AI Agent with MCP

npm install -g @chainstream/mcp-server

{
  "mcpServers": {
    "chainstream": {
      "url": "https://mcp.chainstream.io/mcp",
      "headers": {
        "Authorization": "Bearer your_access_token"
      }
    }
  }
}

User: Show me the ETH price

Claude: [Calls get_token_price tool]

ETH Current Price:
- Price: $2,015.32
- 24h Change: +2.5%
- 24h Volume: $12.5B
- Market Cap: $242B

User: Analyze the holdings of 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045

Claude: [Calls get_token_balance and analyze_wallet tools]

This address (vitalik.eth) holdings analysis:

Holdings Overview
| Token | Amount | Value |
|-------|--------|-------|
| ETH | 1,234 | $2.48M |
| USDC | 50,000 | $50K |
| ENS | 10,000 | $25K |

Wallet Characteristics
- Wallet Age: 7+ years
- Tags: Core Developer, Long-term Holder
- Main Activities: DeFi, NFT, Donations

User: Which Smart Money addresses have been buying ARB recently?

Claude: [Calls get_smart_money_activities tool]

Past 24h Smart Money ARB Buy Records:

1. 0xabc...123 (Smart Score: 92)
   - Bought: 500,000 ARB ($450K)
   - Time: 2 hours ago
   - Tags: DeFi Expert, High Win-rate Trader

2. 0xdef...456 (Smart Score: 85)
   - Bought: 200,000 ARB ($180K)
   - Time: 5 hours ago
   - Tags: Institutional Wallet

Trend Analysis: Smart Money overall shows net buying stance on ARB

User: First check this address's holdings, then analyze its recent trades, 
and determine its investment style

Claude: I'll analyze step by step:

Step 1: Holdings Query
[Calls get_token_balance]
...

Step 2: Transaction History
[Calls get_transaction_history]
...

Step 3: Comprehensive Analysis
[Calls analyze_wallet]

Based on the above data, this address's investment style is:
- Type: Medium to Long-term Holder
- Preference: DeFi Blue Chips + Layer2
- Risk Appetite: Moderate
- Characteristic: Good at adding positions during pullbacks

User: Compare the trading strategies of these two addresses

Claude: [Calls analyze_wallet x2]

| Dimension | Address A | Address B |
|-----------|-----------|-----------|
| Trading Frequency | High (50/day) | Low (5/day) |
| Holding Style | Short-term | Long-term |
| Win Rate | 62% | 78% |
| Preferred Sector | Meme Coins | DeFi |
| Risk Level | High | Medium |

User: Buy 100 USDC worth of ETH for me

Claude: I can help you query the current ETH price and best trading routes,
but cannot execute trades directly.

Current ETH price: $2,015
Suggested execution methods:
1. Uniswap V3 - Expected slippage 0.1%
2. 1inch Aggregator - May get better price

Please execute the trade manually in your wallet.

import Anthropic from '@anthropic-ai/sdk';
import { Client } from '@modelcontextprotocol/sdk/client/index.js';
import { SSEClientTransport } from '@modelcontextprotocol/sdk/client/sse.js';

const anthropic = new Anthropic();

// Initialize MCP Client
async function createMcpClient() {
  const transport = new SSEClientTransport(
    new URL('https://mcp.chainstream.io/sse'),
    {
      requestInit: {
        headers: {
          'Authorization': `Bearer ${process.env.CHAINSTREAM_ACCESS_TOKEN}`
        }
      }
    }
  );

  const client = new Client({
    name: 'custom-agent',
    version: '1.0.0'
  });

  await client.connect(transport);
  return client;
}

async function chat(userMessage) {
  const mcp = await createMcpClient();

  // Get available tools
  const { tools } = await mcp.listTools();

  // Convert to Anthropic format
  const anthropicTools = tools.map(tool => ({
    name: tool.name,
    description: tool.description,
    input_schema: tool.inputSchema
  }));

  // Call Claude
  let response = await anthropic.messages.create({
    model: 'claude-sonnet-4-20250514',
    max_tokens: 1024,
    tools: anthropicTools,
    messages: [{ role: 'user', content: userMessage }]
  });

  // Handle tool calls
  while (response.stop_reason === 'tool_use') {
    const toolUse = response.content.find(c => c.type === 'tool_use');

    // Call MCP tool
    const toolResult = await mcp.callTool({
      name: toolUse.name,
      arguments: toolUse.input
    });

    // Continue conversation with tool result
    response = await anthropic.messages.create({
      model: 'claude-sonnet-4-20250514',
      max_tokens: 1024,
      tools: anthropicTools,
      messages: [
        { role: 'user', content: userMessage },
        { role: 'assistant', content: response.content },
        {
          role: 'user',
          content: [{
            type: 'tool_result',
            tool_use_id: toolUse.id,
            content: JSON.stringify(toolResult.content)
          }]
        }
      ]
    });
  }

  await mcp.close();

  return response.content.find(c => c.type === 'text')?.text;
}

// Usage
const result = await chat('Check ETH price on Ethereum');
console.log(result);