Built a brutally honest futures backtester. Looking for beta testers

My live bot lost its first 3 trades in 2 days. The backtest was filling orders on the signal bar. Classic. So I built Kapybar. Describe your strategy to Claude or ChatGPT (any language, voice, even a screenshot), confirm the rules, and it runs on 40 liquid CME futures (ES, NQ, CL, GC, ZN… + micros), 1-min to daily, back to 2008. \- next-bar fills, real rolls, commissions \- always vs buy-and-hold \- flags luck and edges that die with one more tick of cost \- last 2 years hidden until your final verdict (3 shots per market) \- prop-firm pass odds, minus luck It tests your ideas, it doesn't make them up. If something passes, it means something. Looking for serious rule-based traders. Needs Claude or ChatGPT Plus (MCP connector, 2 min setup). Free during beta. No money, no broker access, no API keys. Comment how you trade and I'll send an invite. Not financial advice.

11 comments held Reddit says 0 on reddit ↗

u/[deleted] 1 1 day ago

[removed] — already gone when the archive first saw it
u/QuanTradin 1 1 day ago

hiding the last 2 years with 3 shots per market is the best bit here. most people burn their holdout on the fourth tweak and never notice they did.
u/Quant_Nexus 1 1 day ago

Just going to lead to the classic "curve fit the OOS" problem though
u/QuanTradin 1 1 day ago

it can, but three shots puts a ceiling on how much fitting the holdout absorbs. once they're spent you're forward testing, which is where it should end up anyway.
u/kawash125 OP 1 1 day ago

The 3-shot cap is per market (ES and MES share it) and every dev variant makes the stats stricter. After that, it's forward testing
u/Free-Landscape-8987 1 1 day ago

that's the whole game isn't it. you tweak the stop, tweak the entry time, tweak the session filter, and suddenly you're looking at a curve that only exists because you stared at it too long. three shots forces you to actually think before you burn one i've been slowly building a mean reversion thing on CL and ZN but every time i think i've got something the walk-forward just laughs at me. the hidden holdout would probably kill it in two weeks flat which is exactly why i should run it
u/QuanTradin 1 1 day ago

CL is a rough market to start mean reversion on, it trends hard on inventory days and OPEC headlines. ZN reverts more politely. before touching the rule I'd check whether the walk-forward losses bunch on Wednesdays or news days, that tells you if it's the idea failing or the calendar.
u/kawash125 OP 1 1 day ago

CL and ZN are both in, and you can filter by weekday. Better the holdout kills it now than live :)
u/kawash125 OP 1 1 day ago

Thanks, that's exactly the failure mode it's built around. Most people dont realize the fourth tweak was the one that burned it
u/roztok_potok 1 1 day ago

So you wanna collect people strategies and use it for yourself. Smart idea but that's not gonna happen. All you can get is unprofitable ones.
u/kawash125 OP 1 1 day ago

My goal is building the tool, not mining strategies. You don't need to bring your real edge: test a dummy or just your exits. If that's not enough trust, totally fair to skip it