The ETH Market-Cycle Oscillator provides a composite view of Ethereum's market state by blending two fundamental metrics: MVRV Z-Score and adjusted Spent Output Profit Ratio (aSOPR). The indicator first processes raw MVRV Z-Score and aSOPR data using a configurable smoothing period. It then derives normalized values for both metrics through a combination of rolling min-max scaling and cumulative expansion, ensuring each input is bounded and comparable. The final oscillator value is calculated as a weighted average of these two normalized components, reflecting their combined influence on market cycle positioning. The visible output plots this oscillator alongside the ETH price on a logarithmic scale. Users can adjust the 'val_weight' parameter to shift the balance between MVRV-based valuation and aSOPR-based profit/loss sentiment. This tool is designed to assist in monitoring relative market positioning over time.