0_plain.py

import requests

assets = ['blockport', 'iota', 'bitcoin', 'litecoin', 'ethereum', 'bitcoin-cash', 'ripple',
          'eos', 'neo', 'tron', 'aelf', 'monero']

for asset in assets:
    res = requests.get(f'https://api.coincap.io/v2/assets/{asset}/history?interval=d1')
    res.text

1_threaded.py

import concurrent.futures
import requests

def get_asset(asset):
    res = requests.get(f'https://api.coincap.io/v2/assets/{asset}/history?interval=d1')
    return res.text

with concurrent.futures.ThreadPoolExecutor() as executor:

    assets = ['blockport', 'iota', 'bitcoin', 'litecoin', 'ethereum', 'bitcoin-cash', 'ripple',
              'eos', 'neo', 'tron', 'aelf', 'monero']

    for future in [executor.submit(get_asset, a) for a in assets]:
        future.result()

2_async.py

import aiohttp
import asyncio

async def run():
    async with aiohttp.ClientSession() as session:

        async def get_asset(asset):
            url = f'https://api.coincap.io/v2/assets/{asset}/history?interval=d1'
            async with session.get(url) as res:
                return await res.text()

        assets = ['blockport', 'iota', 'bitcoin', 'litecoin', 'ethereum', 'bitcoin-cash', 'ripple',
                  'eos', 'neo', 'tron', 'aelf', 'monero']

        await asyncio.gather(*(get_asset(a) for a in assets))

asyncio.run(run())

$ time python plain.py
real    0m2.888s
user    0m0.406s
sys     0m0.563s

$ time python threaded.py
real    0m1.051s
user    0m0.438s
sys     0m0.469s

$ time python async.py
real    0m1.074s
user    0m0.203s
sys     0m0.375s