Does anyone have any recommendation for the best broker to use for systematically trading futures (stock, interest rate, fx), ETFs on Europe, North America, Tokyo, Hong Kong, Singapore exchanges?
Criteria:
1. Costs (minimum account, transaction costs, monthly fees)
2. API - preferably python
3. Ease of use and efficiency of service.
4. Has a paper trading account
5. Market data availability
This would be for an individual UK based investor trading on medium frequency: e.g. run models 3 times a day and keep a minute-by-minute track of risk.