Paper trading, not investment advice. Every account and book on these pages trades paper money: the Alpaca paper accounts DAILY ($1,000,000 from Sep 30, 2026), INTRA1 ($100,000 from Sep 30, 2026) and INTRA2 ($100,000 from Sep 30, 2026); the simulated books SIM-TT ($100,000 from Sep 29, 2026), SIM-V2B ($100,000 from Sep 28, 2026) and SIM-V2B-TOM ($100,000 from Sep 28, 2026), filled at the official close; and market-analysis's ledgers, one contract per position against a $100,000 reporting equity. No real money is at stake. Positions, trades and P&L are published the same day, as the engines record them, with each number's source and cost model labelled. Nothing here is a recommendation to buy, sell or hold any security, and nothing is tailored to you. Each strategy is a pre-registered experiment, read once on a date or at a trade count fixed in advance; until then its record says little either way. I may hold or have held positions in securities shown here. Markets can and do lose money.

Trade

SPY · Noise area

Opened Oct 27, 2026, in INTRA2.

The trade

Account: INTRA2
Strategy: Noise area
Book: noise
Symbol: SPY
Asset class: equity
Side: long
Exposure: long
Status: rule only
Opened: Oct 27, 2026
Closed: —
Quantity: 0
Entry price: —
Exit price: —
Exit by: —
Book value at entry: $47,224.97

Record Trade journal

Cost model

Alpaca paper fills, with no commission; Alpaca's SEC and CAT fees, charged by the day, are left out. Commission is estimated at $0.007 a share a side, the rate at the owner's own broker: the net P&L is the P&L less it; the P&L, the return, the P&L in basis points of the book and the R multiple are before it. The rule book's day return is the rule's own replay on SIP bars, after the research's own costs: $0.0035 a share a side in commission for the noise area and $0.007 for the other rules, and a cent a share of slippage on every fill except a resting limit order's and the noise area's exit at the close.

The rule's own trade

The rule replayed on its own bars, beside the account's fills.

Matched the account: no
Entry: 770.65 at 12:00 ET
Exit: 769.40 at 13:00 ET
Exit by: —
The rule's day: −0.0%
The rule's trades that day: 3

side: 1
symbol: SPY
exit_min: 780
entry_min: 720

Notes

the noise-area rule on SPY and QQQ: checks on the half hour 10:00-15:30, out at the close

inputs

open.at: 10:00:04
leverage: 3.048452103312512
open.note: SPY: open 767.34, previous close 765.37, leverage 3.05, 93 shares a leg
open.open: 767.34
open.event: open
prev_close: 765.37
open.shares: 93
open.symbol: SPY
sigma_10:00: 0.0011512979929342224
open.leverage: 3.048452103312512
open.prev_close: 765.37