What JEV is
JEV is TypeSafe AI’s System One model. Given context and predefined questions, it returns typed, machine-readable results — choices, scores and their probabilities. TypeSafe describes its training approach as RLCD (Reinforcement Learning for Calibrated Decisions), with an emphasis on decisions and expressing uncertainty. Source 1
Unlike a general-purpose model that writes long reports, JEV returns a bounded decision: it picks among options we define and gives a probability for each. That makes results consistent to display and easier to evaluate after the fact.
What we send to JEV
Each time you press “Run analysis”, the Coinpred server builds a structured market context from:
- 200 historical candles with volume (Binance spot, at your chosen interval: 1m, 5m, 15m, 1h, 4h or 1d).
- 12 technical indicators, computed in code rather than by the model:
- Trend: EMA20, EMA50, SMA200, ADX
- Momentum: RSI(14), MACD(12, 26, 9), Stochastic(14, 3), CCI(20), Williams %R(14)
- Volatility: ATR(14), Bollinger Bands(20, 2)
- Volume: OBV
- Live order book depth (top 15 bid and ask levels from WEEX).
- Recent trade flow (latest WEEX trades, to gauge aggressive buying and selling).
This is a deliberate design choice: code computes, the model judges. TypeSafe documents known limitations such as numerical precision and complex indirection, so every indicator is calculated before it reaches the model. Source 3
How the five directions are defined
The direction question has exactly five options, each with explicit criteria:
| Direction | Criteria (summary) |
|---|---|
| Strong bullish | Strong bullish alignment across trend, momentum, order book and trade flow |
| Bullish | Moderately bullish evidence with some mixed or incomplete confirmation |
| Neutral | Mixed, weak or conflicting evidence; no reliable directional edge |
| Bearish | Moderately bearish evidence with some mixed or incomplete confirmation |
| Strong bearish | Strong bearish alignment across trend, momentum, order book and trade flow |
“Neutral” is a legitimate answer — when evidence conflicts the model is allowed, and expected, to say so.
Where confidence comes from
According to TypeSafe’s documentation, Choice and Score return a probability distribution over options, from which a 0–1 confidence is derived: concentrated distributions indicate clearer decisions, spread-out ones indicate more uncertainty. Source 2
Keep in mind:
- The public documentation does not disclose the exact formula, so we do not present “top probability” or “entropy” as the official method.
- Coinpred shows the direction answer’s
confidence × 100%, or “—” when none is returned. - Direction confidence, the confidence of a separate score question, and the largest directional probability are different quantities, and we keep them apart.
Confidence is not a win rate
The single most important point: direction confidence measures how certain this classification is. It is not the probability of winning an event contract. An 80% reading does not mean such trades have won 80% of the time.
Why:
- Inputs are spot data, and the candle interval is a data resolution — not a contract expiry.
- The request is not tied to any contract’s strike, settlement rule or payout.
- Establishing a win rate would require fixed prediction times, expiry and settlement rules, out-of-sample testing against baselines, calibration curves and Brier scores, with costs and payouts included. No such validation results are published on this site yet.
Where the evidence and guidance come from
JEV does not write free-form reports. The “evidence” section is assembled by our code from the inputs, and the “observation guidance” is an option the model selects from a predefined list (e.g. wait for confirmation, watch the pullback, protect the downside, watch resistance, stay neutral) mapped to fixed copy. Neither represents the model’s internal reasoning.
How to use it well
- Treat JEV’s answer as a structured second opinion, not a trading signal.
- Look at the shape of the distribution: concentrated means the evidence agrees; spread out means the market itself is unclear.
- Combine it with your own expiry, payout and position sizing.
Next: follow the step-by-step tutorial or open JEV Model Forecast. New to the product itself? Start with What are BTC event contracts?
Sources (reviewed 2026-09-23): [1] TypeSafe · Introducing Jev · [2] TypeSafe · Confidence · [3] TypeSafe · Known limitations (JEV 1.13)