API Questions

I have some questions API v2:

1. How often does items update? (Quantity, value, etc ) /Items..
2. I am using a Limited key (via TornPDA), to do API Items call, also tested it on Swagger site. It keeps giving me error 2, it must be a public key? Shouldn't a limited API key also work because it has more access? 
3. Is there, or will there be a API Call fir a user to check their rig info? If not would you please consider implementing it? (Bruteforce strength, power, mips, etc)
4. I cant find the API to check stock prices? Is there a command ti check it? 

Any information appreciated, thank you. 

1. How often does items update? (Quantity, value, etc ) /Items..
   
   daily, I think 15 mins after 00:00TCT reset
2. I am using a Limited key (via TornPDA), to do API Items call, also tested it on Swagger site. It keeps giving me error 2, it must be a public key? Shouldn't a limited API key also work because it has more access? 
   
   probably a mistake from your side. swagger you need to click the authorise button at the top. using full url you can append &key={key}
3. I cant find the API to check stock prices? Is there a command ti check it? 
   
   https://api.torn.com/torn/?selections=stocks&key={key}