OKX WebSocket Orders Channel Push Behavior Adjustment Announcement

Published on Jul 16, 20262 min read

To help clients more clearly determine the final status of "post-only" new orders (including "mmp_and_post_only") and upcoming "rpi" new orders — and to avoid scenarios where an order is still canceled after the client has already received a "state: live" event — OKX plans to adjust the "state: live" event behavior for "post-only" and "rpi" orders in the order channel.

Impact details

Timing adjustment for the "state: live" event push: instead of being pushed immediately upon order receipt, it will now be pushed only after the order has successfully entered the order book (a delay of approximately 1 ms).

In failed order placement scenarios (price crosses the BBO and is canceled), the "state: live" update will be removed entirely — only a "state: canceled" update will be pushed.

Scenario	Before	After
"post-only" order placement failure (price crosses the BBO and is canceled)	"state: live" → "state: canceled"	Only "state: canceled" (no "state: live")
"post-only" order placed successfully	"state: live" pushed immediately	"state: live" (delayed ~1 ms)
"post-only" order placed successfully, then filled by one taker order	"state: live" → "state: filled"	"state: live" (delayed ~1 ms) → "state: filled"
"post-only" order placed successfully, then filled by multiple partial fills	"state: live" → "state: partially_filled" → "state: filled"	"state: live" (delayed ~1 ms) → "state: partially_filled" → "state: filled"
"post-only" order with "reduceOnly: true", size modified	"state: live" → "state: live" ("amendSource: 4, amendResult: 0")	"state: live" ("amendSource: 4, amendResult: 0") → "state: live"
For the upcoming "rpi" order, "rpiPxRound: false", order placement failure (canceled due to not meeting the price spacing rule)	N/A	Only "state: canceled" (no "state: live")
For the upcoming "rpi" order, "rpiPxRound: true", and price is modified	N/A	"state: live" ("amendSource: 6, amendResult: 0") → "state: live"

Effective date

For "rpi" orders: Demo Trading — 21 July; Live Trading — 28 July.

For "post_only" and "mmp_and_post_only" orders: both Demo Trading and Live Trading — mid-August.

Scope of impact

The order types affected are: "post_only", "mmp_and_post_only", and "rpi" (Retail Price Improvement).

Other order types — such as "limit" (regular limit orders), "market" (market orders), "ioc", and "fok" — will have their push behavior remain unchanged.

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