AI Agents Are Emerging as Crypto’s Next Payment Frontier, and Stablecoins Have an Early Lead

Software agents that complete tasks on behalf of users are beginning to make their own payments, and stablecoins have taken an early lead in funding those transactions. 

Coinbase, Cloudflare, Mastercard, Visa and MoonPay are each building infrastructure for agent-driven payments, but the market remains small and unsettled, with usage figures largely self-reported and adoption still concentrated in low-value transactions. 

This is an emerging-technology trend rather than a confirmed shift in payments infrastructure, and the companies involved have disclosed only partial data on how these systems are actually used.

Agents Are Paying Machines, Not Shopping for Shoes

AI agents capable of multi-step tasks increasingly need to pay for the services they use to complete those tasks, whether that is data access, computing power or a specific online tool. 

Coinbase built a payment protocol called x402 for this purpose, while MoonPay’s PayBox gives agents access to a user’s cards and crypto wallets. Cloudflare rolled out Cloudflare Wallets and cloudflare.pay this month, aiming to let agents make online purchases within preset limits.

Most disclosed transaction volume is going to application programming interfaces, the connections that let one piece of software request data or a service from another, rather than to consumer-facing purchases like travel bookings or retail shopping. Coinbase said earlier this year that x402 had processed more than 165 million payments worth a combined $50 million.

Lincoln Murr, Coinbase’s head of AI product, estimated that approximately 99% of those payments used USDC, though the company has not independently verified that figure beyond Murr’s estimate. 

Coinbase’s April count showed more than 480,000 agents active on x402, implying an average transaction size of roughly 30 cents, according to the disclosed volume and transaction totals. 

Murr said 25% to 30% of that activity may reflect users attempting to climb public leaderboards rather than genuine service purchases, a caveat that tempers the scale of confirmed real-world usage.

Why Stablecoins Have an Edge in Small, Frequent Payments

Stablecoins fit the economics of very small, high-frequency transactions better than card networks, according to the companies building agent payment infrastructure. Murr put typical card acceptance costs at 2% to 4% of a transaction, a rate that becomes impractical for purchases costing a few cents.

Cloudflare Chief Strategy Officer Stephanie Cohen said:

“Stablecoins are particularly well suited to the kinds of transactions we expect AI agents to make at first, essentially lots of very small, high-frequency payments for things like API calls, data, inference, and content.”  

Cloudflare’s Wallets product is designed to function similarly to a corporate card. An operator deposits funds into a main wallet, then gives an agent a smaller allowance along with rules covering its budget, approved sellers and maximum purchase size. 

The company said small purchases can be batched together before being recorded on a blockchain, reducing fees, and can be paired with escrow that holds funds until a seller delivers what was purchased. 

Much of this infrastructure remains under development. Users can currently claim an identity through cloudflare.pay, but funding, withdrawals and wallets for agents are not yet live.

Stablecoin issuer Circle is testing a comparable approach through a nanopayments product currently on testnet, confirming small payments quickly before recording their combined value on a blockchain.

Card Networks Are Building Competing Rails, Not Conceding the Market

Visa and Mastercard are adapting their existing networks for agent purchases rather than ceding the category to stablecoins. 

Mastercard’s approach, called Agent Pay for Machines, uses a digital spending voucher system in which an account owner defines what an agent can buy and how much it can spend. A seller checks those rules before claiming payment later in a batched settlement process. Mastercard Executive Vice President of Tokenization and Checkout Services Sapan Mandloi said,

“We see stablecoins as complementary to existing payment systems, not a replacement for them.” 

Mandloi said cards retain an advantage for larger purchases because they provide access to existing merchant acceptance networks, credit, and dispute-resolution systems. Mastercard’s product is in an early access program, and the company has not disclosed transaction or adoption figures.

Visa and DBS Bank piloted a system in February that let an agent purchase food and drink using DBS and POSB credit and debit cards. 

The banks are now exploring extending the pilot to online shopping and travel bookings, categories that involve larger purchase sizes and more established refund and dispute infrastructure than the microtransactions currently dominating stablecoin-based agent payments.

Unresolved Questions Over Control and Liability

Restricting what an agent is authorized to spend, rather than the payment rail itself, has become a shared focus across the companies building this infrastructure. 

Coinbase, Cloudflare, Mastercard, MoonPay and wallet provider Turnkey are each developing systems that cap balances, limit approved sellers and require human approval for larger or more sensitive purchases.

Turnkey co-founder and Chief Executive Bryce Ferguson compared the current stage of development to early self-driving cars, in which a human still needed to supervise the system even as autonomy expanded over time. According to Ferguson: 

“Crypto rails are better suited to single API calls or small data purchases, while agents will likely continue using credit cards and bank credentials for conventional purchases such as groceries or clothing.”

Cohen said the economics of fraud protection shift with transaction size: mitigating fraud on a payment worth a few cents can cost more than the fraud itself, while card rails remain a better fit for larger payments where fraud protection has clearer value. 

None of the companies interviewed could say who bears responsibility when an AI agent follows its spending rules correctly but still makes a purchase its owner did not intend.

What Remains Unproven

Disclosed dollar volume across agentic payment systems remains small. x402 moved approximately $24 million over 30 days in July, a fraction of the volume Visa’s network processes in a single minute. 

Cloudflare’s wallet infrastructure is still in development, Mastercard’s product is in early access, and MoonPay has not disclosed adoption figures for PayBox.

Getting funds into an agent’s wallet in the first place remains a practical barrier to adoption, according to Murr, who said Coinbase is exploring fiat on-ramps as a solution. 

Whether stablecoins retain their early lead as the market matures, or card networks close the gap through their own agent-focused products, remains an open question that current disclosed data cannot yet answer.