Most short-horizon crypto Up/Down markets on Polymarket trade near 50¢ because direction over the next 5 minutes is almost random.
The abrownfox001 system (wallet 0x12b712029efeee7efc4066e98e4e1b6beb8b1b0b) treats this differently.
It runs a pure BTC 5-minute directional bot that:
- Generates a calibrated micro-horizon forecast
- Enters in the fair 45–55¢ zone
- Actively scratches low-conviction positions at near-breakeven
- Holds only high-conviction legs to resolution
Public samples show a ~60.7% win rate on resolved positions and strong ROI on capital that actually reaches settlement.
This is a completely different archetype from 94–99¢ convergence farming.
Strategy Overview
| Dimension | Behavior |
|---|---|
| Asset | BTC (≈99% of activity) |
| Window | 5-minute Up/Down |
| Entry zone | ~45–55¢ (≈90% of fills) |
| Style | Directional + conviction cull |
| Exit | Scratch weak tickets / Redeem winners |
The core insight is simple:
A market everyone treats as 50/50 becomes positive expectancy when you can consistently push the held book above 60% accuracy while paying almost no cost to exit the weak ones.
Three Layers That Make It Work
1. Calibrated Directional Signal (Private)
The edge lives here.
A sustained ~60% read on 5-minute BTC requires more than raw CEX lead. It needs a properly calibrated model that accounts for lead-lag, flow, short-term momentum, mean-reversion, and time remaining in the slot.
2. Fair-Value Entry at Size
Entries are spread across the slot (median ~47 seconds after open) so the bot can accumulate $50–$175 clips near 50¢ without lifting a thin early book.
3. Conviction Culling (The Execution Moat)
This is the under-appreciated part.
In large public samples, roughly one-third of markets show both a buy and a sell at almost identical prices. These are scratch exits when the signal decays. Only the strong reads ride all the way to $1 or $0.
This filtering is why the resolved win rate can exceed the raw signal accuracy at essentially zero cost.
Economics at 50¢
When you enter near p = 0.50 and achieve win rate w:
EV ≈ 0.50 × (2w − 1)
At w = 0.607 the naïve EV is already +10.7% of stake per resolved trade.
The observed sample ROI is higher because winners are often accumulated slightly below 0.50 and losers are scratched before they go to zero.
System Pipeline (High Level)
- Signal → private P(Up) for the current 5m window
- Edge check → |P − 0.5| ≥ threshold and ask is attractive
- Accumulate → taker buys in the 45–55¢ band
- Re-score every 10–30 seconds
- Scratch if conviction decays, otherwise hold
- Redeem winners at resolution
Practical Takeaways for Builders
- The hardest (and most valuable) piece is the calibrated signal. Everything else is infrastructure.
- Active risk management via scratches is often more important than pure win rate.
- Trading the mid-band at 50¢ is far less fee-sensitive than late-game convergence.
- Latency, fill quality, and capital efficiency still matter — especially when competing for the same 50¢ liquidity.
This system is deliberately specialized: BTC only, 5-minute only, mid-band directional only. That focus is a feature, not a limitation.
The public README serves as proof of authorship and a transparent strategy overview rather than a full code release — which is the correct approach when the real alpha lives in the signal and its calibration.
If you’re exploring directional approaches on Polymarket instead of pure volume farming, this archetype is worth studying closely.
If you have more questions, please feel free to contact me at any time: https://t.me/abrownfox001
My Polymarket Activity: https://polymarket.com/@abrownfox001?tab=activity
Polymarket #BTC #TradingBot #DirectionalTrading #PredictionMarkets #CryptoBot #AlgorithmicTrading #DeFi
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