What it is
A browser-based BTC/ETH paper trading desk. Every 5 seconds it evaluates the market, draws buy/sell points and decision history. No exchange connection, no real orders, no funds; account and positions live in localStorage.
How it uses Jev
Each tick, the server fetches CoinGecko prices, builds a state, and asks Jev one request with three questions to classify the current market as buy/sell/hold per hardcoded criteria. The returned action, probability, and risk drive execution and bookkeeping.
Primitives:choicescore
Technique worth stealing
Abstract the signal source behind a provider interface so Jev variants, one-line mechanical rules, and random signals can be compared on the same samples.
Try it
export AI_GATEWAY_API_KEY=vck_xxx; node tools/compare-criteria.js --days 90 --samples 89 --step 24
Evidence
Each line is one question put to Jev about the README. ≥ 0.60 reads as yes, ≤ 0.40 as no; in between Jev is not making a call.
- Jev-centricyes0.94
- Shows a System One patternyes0.82
- Handles uncertaintyno0.08
- Measuredunclear0.58
- Runnableyes0.84
- Worth recommendingunclear0.54
- Model replicano0.03
- Problem scopescore on a 0–2 scale0.22
- About Jevyes0.98
Signals by Jev jev-1.13.0, card written by DeepSeek V4.1 Flash from the README on 20 Sept 2026.