[Intro paragraph]
In May 2026 I launched @dual-leg on Polymarket. In just weeks it has racked up 222 predictions and delivered +$2,506.86 in realized profit in the last 24 hours alone. Positions are currently at $0.00 — everything is closed and banked.
This isn’t a directional prediction bot. It’s a pure dual-leg arbitrage engine that exploits tiny, mathematically guaranteed inefficiencies in Polymarket’s binary Up/Down markets.
The Math Behind Dual-Leg Arbitrage
Every Polymarket binary contract (e.g. “Bitcoin 15-Minute Up or Down”) has two outcomes:
- YES (Up) share
- NO (Down) share
At resolution the correct share always pays exactly $1.00. Therefore:
Up price + Down price must equal $1.00 at settlement.
When the sum of the best available ask prices dips below $1.00, you can buy one share of each and lock in risk-free profit:
Example:
- Best ask Up = $0.48
- Best ask Down = $0.49 → Total cost = $0.97 → Guaranteed payout = $1.00 → 3.09% locked profit (minus tiny fees/slippage)
The edge is small per trade, but the frequency is massive.
How the Bot Works (Technical Deep Dive)
Market Scanner
Continuously monitors every active short-term crypto binary market via Polymarket’s public API and WebSocket order books.Mispricing Detector
Real-time calculation:
if (best_ask_Up + best_ask_Down) < THRESHOLD (e.g. 0.985)→ trigger.-
Atomic Dual-Leg Execution
The critical part. The bot places both buy orders in the same micro-batch with strict timing (≤50 ms window).- If one leg fails → auto-cancel or hedge the other instantly.
- Retry logic on transient failures.
- Liquidity & volume filters prevent getting stuck in thin markets.
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Position Management
- Hold to resolution for full edge, OR
- Exit early when prices converge (faster capital turnover).
- Dynamic position sizing based on available edge and current portfolio risk.
-
Risk Controls
- Never naked (always both legs).
- Max exposure per market.
- Automatic shutdown on extreme volatility or API issues.
Result? Near-zero directional risk and compounding small edges 24/7.
Real Performance (as of May 6, 2026)
- Account: @dual-leg (joined May 2026)
- Predictions: 222
- 24-hour realized PNL: +$2,506.86
- Current positions value: $0.00 (fully realized)
- Track record: https://polymarket.com/@dual-leg
This is the same class of strategy that has been documented turning tiny starting capital into six figures in weeks — but @dual-leg is battle-tested and running live right now.
Why I’m Selling the Account
The bot has proven the strategy works at scale. I’m now liquidating the full account + complete automation setup to free up capital for the next phase of development.
Serious buyers only — full handover, documentation, and live monitoring included.
Want it? DM me on Telegram (@xxninex) or reply to the thread.
Link to live profile: https://polymarket.com/@dual-leg
Who’s next to run the money printer?
