Just read that stablecoins are about 1.4% of US M2 money supply. That number stuck with me because of how small it is. Every dollar of stablecoin out there right now is a sliver of the actual money in the system. Not 30%. Not 10. About one and a half percent.
We're nowhere near the start of this. And I think x402 paired with crypto rails ends up being the infrastructure most of it gets built on.
Coinbase shipped x402 last year — sounds like a boring protocol update, but it's actually the rails for what's coming. HTTP 402 was the "Payment Required" status code that's sat unused in the spec for thirty years. x402 finally turns it on. An agent hits an API, the API says that'll cost you $0.003, the agent pays in stablecoin, gets the data back. No key to manage, nothing to subscribe to, nobody in the loop approving it. The transaction just happens.
Real microtransactions are what actually changes here — three-tenths of a cent moving between two pieces of software and settling in seconds, with a fee structure that doesn't eat the transaction alive. Credit card rails couldn't do this, which is a big part of why subscriptions became the default in the first place — a workaround for payments that never actually fit the use case. Now they fit.
What I'm trying to position around is what happens next. Agent-to-agent commerce. Human-to-agent commerce. Agents buying compute from other agents, paying a research agent a few cents to go pull and synthesize something, subscribing to a data feed for the next 90 seconds and no longer. All of it settling in stablecoins, because stablecoins are the only thing that moves at the speed agents move.
Existing businesses will have to rewire their infrastructure to plug into this, and the ones that don't are going to get eaten. New businesses probably won't look anything like the packaged products we have now. Software's default shape has been a monthly subscription to a bundle. Agents don't want the bundle. They want the one piece they need, right now, priced at what it's actually worth.
Stablecoins are 1.4% of M2 today, and the agent economy hasn't even started transacting yet. That's the whole TAM story right there.