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The question of how AI agents pay for things, and each other, is no longer theoretical. Circle, Coinbase, and MoonPay have each shipped distinct infrastructure that collectively sketch what the agent payment stack looks like in 2026. Weekly x402 transactions have grown significantly since May 2025. Coinbase’s Payments MCP recorded a 10,000% spike in agent transactions on Base.
Also, stablecoin transaction volume hit $33 trillion in 2025, rising 72% year-over-year. The approaches differ significantly, and the differences matter.
Circle Nanopayments enables permissionless, high-frequency programmable USDC payments. It could be as small as $0.000001 with zero gas costs, targeting autonomous machine-to-machine transactions at internet speed.
Circle Nanopayments are now live on testnet.
Send $0.000001.
Pay zero gas.
Power AI agents.The financial rail for agentic commerce: https://t.co/06qSUE6CqF pic.twitter.com/uHpmLJXYFl
— Circle (@circle) March 3, 2026
The mechanism bundles micro-transfers into batched on-chain settlements, meaning the gas cost is amortized across thousands of transactions. It makes the unit economics of a $0.000001 payment viable in a way that standard on-chain transfers are not.
Use cases include pay-per-API-call billing, per-second compute charges, and machine-to-machine marketplaces where robots pay for electricity and operating costs autonomously.
How do Circle’s Nanopayments work?@circle has unveiled a new feature called Nanopayments.
It allows transfers as small as $0.000001 while claiming zero gas fees. How is that possible?
The secret lies in batched settlement.
If every payment created its own onchain… pic.twitter.com/uZBntCWkJc
— 100y (@100y_eth) March 4, 2026
Critically, Nanopayments follows the x402 standard and supports cross-chain movement across any Gateway-supported EVM chain, meaning it plugs into the same protocol layer already backed by Cloudflare, Google, and Stripe.
x402 is an open HTTP-native payment standard that operationalizes the long-reserved HTTP 402 “Payment Required” status code. It allows a server to declare payment terms and a client, typically an AI agent, to pay programmatically using stablecoins and retry the request, without accounts, API keys, or subscriptions.
HTTP had 402 “Payment Required” for decades.
Nobody used it.We are now.
x402 turns billing into a protocol primitive for Voice AI.
Pay-per-request
Programmatic
STT from $0.005/min (outplays competition)Checkout = Request => Agentic economy growth Without humans touching it pic.twitter.com/zSu9KZGkGJ
— dTelecom (@dtelecom) March 3, 2026
Since launching in May 2025, x402 has processed 75.41M transactions, being integrated as the crypto rail within Google’s Agent Payments Protocol (AP2). It is also backed and supported by 60+ organizations including Mastercard, American Express, and PayPal, and established a neutral governance foundation with Cloudflare.
Circle Nanopayments sits on top of this standard; it is x402-compliant by design.
Where Circle targets developers building pure on-chain agent infrastructure, MoonPay is solving the capital access problem at the entry point. MoonPay Agents is a non-custodial software layer that gives AI agents access to wallets, funds, and the ability to transact autonomously.
Your AI agents need crypto. Now they have it.
Introducing MoonPay Agents, the non-custodial infrastructure for autonomous transactions.
➡️ Onramp
🔀 Swap across chains
🔁 Trade onchain
⬅️ OfframpMulti-chain. Native x402 support. One CLI prompt.
🤖 https://t.co/7Shff929Og pic.twitter.com/zlTYlns1tW
— MoonPay 🟣 (@moonpay) February 24, 2026
The product supports the full financial lifecycle from fiat funding through crypto execution to fiat off-ramp. It includes x402 compatibility for machine-to-machine payments, real-time cross-chain swaps, recurring buys, and virtual accounts accepting Apple Pay, Venmo, and PayPal.
The distinction from Circle is architectural. MoonPay Agents requires a one-time human KYC step to fund the wallet, then hands autonomy to the agent. Circle Nanopayments assumes the USDC is already on-chain and focuses on the payment microstructure from there. They are complementary layers, not competing products.
Stablecoin transaction volume reached $33 trillion in 2025, rising 72% year-over-year, with supply surpassing $300 billion, and Coinbase’s Payments MCP recorded a 10,000% spike in agent transactions on Base alone. The bottleneck is now infrastructure standardization. It’s a question of which payment protocol becomes the TCP/IP of agent commerce, and whether KYC requirements at the funding layer create a compliance ceiling that limits how truly autonomous these systems can become.
Erik Reppel’s prediction, that “2026 will be the year of agentic payments, where AI systems programmatically buy services like compute and data. The framing that most people will not even know they are using crypto” may be the most accurate. The payments are already happening. The infrastructure is already deployed. The race now is for which stack becomes invisible enough to scale.
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