Why Post-Only Matters on Perp DEXs
Most perpetual DEX fee schedules charge more for taker volume than maker volume. On busy books, a limit that was meant to rest can cross the spread in a millisecond and become a taker fill. Post-only (sometimes labeled maker-only) rejects that path: the order posts only if it rests. If it would immediately match, the engine cancels or amends rather than taking liquidity.
That single constraint changes strategy design. You stop “accidentally scalping as a taker,” you stabilize fee drag, and you force clearer intent: either you are providing liquidity at a price, or you explicitly choose an aggressive order.
Post-Only Across Hyperliquid, Lighter, and Aster
Hyperliquid
Hyperliquid’s CLOB-style book rewards disciplined maker flow. Post-only is ideal for ladder entries, inventory-aware market making, and reduce-only scale-outs that should not cross. Pair it with referral code HOLYGRAIL when you onboard via Hyperliquid. Review fee structure in Hyperliquid taker/maker fees.
Lighter
Lighter’s competitive fee positioning makes maker discipline a large part of edge for high-turnover traders. Post-only entries during range conditions can keep costs near zero relative to market spam. Start with code 718610TD at Lighter and compare fee notes in Lighter perpetual fees.
Aster
On Aster, post-only helps when you want controlled passive fills around funding windows or breakout retests without paying cross-spread costs. Use code 4474ca via Aster and see Aster fee structure.
Core Maker Strategies Using Post-Only
- Passive pullback entries — place post-only bids below VWAP or prior micro-highs; cancel if structure breaks.
- Two-sided scalping — tight post-only quotes with hard inventory caps and reduce-only exits.
- Scale-out ladders — post-only + reduce-only offers above entry to harvest without flipping side.
- Funding harvest setups — enter passively before a predicted funding print, exit passively after.
- Bot grid legs — every grid level should be post-only so a spike does not convert the whole grid into takers.
When Post-Only Is the Wrong Tool
Do not use post-only when you must be filled now: stop-outs, news liquidation cascades, or invalidation breaches. In those moments, a reduce-only market or IOC is correct. Post-only is a cost and toxicity filter, not a survival tool. Mixing the two intents is a common reason traders “miss the exit.”
Also avoid resting post-only size you cannot cancel quickly during thin weekend books. Maker fills in illiquid hours can be adverse selection — you get filled right as informed flow arrives.
Execution Checklist
1) Decide maker vs taker before opening the ticket. 2) If maker, enable post-only. 3) If flattening, add reduce-only. 4) Set a cancel timer or structure-based cancel. 5) Log fee rate and slippage separately so you know whether edge is signal or cost control. 6) Compare venue maker quality using live depth, not marketing pages — our three-way DEX comparison is a starting map.
Fee Math Intuition
Suppose you trade $2M notional per day. A 1–2 bps swing between maker and taker compounds into meaningful monthly PnL even before alpha. Post-only does not create edge by itself, but it stops fee leakage from eroding a strategy that is only slightly positive expectancy. Combine with smart position sizing from position sizing.
Pick a Venue and Trade as a Maker
Hyperliquid HOLYGRAIL · Lighter 718610TD · Aster 4474ca — then default post-only on passive tickets.
Start on Hyperliquid