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import asyncio
import aiohttp

CRYPTOS: List[str] = [
    "BTC",
    "ETH",
    "DOGE",
    "BCH",
    "ETC",
    "LTC",

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$ python3 async_crypto.py
[{'data': {'base': 'BTC', 'currency': 'USD', 'amount': '58995.78'}}, 
{'data': {'base': 'ETH', 'currency': 'USD', 'amount': '4467.16'}}, 
{'data': {'base': 'DOGE', 'currency': 'USD', 'amount': '0.22'}}, 
{'data': {'base': 'BCH', 'currency': 'USD', 'amount': '582.49'}}, 
{'data': {'base': 'ETC', 'currency': 'USD', 'amount': '48.59'}}, 
{'data': {'base': 'LTC', 'currency': 'USD', 'amount': '208.84'}}]

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from time import time

responses: List[Dict] = []

start_time: float = time()

for url in URLS:
    responses.append(requests.get(url).json())

end_time: float = time()

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

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async def request_urls(urls: List[str]):
    tasks: List[asyncio.Task] = []
    ...
        return await asyncio.gather(*tasks)

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task: asyncio.Task = asyncio.ensure_future(
    get_url(session, url)
)

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async with aiohttp.ClientSession(
    headers=headers_dict,
    cookies=cookies_dict,
    trace_configs=[trace_config],
) as session:
    ...

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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)

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async with session.post(url, data=payload) as response:
    ...

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...
async with session.get(url) as response:
    if response.status == 503:
	# do some work