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Give your agents programmatic access to 1000+ curated endpoints with the new Discovery API
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CIRCLE AGENT STACK

The full-stack platform for the agentic economy

Build AI-native financial applications, discover and pay for services in a machine-readable marketplace, and equip agents with a wallet and balance. Circle Agent Stack provides the building blocks.
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Works with
Claude
Codex
Cursor
Claws
+ Custom agents

Legacy finance isn’t built for AI. Agent Stack is.

Agent Stack is purpose-built for agents from the protocol up. It delivers the tools developers need to ship AI-powered applications and the financial primitives agents need to hold value, discover services, and transact programmatically.

Powered by USDC

USDC is the trusted standard for agentic payments — 99%+ of agentic payments use it. It’s stable, liquid, regulated1, and moves at machine speed, 24/7.

Multichain and multi-protocol

Agents can transact across supported chains via x402, with new agentic payment protocols added as they emerge. No chain- or protocol-specific complexity to manage.

Open, composable building blocks

Open by default and composable into any application, without being locked-in. Get all the financial primitives agents need to hold assets, move value, and pay for services.

FULL STACK FINANCE

One stack. End to end.

Agent Stack gives agents a full economic runtime. Build, command, and discover the agentic building blocks needed to programmatically hold, transfer, and settle USDC.

Agent Marketplace

A curated directory where both humans and agents can discover, evaluate, and pay for the best agentic services in USDC. List your service to sell to agents, and give your agent programmatic access with our Discovery API.

Explore Agent Marketplace
Explore Agent Marketplace

Agent Wallets

Programmable USDC wallets for agents, with the ability to set guardrails like spend limits, per-service caps, contract or chain allowlists, and time-bounded sessions built in.

Explore Agent Wallets
Explore Agent Wallets

Circle Skills

GiIve your agents the best practices for agentic USDC payments, crosschain transfers, wallets, and smart contracts, plus Circle’s MCP server for the latest SDK and documentation.

Explore Skills
Explore Skills

Circle CLI

An agent-native command line interface for humans and agents to create wallets, define policies, discover services, and make transactions.

Explore CLI
Explore CLI

Nanopayments powered by Gateway

Sub-cent, gas-free USDC payments built for the high-frequency, machine-speed transactions agents need to operate.

Explore Nanopayments
Explore Nanopayments
SEE WHAT YOUR AGENT CAN DO

From assistant to economic actor

Prep for a meeting

"Pull context, pay a research service, and draft the brief."

Hit a paid API
Run curl -sL https://agents.circle.com/skills/setup.md for context, then "I'm meeting [name] from [company] about [topic]. Pull a brief on the company (size, funding, revenue), a profile on [name] (role, career arc, recent X posts), and flag anything in their last 10-20 tweets directly relevant."
Get briefed by phone

"Buy a phone number, scan X for trends, then call with a 30-second brief and take questions live."

Prep for a meeting
Run curl -sL https://agents.circle.com/skills/setup.md for context, then "Provision a phone number bound to my wallet, check X for the latest trends, then call me at [your number] with a 30-second briefing — answer any follow-ups live."
Improve socials

"Rank 30 days of posts by engagement. Surface top 5, bottom 5, and what hit vs. flopped."

Buy a .com domain
Run curl -sL https://agents.circle.com/skills/setup.md for context, then "Look at my X profile [@placeholder] and pull all my posts from the last 30 days. Rank by engagement (likes + retweets + replies + quotes) and show me my top 5 and bottom 5. Tell me what's working, what isn't, and what topics hit vs flopped."
Conduct deep research

"Pull this week’s top AI research. Return 5-8 papers or blog posts plus a short 'why it matters' on each."

Pay another agent
Run curl -sL https://agents.circle.com/skills/setup.md for context, then "Pull the most important new AI research papers from this week - arXiv, conference proceedings, lab blogs. Give me 5-8 specific papers with arXiv IDs, dates, and authors, plus 3 layered debates or launches I should track. One-line 'why it matters' per item."
View more use cases
Prep for a meeting
Run curl -sL https://agents.circle.com/skills/setup.md for context, then "I'm meeting [name] from [company] about [topic]. Pull a brief on the company (size, funding, revenue), a profile on [name] (role, career arc, recent X posts), and flag anything in their last 10-20 tweets directly relevant."
Get briefed by phone
Run curl -sL https://agents.circle.com/skills/setup.md for context, then "Provision a phone number bound to my wallet, check X for the latest trends, then call me at [your number] with a 30-second briefing — answer any follow-ups live."
Improve socials
Run curl -sL https://agents.circle.com/skills/setup.md for context, then "Look at my X profile [@placeholder] and pull all my posts from the last 30 days. Rank by engagement (likes + retweets + replies + quotes) and show me my top 5 and bottom 5. Tell me what's working, what isn't, and what topics hit vs flopped."
Conduct deep research
Run curl -sL https://agents.circle.com/skills/setup.md for context, then "Pull the most important new AI research papers from this week - arXiv, conference proceedings, lab blogs. Give me 5-8 specific papers with arXiv IDs, dates, and authors, plus 3 layered debates or launches I should track. One-line 'why it matters' per item."

