Praxis — audited systematic strategies, in your trading stack

Abstract

Praxis is a library of audited systematic trading strategies. Published claims overstate themselves, routinely and measurably [2, 3]. We read ≈480 new papers a month, 42,984 strategy papers mapped to date, and rebuild the most consequential to the paper's own spec. Each is re-run on bias-free data, out of sample, net of all real costs, across crisis regimes, accounting for overfitting [4] and luck [1]. Every claim leaves validated, overstated, or fails, and its code integrates into IBKR, Bloomberg or LEAN.

Keywords: replication · out-of-sample · deflated Sharpe · alpha decay · MCP

0 · Abstract§0 1 · Findings§1 2 · Methodology§2 3 · Access§3 4 · References§4

Figure 1. The corpus by economic bet and asset class: the ten most-published of 74 bets, title-tagged across 43,018 papers, multi-label. Shading ∝ papers. A · marks fewer than three.

1Findings

**Table 1.** Claimed vs. measured, out-of-sample, net of costs.
#	Paper	Asset	Claimed	Measured	Claimed → Measured	Verdict

(1)

2Methodology

Definition 1 (Measured edge). The measured edge is the paper's own headline statistic, recomputed from a full re-implementation under three conditions: (i) out of sample, (ii) net of real costs, (iii) on survivorship-clean, point-in-time data. Table 1 reports it beside the claim.

Theorem 1 (Selection). Among N backtests of noise, the expected best Sharpe ratio grows as √(2 ln N) [1]. Publication reports the maximum, so a claimed edge exceeds the true one in expectation. The excess is identified only by re-measurement under Definition 1, and Eq. (1) turns the gap into the verdict.

Remark. The verdict is computed, not argued.

Figure 2. What survives each gate. 100 claims enter, ≈12 leave beta-adjusted. Illustrative until the audited set is large enough to publish measured rates · full gate definitions ↗

3Access

**Table 2.** Access — reader is free, no card; desk seats open with the beta.
	Reader — free	Desk — beta
A library of clustered systematic trading strategies	10 papers	42,984
Strategy validation reports under live trading conditions	10	all
Reproduction code, integrated with Bloomberg, IBKR, etc.	10	all
Integration with your AI agent — Claude, ChatGPT, Cursor	10	full corpus

$ subscribe --tier reader

$ praxis --chat

works in Claude · ChatGPT · Cursor · any MCP host

4References

[1]Bailey, D. & López de Prado, M. The Deflated Sharpe Ratio. J. Portfolio Management, 2014.

[2]Ioannidis, J. Why Most Published Research Findings Are False. PLoS Medicine, 2005.

[3]Harvey, C., Liu, Y. & Zhu, H. …and the Cross-Section of Expected Returns. Review of Financial Studies, 2016.

[4]Bailey, Borwein, López de Prado & Zhu. The Probability of Backtest Overfitting. J. Computational Finance, 2017.