I wan to write some auto trade bot by API，but before I complete the code,Can I use a Simulation account to open the API to access the Simulation environment?
but I regist a Account withou live ,the API access is unavailable，Is that mean I need has a live account with $1000 and buy the api right in $25/month ,so I can test with Simulation env？ or there has another way to access Simulation env？
You must meet all those guidelines to in order to subscribe to API Access. You can go back below the $1000 equity limit afterward, you just need that much in your account to subscribe. Once you have that, you can access the API in simulation mode indefinitely as long as you’re paying the monthly subscription fee.