GET /v1/market/symbols is the list of pairs you can trade. Start here before placing an order.GET /v1/deposit/assets (section 10) is the list of coins you can hold. It is a different list, and it is not what you want for trading.1m 3m 5m 15m 30m 1h 2h 4h 6h 8h 12h 1d 3d 1w 1M. Spot accepts all of those plus 1s and 5s.