OpenAI Agent Setup with Basic Tool Calling

Initialize your OpenAI Agent using the Assistants API. Define a `TransactionMonitor` agent with a tool called `fetch_transactions` that simulates fetching recent crypto transactions from an `Enterprise Transaction API`. Implement a basic `check_compliance` function that the agent can call. Your agent should be able to process a simple query like 'Are there any suspicious transactions?'

```python
from openai import OpenAI

client = OpenAI()

# Assume client.beta.assistants is available for Assistants API
assistant = client.beta.assistants.create(
    name="TransactionMonitor",
    instructions="You are an expert financial compliance officer. You use provided tools to monitor transactions for suspicious activity.",
    model="gpt-4o",
    tools=[
        {
            "type": "function",
            "function": {
                "name": "fetch_transactions",
                "description": "Fetches recent crypto transactions from the Enterprise Transaction API.",
                "parameters": {
                    "type": "object",
                    "properties": {
                        "start_time": {"type": "string"}
                    },
                    "required": ["start_time"]
                },
            },
        },
        # More tools will go here
    ],
)
# ... rest of the assistant interaction code
```