Why You Can’t Replicate Polymarket Arbitrage: Math vs Execution Reality

THE CORE MISUNDERSTANDING

Most interpretations of Polymarket arbitrage reduce it to a pricing mismatch problem.

That is the first error.

The real system is not “finding price differences.”

It is surviving execution constraints long enough to realize them.

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1. THE MATH IS EASY — THAT’S THE TRAP

On paper:

• Market A: Yes = 0.42
• Market B: Yes = 0.46
• Spread: 0.04

Retail interpretation:
→ “Buy low, sell high, risk-free profit”

Reality:
→ You are competing against latency-optimized systems that collapse that spread before your transaction confirms.

Math is not the bottleneck.
Execution is.

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2. EXECUTION LAYER IS THE REAL MARKET

Arbitrage does not occur in charts.

It occurs in:

• RPC propagation time
• Mempool visibility windows
• Order book micro-updates
• Settlement finality lag

By the time a human sees a spread:

→ it is already partially or fully compressed

You are not trading price.
You are trading time awareness vs infrastructure proximity.

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3. LATENCY KILLS THE STRATEGY

Typical retail stack:

• Browser / manual execution
• Standard RPC endpoints
• No mempool optimization

Professional stack:

• Dedicated low-latency RPC routing
• Parallelized order submission
• Pre-signed conditional execution
• Event-driven bots reacting sub-second

Difference:

You react.
They anticipate.

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4. LIQUIDITY IS NOT SYMMETRIC

Even when a spread exists:

• Depth may be thin on one side
• Slippage absorbs theoretical profit
• Partial fills distort expected value

Result:

Expected arbitrage → negative realized return

This is where most “backtests” fail.

They ignore fill probability distribution.

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5. FEES AND MICROSTRUCTURE BLEED EDGE

Every layer extracts value:

• Trading fees
• Gas volatility
• Bridge delays (if cross-system)
• Failed execution retries

A 2–4% “clean spread” often collapses into:

→ ~0.2–0.8% net after full stack costs

And that assumes perfect fills.

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6. COMPETITION IS NOT HUMAN

You are not competing with traders.

You are competing with:

• Market-making bots
• Cross-exchange arbitrage systems
• Internalized liquidity routers
• Event-driven prediction engines

These systems:

• Do not sleep
• Do not click
• Do not interpret charts

They execute probabilistic state updates.

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7. THE REAL EDGE (WHAT ACTUALLY WORKS)

Arbitrage survival requires:

• Co-located or near-co-located execution paths
• Event-driven ingestion (not polling)
• Pre-validated transaction pipelines
• Risk-adjusted execution thresholds (not static spreads)

Without this:

→ you are reacting to artifacts, not inefficiencies

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CONCLUSION

Polymarket arbitrage is not a “strategy you replicate.”

It is a systems problem disguised as a trading opportunity.

If you remove infrastructure, latency, and execution constraints:

→ the edge disappears

What remains is only noise.