Estimates the gas required for a transaction.
  • eth_sendRawTransaction – Broadcasts a signed transaction to the network.
  • eth_getTransactionReceipt – Checks transaction status and logs after submission.

3. Blockchain Data & Sync Status

  • eth_blockNumber – Returns the latest block number.
  • eth_getBlockByNumber – Retrieves block details by number.
  • eth_syncing – Checks if the node is syncing with the network.

4. Real-Time Updates (Optional, WebSocket-Based)

  • eth_subscribe – Subscribes to events (new blocks, pending transactions, logs).
  • eth_unsubscribe – Cancels an active subscription.

Step 3: WebSocket Integration for Live Features

For real-time updates (e.g., instant balance changes, pending transactions), use NOWNodes’ WebSocket endpoint:

wss://matic.nownodes.io/YOUR_API_KEY

Use cases:

  • Live transaction confirmations
  • Instant balance refreshes
  • Smart contract event tracking

Step 4: Testing & Monitoring

And the last, after integration, ensure:
✅ Fast response times from the RPC server
✅ Accurate transaction confirmations (eth_getTransactionReceipt)
✅ Correct gas estimations (eth_estimateGas)
✅ Proper nonce handling (eth_getTransactionCount)

In other words, NOWNodes guarantees 99.95% uptime, making it ideal for production-grade wallets.

In this case, here’s example Wallet Integration Flow
  1. Connect Wallet → eth_accounts
  2. Fetch Balances → eth_getBalance (POL) + eth_call (ERC-20 tokens)
  3. Prepare Transaction → eth_getTransactionCount (nonce) + eth_estimateGas
  4. Send Transaction → eth_sendRawTransaction
  5. Confirm Transaction → eth_getTransactionReceipt
  6. (Optional) Live Updates → eth_subscribe (new blocks, pending txs)

Conclusion

In conclusion, integrating Polygon via NOWNodes RPC gives developers a maintenance-free solution – we handle all network upgrades and infrastructure optimizations automatically.

According to optimal performance, utilizing WebSocket endpoints enables real-time data synchronization, enhancing user experience with instant updates. Therefore, NOWNodes’ high-availability RPC service ensures reliable connectivity, making it an ideal choice for production-grade wallet integrations. Moreover, you would stay updated on the latest changes through NOWNodes Telegram channel while enjoying 99.95% uptime and enterprise-grade reliability.

Get started today and streamline your Polygon wallet integration with NOWNodes.

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