FAQ · Reamer Research and Reamer Server: what they are and who they fit

What results and metrics does a run produce?

A Reamer Research run produces 31 summary metrics, every closed trade, every fill and every order with its outcome, as one schema-versioned JSON document. From Python the binding returns less, the main profit and cost totals and the closed trades, so the full set comes through the C interface.

A Reamer Research run produces 31 summary metrics, every closed trade, every fill and every order with its outcome, as one schema-versioned JSON document. From Python the binding returns less, the main profit and cost totals and the closed trades, so the full set comes through the C interface.

The 31 summary metrics

  • Profit and cost: gross and net profit, with fees, slippage and overnight swap each reported separately.
  • Returns and ratios: total return, win rate, profit factor, expected profit per trade, recovery factor, and the Sharpe, Sortino and Calmar ratios.
  • Orders: how many were placed, filled, expired, cancelled and rejected. Each modification a strategy applies is recorded in the order log as its own Modified entry.
  • Trades: longest winning and losing streaks, and the average, longest and shortest holding times.
  • Drawdown: the largest fall in equity, in money and as a fraction.

The records behind them

  • Closed trades, each with entry and exit time and price, size, costs, profit and the stop and target it carried.
  • Fills, one per execution.
  • Orders, every one the strategy placed, with its type, lifetime, outcome, fill price and, if rejected, the reason. Orders still open at the end are listed separately.
  • Futures rolls, if you set them up.

The JSON report

The whole result is one JSON file, with a schema document in the kit. It carries a schema version, and within a version fields are only ever added, so your parsing code keeps working on newer releases. The same inputs and seed give the same bytes, so two reports can be compared with a plain file diff.

Limits worth knowing

  • Equity per closed trade, not per bar. The report carries the realised equity curve after each closed trade, with timestamps, and the ratios are computed from per-trade returns. Build a daily curve yourself from the trade records if you need one.
  • Annualisation is yours to set. Pass the number of periods per year and the Sharpe and Sortino ratios use it. Leave it unset and it is inferred from the typical gap between trade exits, which may not match your convention for a strategy that trades irregularly.
  • The Python binding returns the main totals and the closed trades, up to 65,536 by default. For the full report, call the C interface.

See How do I know if my backtest is overfit? and What is Reamer Research?

Next questions

Can I paper trade before going live?Yes, by pointing your Reamer Server connector at your broker's paper or demo account. The server handles paper and live orders the same way, and the licence allows both. The kit's in-memory paper broker only checks that your server is wired up correctly; it fills every order instantly at a made-up price, so it is not a market simulation.What does it take to move from Reamer Research to Reamer Server?Your trading logic and your order structure carry over. The relay functions in the Reamer Research library send the same orders your strategy returns in a backtest to a running Reamer Server and reads the fills back. Around it, you build a pre-trade gate and a broker connector once per deployment, feed live bars, and keep indicators as running state. Cost settings stay in research: live costs are what your broker charges.How fast is it?On a 64-core AMD EPYC 9575F, Reamer Research replays about 1.7 million bars a second in one backtest, and Reamer Server takes an order from a strategy to an accepted event in a median of 11.3 µs, with about 200,000 to 220,000 orders a second across many strategies. Each figure comes with the conditions it was measured under, and both kits include a benchmark to run on your own hardware.How long does integration take?In uncut recordings, Claude Code working only from the kit documents integrated Reamer Research in about 13 minutes and Reamer Server in about 19, through to a simulated fill for Reamer Server. The Reamer Server kit puts a person's first simulated trade at a few hours. Going live at a real broker takes longer, because the broker's protocol details, session recovery and certification are your work.

Every answer here restates the documents that ship in the kit, which are authoritative. All questions.

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