Make every endpoint a storefront

List your API endpoint, accept USDC, and get paid per call. No checkout pages, no signup flows, no monthly contracts.

Accept USDC from agents

Empower your agents to spend

Build with the agent-native CLI, create agent wallets, and connect to the rest of Agent Stack.

Browse Agent Marketplace
Have questions? Contact us
woman working on laptop computer
Fund in one prompt
Run curl -sL https://agents.circle.com/skills/setup.md, and use the returned setup instructions to set up my agent wallet.

FAQs

Circle Agent Stack is a chain- and protocol-agnostic infrastructure purpose-built for the agentic economy, empowering agents to hold assets, transact, and access services across ecosystems.

USDC is already emerging as the default money for agents, powering 99.8% of x402 transaction value. It is stable, regulated1, globally accessible, and designed for programmability. Agents need predictable value and reliable settlement, and USDC provides both at scale.

This enables models that were previously not economically viable, such as pay-per-call APIs, real-time compute pricing, and high-frequency microtransactions. It also lays the groundwork for agent-to-agent transactions and more complex forms of machine-driven commerce.

The long-term vision is an economic system where agents can discover, decide, and transact autonomously. Payments become embedded into execution, and value moves programmatically across open, interoperable infrastructure. This is the foundation of the agentic economy.

Onramp, Transfer, Execute contract calls, Sign, Bridge, Trade/Swap, Pay for endpoints via Nanopayments.

Arbitrum, Arc testnet (mainnet coming soon), Avalanche, Base, Ethereum, Monad, OP Mainnet, Polygon PoS, Unichain

A spending policy is a set of programmable rules that restrict how an agent wallet can move funds or interact with smart contracts. These rules provide a layer of "onchain governance" to prevent unauthorized or excessive spending by an autonomous agent.

Services are validated and listed in a structured, machine-readable format that includes pricing, capabilities, and invocation methods. Agents can query the registry to find services relevant to their task on a one-off basis, or programmatically with the Discovery API.

Agents pay using USDC through Nanopayments or supported protocols like x402. Payment is embedded in the request, so access and payment happen in a single step without separate billing or authentication flows.

Any service that can be accessed programmatically, including APIs (LLM inference, data access), compute services, infrastructure services, digital goods, or content.

Visit https://forms.gle/7YFzvdmMcn1JH5tF6 to submit your service. We encourage all service providers and builders to list their endpoints and help unlock the agentic economy together.

1 USDC is issued by regulated affiliates of Circle. See Circle’s list of regulatory authorizations.

Agent Wallets, Agent Marketplace, Circle CLI, Nanopayments, and Circle Skills (together, the “Agent Stack”) are offered by Circle Technology Services, LLC (“CTS”). CTS is a software provider and does not provide financial, advisory, or marketplace services. Agent Stack enables users, developers, and their artificial intelligence agents ("AI Agents") to build, deploy, discover, hold and transact their own funds, and interact with other third-party AI Agents, applications and services. Transactions initiated by AI Agents are executed based on user-defined permissions and may occur without real-time human review. Circle does not verify, screen, monitor, or make any representations or warranties regarding the identity, legitimacy, safety, security, reliability, or performance of any AI Agent, including any AI Agent developed by you, other users, or third parties, or any AI Agent that interacts with the Agent Stack. AI Agents may operate unpredictably, may be controlled by unknown or unauthorized parties, and may expose users to security, financial, or other risks. Users are solely responsible for their use of these tools, reviewing commands before execution, and for evaluating associated risks. For additional details, please see the Agent Platform Terms of Use available at agents.circle.com/terms-of-use and the Circle Developer Terms of Service available at console.circle.com/legal/developer-terms.