FWIW a decent part of this is, when designing the FTX API, we made a different decision than many: we decided to synchronize all marketdata so that we report trades, fills, orderbooks, etc. simultaneously.
This means that you can listen to any of them and have up to date info
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For now you can see FTX and Bitstamp on the GitHub which have no signs of executions in middle of spread, indicating all trades can be linked to orderbook activity.
More to come, stay tuned.
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