Justin's Playground

1. Trade price
2. Trade volume
3. Exact sequencing of trades

2. Level 1 CME feed (Top-of-Book)
Typical characteristics:

1. Aggregated trade prints
2. Possible volume compression during high activity
3. Fewer updates under heavy load
4. No depth context

Result:

1. VWAP is an approximation
2. Small inaccuracies accumulate intraday
3. Deviations increase during volatility (open, news, spikes)

3. Level 2 CME feed (Market Depth / MBP)
Typical characteristics:

1. Tick-by-tick trade reporting
2. Accurate volume attribution
3. Proper sequencing of executions
4. Full depth context (even if VWAP itself doesn’t “need” depth)

Result:

1. More accurate VWAP
2. Matches exchange-calculated VWAP much more closely

How big is the difference?
VWAP TypeDifference
Session VWAPUsually very small (often < 1 tick)
Anchored VWAPCan differ noticeably
Rolling / intraday VWAPCan diverge meaningfully
VWAP bands (σ)Differences amplified
For CME futures like GC, ES, NQ, this matters if VWAP is a precise execution level, not just a bias tool.
Important CME nuance
CME provides:

1. Top-of-Book → Level 1
2. Market-By-Price (MBP) → Level 2
3. Market-By-Order (MBO) → institutional

Most retail “Level 1” feeds filter or aggregate trades, which directly affects VWAP precision.
Bottom line

1. VWAP from Level 1 ≠ VWAP from Level 2
2. Level 1 VWAP = usable approximation
3. Level 2 VWAP = execution-grade accuracy
4. The faster your trading and the shorter your anchor, the more Level 2 matters

If you want, tell me your broker + platform (Quantower, MotiveWave, etc.) and instrument, and I’ll tell you whether your VWAP is trustworthy or not in that exact setup.