Get blockchain insights from chat using GPT-4 and Nansen MCP
*This workflow contains community nodes that are only compatible with the self-hosted version of n8n.*
## How it works
This workflow listens for an incoming chat message and routes it to an **AI Agent**. The agent is powered by your preferred **Chat Model** (such as OpenAI or Anthropic) and extended with the **Nansen MCP** tool, which enables it to retrieve onchain wallet data, token movements, and address-level insights in real time.
The Nansen MCP tool uses **HTTP Streamable** transport and requires API Key authentication via **Header Auth**.
Read the Documentation: [https://docs.nansen.ai/nansen-mcp/overview](https://docs.nansen.ai/nansen-mcp/overview)
## Set up steps
1. **Get your Nansen MCP API key**
- Visit: [https://app.nansen.ai/account?tab=api](https://app.nansen.ai/account?tab=api)
- Generate and copy your personal API key.
2. **Create a credential for authentication**
- From the homepage, click the **dropdown next to "Create Workflow" → "Create Credential"**.
- Select `Header Auth` as the method.
- Set the **Header Name** to: `NANSEN-API-KEY`
- Paste your API key into the **Value** field.
- Save the credential (e.g., `Nansen MCP Credentials`).
3. **Configure the Nansen MCP tool**
- **Endpoint**: `https://mcp.nansen.ai/ra/mcp/`
- **Server Transport**: `HTTP Streamable`
- **Authentication**: `Header Auth`
- **Credential**: Select `Nansen MCP Credentials`
- **Tools to Include**: Leave as `All` (or restrict as needed)
4. **Configure the AI Agent**
- Connect your preferred **Chat Model** (e.g., OpenAI, Anthropic) to the `Chat Model` input.
- Connect the **Nansen MCP** tool to the `Tool` input.
- *(Optional)* Add a `Memory` block to preserve conversational context.
5. **Set up the chat trigger**
- Use the **"When chat message received"** node to start the flow when a message is received.
6. **Test your setup**
Try sending prompts like:
- `What tokens are being swapped by 0xabc...123?`
- `Get recent wallet activity for this address.`
- `Show top holders of token XYZ.`
