Currently Govt has open sourced covid vaccine availability API’s in India as given here, Vaccine slots are limited and difficult to know when those slots gets opened. Here is simple bot created to monitor the vaccine slots and notify interested users when those slots are available.
#!/usr/bin/env python3
import json,urllib3,datetime,time,logging,telegram,configparser
config = configparser.ConfigParser()
config.read_file(open('api.conf'))
weburl = config.get('cowin', 'url')
TOKEN = config.get('telegram', 'token')
CHAT_ID = config.get('telegram', 'chat_id')
x=datetime.datetime.now()
day=x.strftime("%d-%m-%Y")
weburl+=day
http = urllib3.PoolManager()
logging.basicConfig(filename='./vaccine.log',level=logging.INFO,format='%(asctime)s %(message)s')
bot = telegram.Bot(token=TOKEN)
while True:
found=0
try:
response = http.request('GET', weburl)
json_data = json.loads(response.data)
except Exception as ex:
logging.info("API is not responding!")
time.sleep(10)
continue
for x in json_data['centers']:
for y in x['sessions']:
if y['min_age_limit'] == 18 and y['available_capacity'] > 0:
#print(y)
message = '18+ vaccine available in #BBMP: '+ str(x['pincode']) +' '+ str(y['date'])+ ' ' + x['name'] +' Avail slots: '+ str(y['available_capacity'])
logging.info(message)
bot.sendMessage(chat_id = CHAT_ID, text =message)
found=1
break
else:
continue
break
if (found == 0):
time.sleep(4)
else:
continue
API is enforcing 100 calls/5 mins rate limit per IP, which translates to 1 call/3 seconds,hence after every iteration, the bot sleeps for 4 seconds Incase slots are open ( found=1), need to validate and alert without this 4 seconds delay, hence utilizes double break points and skips the 4 seconds delay with found=1 flag
Example snapshot of the telegram alerts is as follows: 
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