{"name":"AI Tutor TTS API","version":"3.0.0","flow":{"1":"Register: POST /auth/register","2":"Login: POST /auth/login → get session token","3":"Create API key: POST /keys (with session)","4":"Use TTS: POST /synthesize (with API key)"},"pricing":{"per_1000_chars":0.015,"per_request":0.001,"free_tier_chars":10000},"plans":{"free":{"monthly_chars":10000,"rate_limit_per_min":5,"max_api_keys":3,"price":0},"starter":{"monthly_chars":100000,"rate_limit_per_min":20,"max_api_keys":5,"price":29.0},"pro":{"monthly_chars":1000000,"rate_limit_per_min":60,"max_api_keys":10,"price":99.0},"enterprise":{"monthly_chars":10000000,"rate_limit_per_min":200,"max_api_keys":50,"price":499.0}}}