All contract exchanges offer conditional orders, such as buying or selling at a price greater than a certain trigger price.
I feel this is necessary when I'm trading contracts, and it's always safer to implement it with my own code than to do it on an exchange.
After all, your own robot may have lag or unstable downtime, and if the market is not good enough (extreme trading in digital currency is still quite frequent), you can only lose by accepting it.
If a stop-loss order has been placed in advance on an exchange without a settlement, the exchange can also be consulted.
The grassThe three tutorials at the top of the homepage can be seen.
The grassIt can be implemented with IO, this type of interface is not wrapped, so there is no uniformity https://www.fmz.com/bbs-topic/4183#io%E5%87%BD%E6%95%B0%E8%AE%BF%E9%97%AE%E5%8A%A0%E5%AF%86%E6%8E%A5%E5%8F%A3