Observed arrival · 2026-10-18
Nothing But Alpha’s backtest leak detector
A tool suite that checks trading backtest code for bias and keeps tamper-evident records of published stock calls.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Quantitative traders and public stock-call publishers
- Worth noticing
- Its held-out test caught 30 of 60 planted leaks; the page says the test set was written for the project and sealed before scoring.
Field notes
The auditor’s example traces a suspicious signal to `shift(-1)`, which moves tomorrow’s closing price onto today’s row; the displayed correction is explicitly described as hand-made. The call ledger shows chained SHA-256 fingerprints, a seal date, and a link to ledger-heads on GitHub. The site also notes that its tests use one project-written, sealed set and that the auditor misses many planted issues.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
$PaidCommerce or pricing visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
ƒJavaScriptBrowser-side code central
One card from the complete issue