Thin Wide Book — Signal Playbook

What it detects

Liquidity is thin and the spread is wide at the same time — a fragile book where small orders move price a lot. This is a risk/context flag, not a direction.

How Thin Wide Book paints across a heatmap row — the colour language it speaks on the live map.

How to play it

Use it as scanner context, not an automatic entry:

• Read it as “handle with care”: moves here are cheap to cause and easy to fake.
• Expect larger, faster swings — size down and widen stops accordingly.
• Treat directional signals on a thin-wide book with extra skepticism.
• It often precedes volatility expansion — useful as an early heads-up.

Confirmation

What strengthens the read:

• Realized range expands shortly after.
• Spread stays wide (the fragility persists).
• Low resting notional confirmed across nearby levels.

Invalidation

What kills it:

• Liquidity refills and the spread tightens — fragility resolved.
• It’s a structurally illiquid small-cap (chronic, not an event).

Risk & honest evidence

Respect the limits:

• Execution quality is poor — slippage is the main enemy here.
• Thin books are where spoofing and stop-runs are most effective.
• Evidence: grounded in market-microstructure research; where thin liquidity is shown to precede larger price impact (Kyle-style). vyx's own live backtest is still accruing — treat this as scanner context, not a proven edge.