Coinbase US500 hits $104M matched volume, later reading falls

Coinbase posted a chart showing a trailing 24-hour matched volume peak near $104 million for its US500 futures around Aug. 25–26. A preserved product-page snapshot taken on Aug. 28 recorded $7.22 million in 24-hour matched volume and $3.01 million in open interest about 15 hours after the chart was shared, reflecting different measurement windows rather than a reversal of the earlier peak.

The $104 million figure appeared on a chart shared by Coinbase CEO Brian Armstrong that tracked trailing 24-hour matched volume after the US500 contract began trading on Aug. 17. Matched volume reports trades executed over a rolling 24-hour window. Open interest counts outstanding positions at a specific point in time. Neither metric discloses how many unique traders participated or the amount of unique capital behind the trades.

Coinbase self-certified the contract with the Commodity Futures Trading Commission on July 30. The US500 instrument is a five-year, U.S. dollar-settled equity-index future that began trading on or after Aug. 17 and initially expires on the third Thursday of December 2030. Positions settle in cash; holders do not receive ownership or voting rights in the index components. The contract clears through Nodal Clear and operates under exchange position limits, price limits and market-wide circuit breakers.

The contract uses a crypto-style funding mechanism adapted for the futures format. Coinbase Derivatives calculates an hourly funding rate from the spread between the futures mark and the spot mark. The clearing house aggregates hourly funding payments during its midday and end-of-day margin runs and applies those amounts as cash adjustments to positions.

The US500 contract references the MarketVector Top 500 US Profitable Companies Continuous Index, identified as MVPUSC in the filing. MarketVector’s index began on Aug. 7 and listed 501 components at the Aug. 28 reading. The index differs from the S&P 500; the futures contract provides cash-settled exposure to MarketVector’s benchmark rather than to a tokenized basket of S&P 500 shares.

Trading for the contract follows a defined session that runs from Sunday at 8 p.m. Eastern Time to Friday at 5 p.m. Eastern Time, with market holidays and other closures. Coinbase’s consumer-facing pages sometimes use “24/7” language, but the CFTC filing and the product session specify a Sunday-to-Friday schedule.

The preserved Aug. 28 product-page reading showed a funding rate of negative 0.0001%, indicating shorts were paying longs at that snapshot. A single hourly funding reading does not establish a sustained directional imbalance; a longer funding history would be needed to identify repeated payments from one side of the market or rates that oscillate around zero.

Metrics that would indicate whether high activity continued beyond the launch window include repeated turnover across ordinary trading sessions, stable or rising open interest over multiple days, usable order-book depth and narrow spreads, a longer funding-rate series, and data on participant breadth and position concentration. The published chart and the later product snapshot provide differing windows into activity during the contract’s first weeks.