TradingCalc
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Notes from building TradingCalc

Real trading problems, what I build to fix them for myself, and how the deterministic math holds up. Not a press release feed.

2026-11-02Models know how to solve it. We cannot check their number

Research report: six AI models, 105 trading-maths questions, with and without a deterministic calculator layer. A small model lost a winning short at confidence 99. Method, results, limits and the raw data.

2026-10-25Two checkers said yes. The proof was false.

A Lean proof that passed two independent checkers, physics tests where most of the wrong answers were the test’s fault, and what I found when I recomputed the answer key of my own benchmark.

2026-10-02The average entry price on a coin-margined contract is not the average

Two buys at 2000 and 4000 average to 2666.67, not 3000, and a coin-settled call has a capped profit. Where both come from, and how to check them.

2026-10-01How pump.fun’s bonding curve prices a buy

The constant-product math behind a pump.fun launch, with exact numbers, and a snippet to check any buy yourself.

2026-09-19Add a risk gate to your Binance Agent OS or Coinbase agent

I’m a short trader who’s twice guessed my own liquidation price instead of calculating it. Here’s the one-call fix I built for myself, and how it grew into 32 tools.