The $33 trillion asterisk

Nobody fact-checks a bullish headline. A few months ago I wrote that stablecoins had surpassed ACH in monthly settlement volume, and the line did exactly what lines like that do - it traveled. It is also true, which is the dangerous part. True statements with a narrow frame are how entire markets talk themselves into conclusions the data doesn't support. So consider this essay the correction I owe my own chart.
The annual picture
Zoom out from one good month to the full year and the picture rearranges itself. On an annual basis for 2025, stablecoins settled roughly $33 trillion. ACH settled $89 trillion. SEPA, by my full-year projection built on available ECB data and historical growth trends, reached about $259 trillion - a figure so large it makes the rest of the chart look like rounding error.
This is the trouble with absorbed narratives. The monthly comparison was real, but it captured a moment, not a structure. Structurally, the plumbing of the developed world still runs through bank rails that most crypto commentary has never bothered to size. SEPA alone moves nearly eight times what all stablecoins combined moved last year. You cannot claim to be replacing a system you are still an order of magnitude away from matching.
What the $33 trillion actually is
The honest cut goes deeper. That $33 trillion headline number is settlement volume - every transfer that touched a chain, including exchange flows, market-making, arbitrage loops, and the same dollar bouncing between wallets five times before lunch. Strip that out and ask a narrower question: how much of this is actual payments, someone paying someone for something?
The answer hovers around $250 billion. Not trillion. Billion. Against ACH or SEPA, that is not a competitor, it is a rounding error on a rounding error. It is also, and this matters, exactly what an early-stage payment system looks like. Card networks in their first decade were a curiosity too. The gap between headline volume and organic payment volume is not a scandal - it is a measure of how young this market still is, and anyone quoting the big number without the small one is selling you something.
Where the comparison flips
None of this means the bearish frame wins. Run the comparison against the systems stablecoins most resemble - consumer and commercial payment networks rather than interbank plumbing - and the result is startling. Visa, Mastercard, Amex, and PayPal together settled about $30.5 trillion in 2025. Stablecoins did $33 trillion.
Four decades of card network infrastructure, hundreds of millions of terminals, the most entrenched consumer habits in finance - and a technology that barely existed ten years ago now moves more value annually than all of them combined. Yes, the volume is a different kind of volume. But the rails are real, the settlement is final, and the growth curve has not flattened once.
The long game
So both things are true at once, and the discipline is holding them together. Stablecoins lag ACH and SEPA by multiples on annual volume, and their organic payment activity is still in its infancy. Stablecoins also already out-settle the entire card network complex, on infrastructure that gets cheaper and faster every year while bank rails get committee meetings.
Growth compounds quietly and then all at once. The monthly ACH crossover that started this essay was not the finish line I framed it as - it was an early data point on a curve that keeps bending the same direction. The future of stablecoins is not a prediction anymore. It is a volume chart, updating year after year, and the only real question left is how long the asterisks stay attached.