How do I search for an instrument if I don't have the ISIN?

Use the `search_market_instruments` tool with a keyword like 'Apple' or 'Tesla' to retrieve a list of matching assets and their unique ISINs.

Do I need to activate an order after placing it?

Yes, lemon.markets usually requires orders to be explicitly activated using the `activate_pending_order` tool before they are sent to the exchange.

Can I see my current portfolio positions?

Absolutely. Use the `list_active_positions` tool to retrieve a list of all instruments you currently hold in your brokerage account.

lemon.markets MCP Server for Pydantic AI 8 tools — connect in under 2 minutes

Name: lemon.markets
Availability: InStock
Author: Vinkius

ai.pydantic.dev/mcp

Built by Vinkius GDPR 8 Tools SDK

Pydantic AI brings type-safe agent development to Python with first-class MCP support. Connect lemon.markets through the Vinkius and every tool is automatically validated against Pydantic schemas — catch errors at build time, not in production.

Get MCP Server for AI Agents

ASK AI ABOUT THIS MCP SERVER

Open in ChatGPT Open in Claude Open in Perplexity

Vinkius supports streamable HTTP and SSE.

python

import asyncio
from pydantic_ai import Agent
from pydantic_ai.mcp import MCPServerHTTP

async def main():
    # Your Vinkius token — get it at cloud.vinkius.com
    server = MCPServerHTTP(url="https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp")

    agent = Agent(
        model="openai:gpt-4o",
        mcp_servers=[server],
        system_prompt=(
            "You are an assistant with access to lemon.markets "
            "(8 tools)."
        ),
    )

    result = await agent.run(
        "What tools are available in lemon.markets?"
    )
    print(result.data)

asyncio.run(main())

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* Every MCP server runs on Vinkius-managed infrastructure inside AWS - a purpose-built runtime with per-request V8 isolates, Ed25519 signed audit chains, and sub-40ms cold starts optimized for native MCP execution. See our infrastructure

About lemon.markets MCP Server

Connect your lemon.markets account to any AI agent to automate your stock trading and market analysis. This MCP server enables your agent to search for instruments, retrieve real-time quotes, and manage your brokerage orders directly.

Pydantic AI validates every lemon.markets tool response against typed schemas, catching data inconsistencies at build time. Connect 8 tools through the Vinkius and switch between OpenAI, Anthropic, or Gemini without changing your integration code — full type safety, structured output guarantees, and dependency injection for testable agents.

What you can do

Market Discovery — Search for European stocks and ETFs by name or ISIN across major exchanges
Real-time Pricing — Get the latest bid/ask quotes and price data for any tradable instrument
Portfolio Oversight — List your active positions and retrieve detailed account balance information
Order Execution — Place, activate, and cancel buy or sell orders directly from natural language
Trading History — Monitor your order status and transaction history to track your investment performance

The lemon.markets MCP Server exposes 8 tools through the Vinkius. Connect it to Pydantic AI in under two minutes — no API keys to rotate, no infrastructure to provision, no vendor lock-in. Your configuration, your data, your control.

How to Connect lemon.markets to Pydantic AI via MCP

Follow these steps to integrate the lemon.markets MCP Server with Pydantic AI.

Install Pydantic AI

Run pip install pydantic-ai

Replace the token

Replace [YOUR_TOKEN_HERE] with your Vinkius token

Run the agent

Save to agent.py and run: python agent.py

Explore tools

The agent discovers 8 tools from lemon.markets with type-safe schemas

Why Use Pydantic AI with the lemon.markets MCP Server

Pydantic AI provides unique advantages when paired with lemon.markets through the Model Context Protocol.

Full type safety: every MCP tool response is validated against Pydantic models, catching data inconsistencies before they reach your application

Model-agnostic architecture — switch between OpenAI, Anthropic, or Gemini without changing your lemon.markets integration code

Structured output guarantee: Pydantic AI ensures tool results conform to defined schemas, eliminating runtime type errors

Dependency injection system cleanly separates your lemon.markets connection logic from agent behavior for testable, maintainable code

lemon.markets + Pydantic AI Use Cases

Practical scenarios where Pydantic AI combined with the lemon.markets MCP Server delivers measurable value.

Type-safe data pipelines: query lemon.markets with guaranteed response schemas, feeding validated data into downstream processing

API orchestration: chain multiple lemon.markets tool calls with Pydantic validation at each step to ensure data integrity end-to-end

Production monitoring: build validated alert agents that query lemon.markets and output structured, schema-compliant notifications

Testing and QA: use Pydantic AI's dependency injection to mock lemon.markets responses and write comprehensive agent tests

lemon.markets MCP Tools for Pydantic AI (8)

These 8 tools become available when you connect lemon.markets to Pydantic AI via MCP:

activate_pending_order

Activate a placed order to execute it

cancel_open_order

Cancel an open order

get_brokerage_account

markets trading account. Get trading account information

get_latest_quote

Get the latest bid/ask prices for an instrument

list_active_positions

List all currently held portfolio positions

list_brokerage_orders

List recent trading orders

place_new_order

Note: Orders must usually be activated after creation. Place a new buy or sell order

search_market_instruments

g., "Apple", "Tesla", or a specific ISIN). Search for stocks or ETFs on lemon.markets

Example Prompts for lemon.markets in Pydantic AI

Ready-to-use prompts you can give your Pydantic AI agent to start working with lemon.markets immediately.

"Find the ISIN for 'Volkswagen' on lemon.markets."

"Get the latest ask price for Tesla (ISIN: 'US88160R1014')."

"List my active trading orders."

Troubleshooting lemon.markets MCP Server with Pydantic AI

Common issues when connecting lemon.markets to Pydantic AI through the Vinkius, and how to resolve them.

MCPServerHTTP not found

Update: pip install --upgrade pydantic-ai

lemon.markets + Pydantic AI FAQ

Common questions about integrating lemon.markets MCP Server with Pydantic AI.

How does Pydantic AI discover MCP tools?

Create an MCPServerHTTP instance with the server URL. Pydantic AI connects, discovers all tools, and generates typed Python interfaces automatically.

Does Pydantic AI validate MCP tool responses?

Yes. When you define result types as Pydantic models, every tool response is validated against the schema. Invalid data raises a clear error instead of silently corrupting your pipeline.

Can I switch LLM providers without changing MCP code?

Absolutely. Pydantic AI abstracts the model layer — your lemon.markets MCP integration works identically with OpenAI, Anthropic, Google, or any supported provider.