Does anyone know of a 3rd party API that can get the market prices and consider it's Float and Phase? Really appreciate answers.. Thanks. And does anyone know if Steamanalyst can track the prices of items with different Float and Phase ?
1. For authenticating users through Steam's OpenID provider, you can use the attached PHP class. I don't know where it originally came from, but it works well (although it could benefit from being updated to use curl instead of file_get_contents). This particular version of it was edited by me to authenticate the return domain, otherwise you could be vulnerable to spoof attacks. For logging in a bot to Steam, you can use steam-user or steamcommunity. Or if you really want to, you can look at the source of those to see what they do to implement it yourself.
2. It polls however frequently you tell it to. The rate-limit on the API domain is much higher than on the community domain. You can reasonably safely poll every 1-2 seconds, although for sake of being a good citizen, you probably don't want to do that. SteamSignIn.php