- Circle has announced the launch of a new agent service discovery layer.
- The service will redefine how AI agents interact with the internet economy.
- AI assistants with funded wallets can manage dozens of individual software subscriptions.
Circle, the fintech company behind the USDC stablecoin, has launched a new agent service discovery layer. CEO Jeremy Allaire noted that the new protocol will enable agents to discover usable, consumable services using USDC and x402, building on their growing marketplace with 900+ endpoints for agentic services.
Circle explained that its Agent Stack now gives builders programmatic access to a curated discovery layer for agentic services. With the firm’s Discovery API, builders can query the full Agent Marketplace catalog through a single public endpoint without requiring an API key, authentication, or a Circle account.
From a user’s perspective, Circle’s newly launched service is expected to fundamentally redefine how artificial intelligence (AI) interacts with the internet economy. It would enable AI agents to be treated as sovereign financial actors rather than mere scripts.
How Circle’s Discovery API and x402 Work
The new service from Circle resolves a traditional issue that caused friction for AI agents. It uses automated, machine-native discovery and transactions to allow AI agents to perform services such as filling out credit card forms, bypassing CAPTCHA challenges, or signing up for recurring subscriptions.
Circle designed the solution to query its Discovery API and search for pre-screened compliant web services and APIs based on criteria such as category, blockchain, and pricing structure. The agent then calls the desired service endpoint natively via HTTP without any prior registration or API keys.
The service server responds to the call with a standard HTTP 402 Payment Required status code containing a machine-readable payload specifying the price, acceptable tokens, and the payment destination address. The final step involves the agent’s wallet cryptographically signing a payment authorization payload and retrying the HTTP request. An underlying facilitator instantly verifies the payload and settles the USDC on-chain. The service unlocks and returns the requested data or output immediately.
How Can Individuals Use Circle’s New Service?
Circle’s new agent service allows users to deploy a single personal AI assistant with a funded wallet to manage dozens of individual software subscriptions. The assistant can handle complete workflows by paying for resources incrementally on a pay-per-request basis.
AI agents running on this protocol can engage in on-demand computing, data gathering and scraping, and perform pay-per-inference tasks from a specialized niche AI model found in the Circle Agent Marketplace. They can also manage micro-subscriptions, breaking bulky payments down to more convenient, manageable schedules.
Who Controls the Wallet?
It is crucial to note that users remain the ultimate owners and controllers of funds under the current system, despite the high level of autonomy. The new service is designed to operate via Circle’s Developer-Controlled Wallets secured by Multi-Party Computation (MPC) technology.
The AI agents operate under full supervision enabled by fragmenting the cryptographic keys. Fragmentation ensures the agents do not have unmonitored access to the master seed phrase. This process limits their role to simply authorized signers for specific, tightly defined transaction rules.
Spending limits for AI agents are enforced programmatically at the smart contract or wallet policy layer. Users define hard constraints such as a maximum per-transaction cap, periodic rolling budgets, and whitelists.
What if an Agent Makes a Mistake?
Blockchain transactions are immutable, meaning that a mistake in the AI agent transaction process cannot be reversed. Hence, mistake mitigation on Circle’s new agent service discovery layer relies on structural risk limits.
The system implements an isolated funding model, restricting users from linking their primary bank accounts to AI agents. Therefore, maximum losses are limited to the capital allocated to specific agent wallets. Additionally, the service consists of deterministic circuit breakers that activate when an agent triggers an unusually high frequency of 402 payment requests within a short window. Under such circumstances, the wallet software automatically revokes the agent’s signing permissions and alerts the human user.
Related: AI Agents Growing Dominance Across Emerging Tech Ecosystems
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