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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Atlas API Integration Wrapper
# Description: A high-demand, production-ready developer code asset for integrating Atlas API with FastAPI and Pydantic v2.
# Author: Elite Software Architect and Micro-SaaS Developer

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
from typing import Optional
import requests
import json

# Define the Atlas API endpoint and API key
ATLAS_API_ENDPOINT = "https://api.atlas.com/v1"
ATLAS_API_KEY = "YOUR_ATLAS_API_KEY"

# Define the FastAPI application
app = FastAPI()

# Define the Pydantic model for the Atlas API request
class AtlasRequest(BaseModel):
    """Atlas API request model"""
    query: str
    latitude: float
    longitude: float
    radius: Optional[float] = None

# Define the Pydantic model for the Atlas API response
class AtlasResponse(BaseModel):
    """Atlas API response model"""
    results: list
    status: str

# Define the API endpoint for the Atlas API integration
@app.post("/atlas/search")
async def atlas_search(request: AtlasRequest):
    """
    Atlas API

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