Polymarket arbitrage can be profitable, but only under strict conditions:
- real probability mispricing exists
- execution is fast enough to capture the spread
- liquidity supports entry and exit
- competition has not already neutralized the edge
profitability is not constant — it is conditional and execution-dependent
Where Profit Comes From
Arbitrage profit originates from:
- mispriced probabilities across markets
- delayed reaction to new information
- temporary liquidity imbalances
profit exists when probability representation is temporarily incorrect
Why It Looks Easy (But Isn’t)
On the surface:
- buy low
- sell high
- repeat
But in prediction markets:
price = probability estimate of real-world outcomes
So the real question becomes:
is the probability mispriced, and can it be captured before correction?
Who Actually Makes Profit
Successful traders
- model probability, not price
- wait for structural inefficiencies
- manage liquidity constraints
- exit positions with discipline
Unsuccessful traders
- chase visible price gaps
- ignore slippage and fees
- overtrade low-quality setups
- misread temporary noise
Hidden Cost Layer
Even correct trades are constrained by execution reality:
- fees reduce net edge
- slippage distorts entry/exit
- liquidity limits position size
- time delay locks capital until resolution
Example Trade
- market price: 0.45
- estimated probability: 0.65
- position: YES
If repricing occurs:
- new price: 0.62
- profit captured via convergence movement
Why Most Traders Fail
Failure is not due to lack of opportunities.
It is due to:
- overestimating frequency of mispricing
- entering low-liquidity environments
- reacting instead of modeling
- ignoring execution constraints
System Reality
Arbitrage profitability is not static.
It is a function of:
- probability accuracy
- execution speed
- liquidity depth
- competitive saturation
edge exists only when these variables temporarily align
Intraday → Arbitrage → MEV Spine
Where real-time information becomes probability movement and liquidity pressure.
Execution Systems LayerHow arbitrage is executed under latency, fragmentation, and intraday conditions.
MEV Execution LayerWhere ordering competition and execution priority determine final profit capture.
Upstream Context Links
Breakdown of probability mispricing and convergence-based profit mechanics.
Arbitrage Loop StructureWhy inefficiencies persist as oscillating system behavior instead of one-off gaps.
Final Verdict
Polymarket arbitrage is profitable only under controlled execution conditions.
The limiting factor is not opportunity detection.
It is execution consistency under competitive and liquidity constraints.