Testnet upgrade: ALO_SLIDE and ALO_JOIN are available We’ve added two post-only limit-order modes for testing: > ALO_SLIDE - If your limit would cross the opposite best price, it adjusts to the closest non-crossing price on the market’s tick grid. > ALO_JOIN - If your limit would cross, a buy joins the best bid and a sell joins the best ask. If that same-side quote is absent, it falls back to SLIDE. For example, with 99.00 bid / 101.00 ask and a 0.01 tick, a buy submitted at 105.00 would work at 100.99 with SLIDE or 99.00 with JOIN, subject to normal validation. Non-crossing orders keep their submitted price. The adjustment happens once on entry - resting orders do not continuously follow the BBO. Both remain post-only; ordinary balance, size and risk checks still apply. Integration and signing - Send "tif":"ALO_SLIDE" or "tif":"ALO_JOIN" in your limit action. - Use Testnet signing domain 2. - Set the TIF and submitted limit price before signing. Sign the original request, not the server-adjusted working price. - Custom binary signers: transaction TIF values are 3 for SLIDE and 4 for JOIN, encoded as little-endian u32. - Update closed TIF enums in your request encoder and /exchangeInfo decoder. - Order/account updates use postOnlySlide and postOnlyJoin. Testnet state was refreshed, so recheck your account, funding and open-order state. If you have any feedback - open a ticket on discord!