All Together Now

async_crypto.py

import asyncio
import aiohttp

CRYPTOS: List[str] = [
    "BTC",
    "ETH",
    "DOGE",
    "BCH",
    "ETC",
    "LTC",
]
URLS: List[str] = [
    f"https://api.coinbase.com/v2/prices/{crypto}-USD/buy"
    for crypto in CRYPTOS
]

async def request_urls(urls: List[str]):
    async with aiohttp.ClientSession() as session:
        tasks: List[asyncio.Task] = []
        for url in urls:
            tasks.append(
                asyncio.ensure_future(
                    get_url(session, url)
                )
            )
        return await asyncio.gather(*tasks)

async def get_url(session: aiohttp.ClientSession, url: str) -> Dict:
    async with session.get(url) as response:
        return await response.json()

responses: List[Dict] = asyncio.run(request_urls(URLS))
print(responses)