Circle has introduced the x402 payment protocol and the Agent Stack developer toolkit, aiming to help API providers take payments in USD Coin (USDC) and support pay-per-use business models. The setup is designed for the emerging market of autonomous AI agents, where machine customers can call services and pay for them directly instead of going through subscriptions or traditional checkout pages. Circle grouped the services into three categories: data intelligence, digital infrastructure, and real-world execution. The examples cited include market data, browser automation, and local delivery. The company also said developers can convert existing endpoints into services that agents can call, with preset pricing that enables instant transactions. That structure is intended to open up micropayment use cases that were previously difficult to monetize because the payment amounts were too small.
Circle has rolled out the x402 payment protocol and the Agent Stack developer toolkit to help API providers accept payments in USD Coin (USDC) and offer pay-per-use pricing.
The product is aimed at the autonomous AI agent market, allowing machine customers to call services and pay for them directly without using subscriptions or checkout pages.
Three service categories
Circle said the offering covers three types of services: data intelligence, digital infrastructure, and real-world execution. Examples include market data, browser automation, and local delivery.
Existing endpoints can be turned into agent-ready services
Developers can convert existing endpoints into services that support agent calls and set preset prices for instant transactions. Circle said the approach expands micropayment use cases that had been hard to monetize because the transaction amounts were too small.
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