What is Meridian PSI?

What Meridian monitors

Meridian tracks seven independent behavioral signal dimensions during every live NinjaTrader 8 session. These signals update in real time — within 100ms of each execution — and combine into a composite Psychological Stability Index (PSI) scored 0–100.

• Revenge Entry — rapid re-entry at elevated size within a short interval after a loss event
• Overtrading Pace — entry frequency accelerating beyond your own historical baseline
• Stop-Loss Manipulation — widening or removing a protective stop on an active losing position
• Size Spike — position sizing approaching or repeatedly hitting the configured maximum under loss conditions
• Rule Violations — trading outside your declared session parameters (instrument, time window, trade count)
• Hold Bias / Position Overstay — holding duration diverging significantly from your norm, correlated with unrealized loss
• Drawdown Depth — cumulative session drawdown relative to your own historical session profile

Each dimension is calibrated to your own trading history — not a population average. Meridian compares your current behavior to your past behavior. A scalper who normally enters every 90 seconds is evaluated against their own baseline, not against a swing trader's pace.

What Meridian Guard enforces

Meridian Guard is the optional enforcement layer. You configure the rules when you are calm and deliberate. Guard executes them automatically when they are triggered — without asking you to make a judgment call at the moment your judgment is most impaired.

Guard supports six trigger types:

• PSI Below a defined threshold
• N Consecutive Losses in a session
• Session P&L Below a declared limit
• Unrealized P&L Below a threshold (before the position closes)
• Single Trade Loss exceeding a defined amount
• Session Time Over a planned duration

And five response levels:

• Alert — quiet notification, does not interrupt trading
• Acknowledge — requires typing a pre-written phrase before continuing
• Countdown — mandatory pause, cannot be skipped
• Risk Alert Mode — persistent banner requiring active confirmation before each new entry
• Disconnect — disconnects the broker connection entirely; open positions must be managed manually

Guard rules can be password-locked to prevent in-session override. This is intentional: a rule that can be easily bypassed at the moment it fires is a rule with no enforcing power.

Who Meridian PSI is for

Meridian is built for discretionary futures traders who trade on NinjaTrader 8 (Windows). It is particularly relevant for:

• Traders who have identified emotional or behavioral failure modes in their session history — revenge trading, overtrading, stop manipulation — and want a structural solution beyond journaling
• Prop firm traders who need behavioral guardrails on top of evaluation account limits, to protect funded accounts from single-session blow-ups
• Experienced traders who are technically sound but whose biggest losses consistently come from execution breakdown under stress, not from bad setups

Meridian is built for discretionary execution on NinjaTrader 8. It is purpose-built for behavior, not for direction or for fully automated strategies.

How Meridian differs from journals and P&L limits

A trading journal is retrospective: it records what happened after the session ends. A P&L limit is a hard floor: it stops trading after financial damage has already occurred. Both are useful. Neither can interrupt a decision that is being made in real time.

Meridian operates during the session — at the same moment and in the same environment as the behavioral failure it is designed to address. The PSI score updates with each fill. Guard rules fire when behavioral thresholds are crossed, before the financial consequence has compounded.

The journal tells you what you did wrong. The P&L limit stops trading after it has already cost you. Meridian acts in the window between the behavioral deterioration and the outcome — the only window in which it is possible to intervene.

Frequently asked questions

What is Meridian PSI built for?

Meridian is purpose-built for behavior. It monitors how you trade — entry timing, sizing, stop discipline, session pace — and surfaces the behavioral patterns that lead to costly sessions before they compound.

Is Meridian PSI compatible with prop firm evaluation accounts?

Yes. Meridian works with any NinjaTrader 8 connection, including Tradovate and Rithmic evaluation accounts. It runs as a local behavioral overlay on top of your session, fully independent of the prop firm's own infrastructure.

How does Guard handle open positions?

By design, Guard intervenes at the decision point — before the next entry. It can block new entries, require typed acknowledgment, enforce a mandatory countdown, or disconnect the broker connection. You remain in full control of any open position throughout.

Where is my trading data stored?

All data — fills, session history, behavioral metrics, PSI scores — is stored locally on your machine. The only outbound request is license validation on startup.

What is the difference between Meridian and Meridian Guard?

Meridian is the real-time PSI monitor: seven behavioral signals, personal adaptive baseline, session history, post-session reports. Meridian Guard is the automated enforcement layer — six trigger types, five response levels including broker disconnect — plus the Intel Layer analytics.