Autonomous software programs known as AI agents have begun executing financial transactions independently, purchasing computational resources, datasets, and software services without requiring manual human approval for each transaction. The novelty is not software consuming paid services—programs have long called metered APIs—but software holding balances and settling bills on its own, a shift that makes payment rails a foundational layer for increasingly autonomous AI workflows. Crypto’s next billion users might not be human—they could be AI agents, and they are already paying with stablecoins.

Crypto’s next billion users might not be human.

They could be AI agents and they’re already paying with stablecoins.

Coinbase’s x402 has processed:

• 165M+ payments • $50M in volume • Around 99% paid in $USDC

AI agents are buying data, computing power and API access for… pic.twitter.com/zpVXrbYG3J

— MANDO CT (@MandoCT) August 23, 2026

Coinbase’s x402 Has Handled More Than 165 Million Payments

To serve this emerging use case, Coinbase developed x402, a specialized payment protocol that functions as an automated paywall for software interactions. The name refers to HTTP 402, a “Payment Required” status code defined in the web’s core protocol decades ago but left almost entirely unused; Coinbase introduced x402 in 2025 as an open standard that puts the dormant code to work for payments between machines over ordinary web infrastructure. The process is streamlined: an agent submits a service request, receives pricing information, executes payment, and obtains the requested resource—all without traditional account setup or the entry of payment credentials.

According to Coinbase’s disclosed metrics, x402 has handled more than 165 million individual transactions representing a cumulative value exceeding $50 million. USDC, a fiat-collateralized stablecoin, accounts for roughly 99% of that transaction volume.

Lincoln Murr, who leads AI product development at Coinbase, said average transaction values hover around 30 cents. The majority of these payments flow toward API endpoints—interfaces that enable software-to-software communication and service requests.

The Stablecoin Advantage in Autonomous Commerce

Stablecoins offer clear advantages for this application. They operate continuously without downtime, facilitate borderless transactions, and circumvent the 2% to 4% processing fees inherent in traditional card-based payment systems. For sub-dollar transactions, conventional payment rails become economically prohibitive because of those fee structures.

Cloudflare, which is developing its own wallet infrastructure tailored to AI agents, emphasizes that stablecoins align well with the high-frequency, low-value transaction patterns characteristic of agent-initiated payments. The company’s forthcoming solution would function similarly to corporate payment cards, enabling operators to set spending limits and whitelist approved vendors before agents execute any transactions.

Circle, the company that issues USDC, is experimenting with rapid USDC microtransactions that achieve immediate confirmation while deferring blockchain settlement to batch processing. MoonPay, meanwhile, has introduced PayBox, a solution that integrates with AI assistants and enables agents to transact using either traditional card networks or cryptocurrency, depending on merchant acceptance.

Traditional Payment Networks Enter the Arena

Mastercard is actively positioning itself in this emerging market. The payments giant is piloting Agent Pay for Machines, a digital voucher-based architecture. Under this model, the agent’s operator establishes purchasing parameters and spending thresholds; merchants validate those permissions, fulfill service requests, and later redeem payment vouchers. According to Mastercard, merchants retain the flexibility to settle in either traditional fiat currency or stablecoins, which removes the need for payment-method alignment between the two sides of a transaction. The solution remains in limited early access, and Mastercard has not yet published performance metrics.

Visa collaborated with DBS Bank on a February pilot program in which an autonomous agent purchased food and beverages using traditional credit infrastructure. The partners are now exploring extensions into e-commerce and travel reservation applications.

The incumbents are also organizing collectively: Google, PayPal, Stripe, and Intuit are among the companies behind the Agent Payments Company, an initiative announced in late 2025 to develop interoperable standards for agentic commerce. The overlapping pilots effectively amount to a competition over which rails—public blockchains, card networks, or hybrid designs that let merchants accept either—serve as the default for machine-to-machine payments.

An Immature but Promising Ecosystem

Coinbase’s Murr drew a parallel between the current landscape and the early peer-to-peer file-sharing era exemplified by Napster and LimeWire: while the underlying technology demonstrates viability, regulatory frameworks and market maturity remain underdeveloped. Regulation, meanwhile, has moved unevenly: the U.S. GENIUS Act, signed into law in July 2025, created a federal framework for payment stablecoin issuers, while the broader rules for agent-driven commerce that Murr describes remain underdeveloped.

The scale gap remains substantial. x402 processed approximately $24 million over a 30-day period in July, while Visa’s network handles the equivalent volume in roughly 60 seconds. Cloudflare’s agent wallet system is still under development, and some portion of Coinbase’s reported transaction count likely represents testing activity rather than genuine commercial exchange.

Initial wallet funding remains a persistent friction point. Coinbase acknowledges ongoing efforts to streamline this onboarding process, including functionality that would enable agents to autonomously initialize their own wallets upon receiving appropriate instructions.