Momentum strength filter

Marks bars where at least two of three rate-of-change readings are up past a threshold and RSI is in an up-trend band.

It reads three rate-of-change values, each a fractional return over its own look-back (0.005 means +0.5%), and counts how many exceed min_threshold; at least two must. It also needs the RSI input between 0.4 and 0.7 on the -1 to +1 scale, a strong up-balance that stops short of the extreme. It returns True only when both hold, False otherwise, and nothing until all four inputs have values.

How to read it

Markers sit only on bars where the condition is True; a bar with no marker is not a bearish signal.
A marker means momentum is up across most windows and RSI is strong but not extreme.
When RSI runs above 0.7 during the steepest rallies, markers drop out even though price is rising.

What it outputs

Bullish momentum: True on bars where at least two of three rate-of-change readings exceed the threshold and RSI is between 0.4 and 0.7.

When it fires

Momentum is up on at least two of the three windows by more than min_threshold, and RSI is between 0.4 and 0.7. It means the up-move is consistent across timeframes without being overbought. On the SPY sample it fired on about 11% of bars, about 36 times a day.

Settings

min_threshold: The minimum fractional move each rate-of-change reading must clear to count as up (0.005 is 0.5%). Raising it thins markers to sustained rallies; lowering it toward 0 marks any up move, and below 0 also counts small down moves, so markers fire more often.

Pitfalls

It looks only for up-moves. It never marks falling momentum and has no bearish mirror.
It is frequent at default settings, so a single marker is weak evidence on its own.
The name says filter, but it does not gate another signal. The 0.4 to 0.7 RSI band is hard-coded, and min_threshold leaves it unchanged.