Coinbase-backed study pegs stablecoin transfers at $400M an hour, mostly after the banks close

Stablecoins moved more than $400 million per hour on average in "organic" transfer activity during the third quarter, according to a report titled "The Always-On Dollar" from Coinbase and The Block Pro Research, covered by The Block on October 20. Over the 12 months ending July 31, the study found, roughly 73% of screened transfer volume settled outside U.S. banking hours — the headline case for round-the-clock dollar rails.

The report puts adjusted stablecoin transaction volume at $891 billion in Q3, which it says is a quadrupling since the start of 2023, and projects $1.5 trillion in quarterly adjusted transfer volume by the end of 2027 at current growth rates. On cost, it cites a $200 USDC remittance on Base as about 86% cheaper than traditional rails. It also counts 293 million unique blockchain addresses holding stablecoins — while noting, in the same breath, that addresses don't necessarily map to individual users.

Key facts

• Over $400M/hour average in organic stablecoin transfers in Q3 (Coinbase / The Block Pro Research, via The Block).
• ~73% of screened volume settled outside U.S. banking hours over the 12 months to July 31 (same report).
• Adjusted transaction volume of $891B in Q3, up ~4x since early 2023; projected $1.5T quarterly by end-2027 at current rates (same report).
• $200 USDC remittance on Base ~86% cheaper than traditional rails (same report).
• 293M unique addresses hold stablecoins; report concedes addresses ≠ individuals (same report).
• 7 of the 10 largest U.S. banks have tested stablecoins or tokenized deposits; the other 3 signaling plans (same report).

The real-world read

Consider the source. This is a Coinbase study — Coinbase earns on USDC reserves and sells stablecoin infrastructure, so it has a direct commercial interest in stablecoins looking large and inevitable. Treat the numbers as an interested party's framing, not neutral measurement. Note too that The Block is reporting on research it co-produced, so the "study finds" framing is partly a house product.

The metrics are heavily filtered — "organic," "screened," "adjusted." Those qualifiers are doing real work: they strip out bot and wash activity, which means the figures depend on Coinbase's own methodology, not disclosed here in detail. The forward-looking claims are projections dressed as momentum: the $1.5T forecast, the "$155 billion into global annual GDP" from moving 80% of international transactions onto stablecoins, and the pitch that stablecoins will be the rail for AI agents handling $3 trillion to $5 trillion of B2C commerce by 2030 (that last figure attributed to McKinsey). None of those are facts; they're forecasts, and they happen to flatter the sponsor's business.

Opinion, and whose

Coinbase and The Block Pro Research argue faster settlement frees up working capital for businesses and that stablecoins will become the default payment rail for AI agents. The $3–5 trillion agentic-commerce figure is McKinsey's. All of it is forecast, not established fact.

Sources

• The Block (reputable secondary), Oct 20, 2026 — reported the study's figures and quotes. Note: The Block co-produced the research via The Block Pro Research.
• "The Always-On Dollar," Coinbase / The Block Pro Research (primary, but an interested party) — all figures and projections originate here; Coinbase has a commercial stake in stablecoin adoption. Treat as sponsored-adjacent.

Not financial advice.