Except of a few mentioned above, rest are in complete violation of SEBI guidelines, and you not putting a disclaimer mentioning that, which is quite irresponsible. Eg: tradetron is allowing people to sell strategies and autotrade, both of which violation of SEBI guidelines under various circulars. Another example would be kuants or anyone offering paid market place or autotrade situation. Also most of these ask clients to put their broker API keys which are meant for personal use in a commercial service, which is violation of brokers terms of service and exposes clients to huge security risks. Please be more responsible in your writing, especially when novice don't know the guidelines and although you have done a ton of research, you have not gone done enough. Only few you have listed truly follow the the compliance and have actually partnered with brokers to provide their service, rather than just adding support via public APIs meant of personal use only.