Author: Clow
The market has been chasing AI coins for three years, but the one that is actually used by AI may not have been in most people's minds from the very beginning.
The most counterintuitive thing is that the AI agents actually running on the network, such as FET, TAO, and RENDER, which have "AI" in their names, are not actually used by the cryptocurrencies themselves.
A true AI agent running on the network doesn't need FET to buy GPU computing power, doesn't need TAO to call APIs, and doesn't need a renter to pay royalties to the model. A single AI agent can send hundreds of payments per second, which is simply unsustainable with credit card fees of 2.9% plus a fixed fee of $0.30; AI agents require sub-second settlement, while ACH wire transfers are still calculated in three-day increments; AI agents don't look at the screen or click buttons, rendering all processes requiring human "confirm payment" completely ineffective.
All those things that claim to be AI tokens are completely absent from the real AI economy.
But money is still flowing frantically between the machines, hundreds of millions of dollars every day. What is flowing through it?
Who exactly is the AI Token?
It's not FET, not TAO, and not RENDER.
It's USDC.
A status code that had been shelved for thirty years suddenly came to life.
In 2025, Coinbase, together with Circle and Google, did something very strange. They unearthed something that had been hidden for thirty years.
HTTP 402.
The HTTP protocol has several status codes that we see every day: 200 for success, 404 for not found, and 500 for server outage. But the 402 status code has remained empty since the protocol was drafted in the 1990s; its official name is Payment Required. The drafters reserved it, meaning that one day the internet would need a native payment mechanism.
As a result, it remained unused for a full thirty years. It wasn't until the x402 protocol was introduced in 2025 that it was activated for the first time.
The meaning is simple. Previously, when an AI agent accessed a paid API, it required registering an account, obtaining an API Key, linking a credit card, and then a human confirming. Now, that's unnecessary. The agent sends a request, and the server directly returns a 402 status code containing payment metadata, clearly stating the amount, receiving address, and accepted payment chain. The agent's wallet sees the 402, automatically processes a USDC transfer, resends the request, and it's all done within two seconds.
There is no account, no API key, and no human confirmation.
Jeremy Allaire gave a figure: in the next three to five years, there will be "billions" of AI agents running on the internet, issuing payments 24 hours a day. This number sounds exaggerated, but if you accept the premise that machines work thousands of times more frequently than humans, it immediately becomes very reasonable.
A technical staff member might sign 10 contracts a day, while an agent might sign 10 contracts in a second.
After the x402 protocol was activated, USDC's identity changed. It was no longer just a "stablecoin," nor was it something for cryptocurrency speculators to use as trading pairs. It became a protocol primitive for the machine-to-the-internet, placed on the same level as TCP/IP and HTTP.
Simply put, the internet has transformed from a network for "the exchange of information between people" into a network for "the transfer of value between machines." And the universal currency used for this transfer is USDC.
98% of the answers have already been cast.
Do you think this is just a narrative? The data has already cast its vote.
Circle's 2026 data shows that over 98% of agent-driven payments chose USDC. Not 60%, not 80%, but 98%. The average payment was $0.31, an amount a human would almost never initiate alone, since even a cup of coffee at Starbucks starts at $4. Such small transactions, amounting to 30 cents, can only be the work of machines.
Circle created its own blockchain called Arc, specifically for stablecoin finance. The cost per transaction on the Arc blockchain is not the previously cited $0.00001, but approximately $0.01.
What truly reduces USDC transfers to the level of $0.00001 is not a single gas transaction on the Arc chain, but rather the aggregation off-chain followed by unified settlement on-chain.
To compare: credit cards charge 2.9% plus 30 cents, while bank wire transfers range from $15 to $50. The fixed fees for traditional payments are an order of magnitude higher than the total amount of a single machine payment. For an AI agent to send a $0.31 payment through a traditional banking system, the transaction fees alone would be nearly 100 times its own cost. This isn't just "friction," it's "infeasibility." The real problem that stablecoin tracks solve isn't simply reducing on-chain costs to near zero for every transaction, but rather making such machine-based micro-payments feasible for the first time through programmable settlement and batch aggregation.
What about those that are actually called AI Tokens?
Cryptocurrencies like FET, TAO, and RENDER are rarely seen in the AI Agent's wallet. They reside in speculators' contract accounts, fluctuating by 5% to 10% daily. If an AI Agent uses TAO to pay for computing power rental fees, it might be able to pay for 1000 hours today, only 900 hours tomorrow, and 1100 hours the day after. It has no way to budget, no way to do financial planning, and certainly no way to sign any price-anchored contracts with external suppliers.
What's even more ironic is that those cryptocurrencies bearing the name "AI" don't circulate at all in the real AI economy.
They are meant for humans to cook, not for machines.
A "stablecoin" has ironically become the lifeblood of machine civilization.
TAO stands for electricity, and USDC stands for cash.
Some might argue that FET and TAO are completely useless.
Yes, they have their own context. But that context is never "currency," but "commodities."
HashKey, in a Web3 report, offers a more precise dichotomy: AI tokens are the smallest semantic units of computing power consumption, similar to electricity and gas; blockchain tokens, on the other hand, are the smallest programmatic units of value flow, which are cash.
Let me translate. TAO is like the electricity flowing from your home's electrical outlet, and USDC is like the cash in your wallet. You use TAO to train models, allocate computing power, and run inference, just like you use electricity to light up your room or boil water. But you wouldn't take a kilowatt-hour of electricity to the supermarket checkout; you would use cash.
An AI agent might use TAO to coordinate computational tasks within its internal network. But once it ventures out into the world—renting AWS servers, ordering plush toys from Amazon, or paying a human freelance writer—it will only accept USDC. This is because AWS doesn't accept TAO, Amazon doesn't accept FET, and human workers certainly don't accept rent as wages.
The two sides of the balance sheet are completely different things.
In late 2024, Stripe acquired Bridge, a stablecoin infrastructure company, for $1.1 billion. This figure didn't attract much attention at the time, but in retrospect, it signaled a traditional payment giant's surrender to machine payments. A company that had relied on credit card fees for two decades bought a ticket to the machine economy for $1.1 billion.
VanEck then made a prediction: by 2027, the daily volume of on-chain automated transactions driven by AI agents will reach $5 billion, with a compound annual growth rate of over 120%.
$5 billion a day, that's $1.8 trillion a year.
What does this figure mean? Currently, the daily volume of global cross-border payments via SWIFT is approximately $5 to $6 trillion. This means that in three years, automated transfers between AI agents could account for one-third of global cross-border payments.
And almost all of this 1.8 trillion will go through USDC.
summary
The market has misrepresented the story of AI Token.
The true AI token isn't FET, TAO, or RENDER; those are speculative tools used to bet on the future appreciation of some AI infrastructure. The true AI token is USDC, the settlement currency used daily by AI Agents with real money.
One is a narrative, the other is a water pipe. One tells stories to humans, the other runs production for machines.
How will the pendulum swing? In 2022, everyone thought everything labeled "AI" was valuable; in 2024, everyone thought everything labeled "AI" was a bubble; and in 2026, the real winner will be a "stablecoin." Wall Street's pricing logic is always slower than technological reality, and this time is no exception.
The internet didn't kill the real economy; the real economy learned e-commerce. Cryptocurrency didn't overthrow the dollar; the dollar learned to go on-chain. AI didn't create a new currency; AI chose the oldest one, the dollar, and then used its programmatic version.
Is the "AI Token" you bought actually being used by AI?
A true AI token doesn't need the name "AI".
