AI agents are becoming a new customer class for payment systems. They are starting to pay on their own for data, compute, and online tools, and stablecoins, particularly USD Coin (USDC), have moved early in this high-frequency, low-value machine-to-machine payment market.
Coinbase, Cloudflare, MoonPay, Visa, and Mastercard are all building rails around that shift. Coinbase said its x402 payment protocol has processed more than 165 million payments worth a combined $50 million so far, with about 99% of those transactions settled in USDC.
Software, not people, may be the next wave of users
As AI agents move beyond chatbot functions and start carrying out multi-step tasks on their own, crypto’s long-discussed "next billion users" may be arriving in an unexpected form. The user may not be an underbanked consumer or someone fleeing inflation. It may be software.
In that setting, stablecoins have been among the first payment tools to gain traction. Coinbase’s x402 protocol is effectively a paywall built for software. When an agent requests data or a service, the seller returns pricing and payment details, the agent pays, the system verifies the transfer, and the service is delivered. The process does not require a human in the loop. Sellers do not need to open accounts for every buyer, and agents do not need to manually enter card credentials.
Lincoln Murr, head of AI products at Coinbase, put it bluntly: 「Right now, product-market fit is agent-to-API machine-to-machine payments.」
Coinbase’s numbers show scale, but also noise
Earlier this year, Coinbase disclosed that x402 had handled more than 165 million payments totaling $50 million. In an ecosystem update released in April, the company also reported more than 480,000 agents.
Murr estimated that roughly 99% of those transactions were settled in USDC, with an average ticket size of around $0.30. He also said the market is still in what he called the "Napster and LimeWire era." In his view, the sector looks a lot like the early internet: broad experimentation, little agreement on the business model, and plenty of activity that does not yet represent durable demand.
He said 25% to 30% of transaction volume comes from testing behavior tied to public leaderboards rather than actual purchasing needs.
Even by dollar value, the disclosed scale remains small. On July 30, x402 moved about $24 million in a single day, a figure the report said is roughly equal to one minute of Visa processing volume. Murr’s point was not that x402 is already large, but that the structure is different. A single software agent completing one task may pay dozens of separate services along the way, breaking what would have been a monthly subscription into a stream of micropayments worth only a few cents each.
Why stablecoins fit early agent payments
These first payment use cases line up closely with crypto’s strengths: global reach, round-the-clock operation, and transaction values so small that card economics become difficult.
Murr said card acceptance costs are around 2% to 4%. Once the product price drops below $1 and fixed processing fees are added, that model starts to break down. Stablecoins can avoid some of that friction, and sellers or payment providers can absorb on-chain fees directly.
Stephanie Cohen, Cloudflare’s head of wallet design strategy, said stablecoins are especially well suited to the early AI agent environment, where payments are frequent, low in value, and tied to API calls, data access, and inference output.
Cloudflare, Circle, and MoonPay are building different pieces
Cloudflare is planning a Monetization Gateway that would let websites charge on a per-use basis for individual pages, datasets, or online tools instead of bundling access into a monthly subscription.
Circle’s Nanopayments system is designed to confirm small payments quickly on testnet first and batch them on-chain later. MoonPay’s PayBox, meanwhile, lets agents call directly on user cards and crypto wallets, while supporting both x402 and Visa rails.
Card networks are still in the race
Traditional payment networks are not giving up the field. Mastercard has launched Agent Pay for Machines, using Verifiable Vouchers to define what an agent can buy and how much it can spend. Sellers check the rules, provide the service, and submit batched claims later, instead of sending every micropayment through full clearing and settlement flows.
Sapan Mandloi, executive vice president for tokenization and checkout services at Mastercard, said: 「Agent commerce will be a multi-rail environment, and stablecoins will complement existing payment systems rather than replace them.」
Banks are testing the space as well. In February, DBS and Visa demonstrated an agent making purchases with a DBS/POSB credit card. The next step is to test online shopping and travel bookings. Those are larger-value transactions that need refunds and dispute handling, a very different setup from a $0.30 API payment.
Control matters as much as the rail
Paying is only part of the problem. Agents can misread instructions, choose the wrong service, or even be manipulated by malicious prompts. That is why "limit first, then let the agent act" has become a shared defensive approach across Coinbase, Cloudflare, Mastercard, MoonPay, and wallet provider Turnkey.
The controls being discussed include balance caps, whitelisted merchants, per-transaction spending limits, and human approval for sensitive actions.
Bryce Ferguson, co-founder of Turnkey, compared the current stage to early self-driving systems: 「It’s like needing someone with a hand on the steering wheel. That’s where agents are right now.」
Cohen pointed to another issue. If a payment is only worth a few cents, the cost of fraud prevention may exceed the loss itself. In that case, seller reputation can matter more than a full dispute-resolution process.
The market is still early, and wallet onboarding remains a bottleneck
For now, agent payments remain far behind the most optimistic projections. Cloudflare’s wallet product is not fully launched, Mastercard is still in early pilots, MoonPay has not disclosed usage scale, and Turnkey said activity has not yet reached a level that can be called scaled. Even x402, the most mature example in the report, still sees a meaningful share of volume tied to leaderboard testing rather than real purchases.
Murr said the biggest bottleneck may be the first step: getting money into an agent’s wallet. He called wallet application and onboarding "a huge pain point."
For readers in Taiwan and across Asia, the report argued that the larger takeaway is infrastructure. As subscription models face pressure from pay-per-use pricing, stablecoins are likely to keep getting tested in cross-border and micropayment use cases. The report also noted that x402 activity is concentrated on Base, Coinbase’s layer-2 network, suggesting that on-chain micropayment demand is now being measured in live usage rather than left as a slide-deck concept.
Three issues stand out for follow-up: when Cloudflare and Mastercard products move from pilots to commercial rollout, whether the industry can agree on responsibility when agents make mistaken purchases, and whether fiat onramps become the main funding source for agents. Those questions will shape whether stablecoins’ early lead turns into something larger.