How to Use the Harmonyscan (Harmony One Block Explorer API) MCP in Claude

Q: What's the difference between gettxlist and gettxlistinternal?

Use gettxlist for a wallet's regular, external transactions, like sending ONE from one account to another. Use gettxlistinternal to see transactions initiated by smart contracts that involve that address.

Query Harmony One balances, contract ABIs, and transaction history right from your Claude Desktop chat, no context switching.

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Connect Harmonyscan (Harmony One Block Explorer API) MCP to Claude Desktop

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Setup Harmonyscan (Harmony One Block Explorer API) with Claude Desktop

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Check Wallet Balances Instantly

The `get_balance` tool lets you ask Claude for any Harmony wallet's ONE balance. You don't have to open a block explorer in your browser. Just ask a question like, "what's the balance of 0x...?" and get the number back. For bigger jobs, use `get_balance_multi` to check a whole list of addresses at once. Paste them into the chat, and your agent returns a clean list of their ONE balances. It's much faster than writing a script or checking them one by one through a web UI.

Dig into Transaction History

This MCP server gives Claude direct access to Harmony transaction logs. Use `get_tx_list` for an address's normal transactions or `get_tx_list_internal` for contract interactions. You can also pull all HRC20 token transfers for a wallet with the `get_token_tx` tool. Your agent can also check if a transaction went through. Give it a transaction hash and it uses `get_status` or `get_tx_receipt_status` to confirm its execution status. No more refreshing an explorer page waiting for confirmations to roll in.

Inspect Smart Contracts and Network Stats

Point your agent at a deployed contract address to pull its ABI with `get_abi` or its verified source code with `get_source_code`. This is great for understanding how a contract works without leaving your chat to go find it on an explorer. Beyond contracts, you can get a snapshot of the Harmony network itself. Ask for the current ONE price with `get_one_price` or the total circulating supply with `get_one_supply`. It's live data, available on demand.

Setup guide

Set up Harmonyscan (Harmony One Block Explorer API) MCP in Claude Web or Desktop

1

Open Claude Settings

Go to claude.ai, click your profile icon, then navigate to Customize → Connectors.
2

Add Custom Connector

Click the "+" button and select Add custom connector. Paste your Vinkius endpoint URL: https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. For OAuth-protected servers, expand Advanced settings to add credentials.
3

Start a conversation

Open a new chat. The Harmonyscan (Harmony One Block Explorer API) MCP tools are available immediately — no restart needed.

Endpoint URL

https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

No configuration file needed — paste the URL directly in the Claude web interface.

Available on Free (1 connector), Pro, Max, Team, and Enterprise plans.

Prerequisites

Claude Desktop installed (macOS or Windows)
Active Vinkius subscription with a valid endpoint token

1

Open Claude Desktop Settings

Click the menu icon at the top-left corner, go to Settings → Developer → Edit Config. This opens claude_desktop_config.json in your default text editor.
2

Paste the Harmonyscan (Harmony One Block Explorer API) MCP configuration

Copy the JSON snippet on the right into the mcpServers object. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Restart Claude Desktop

Close and reopen the application. Claude needs a full restart to load new MCPs — refreshing a conversation is not enough.
4

Verify the connection

Open a new conversation. Click the 🔌 icon at the bottom of the message input. You should see tools listed under harmonyscan-harmony-one-block-explorer-api-mcp.

json

{
  "mcpServers": {
    "harmonyscan-harmony-one-block-explorer-api-mcp": {
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

Get your connection token →

Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by Harmonyscan. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about Harmonyscan (Harmony One Block Explorer API) MCP in Claude Desktop

If you're using the Claude Desktop app, you can install this server as an extension from the settings menu. For the web version, just paste the MCP server URL into the Custom Connectors section of your settings. Your tools will show up right away.

Yes. Provide the transaction hash to your agent and tell it to use the `get_status` tool. It will return the execution status, telling you if the transaction was successful or failed.

Absolutely. Just give your agent the contract address and ask for the ABI. It will use the `get_abi` tool to fetch it directly from the Harmonyscan API and display it in your chat.

Use `get_tx_list` for a wallet's regular, external transactions, like sending ONE from one account to another. Use `get_tx_list_internal` to see transactions initiated by smart contracts that involve that address.

It only processes public Harmony One blockchain data like wallet addresses, transaction hashes, and block numbers that you provide in your prompts. Your Claude Desktop app connects to the Vinkius-managed server, which processes the query ephemerally. Nothing is stored.

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Connect this server to Cursor, Claude, VS Code, and more.

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