CIRCLE AGENT STACK

The financial stack for the AI-native 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.

Browse Agent Marketplace

Fund your agent

Works with

Claude

Codex

Cursor

Claws

+ Custom agents

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

Agent Stack is purpose-built for AI from the protocol up. It delivers the tools developers use 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 — stable, liquid, regulated¹, and programmable. With USDC, agents can move money 24/7, settling at near-zero cost and machine speed.

Multichain and multi-protocol

Agents 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

The financial primitives developers need to equip agents to hold assets, move value, and pay for services. Open by default, composable into any application.

FULL STACK FINANCE

One stack. End to end.

Agent Stack forms a complete economic loop. Build, command, and discover agentic financial building blocks. Programmatically hold, transfer, and settle USDC.

Agent Marketplace

A directory where agents discover, evaluate, and pay for services in USDC. Structured for machine reading and open for agentic participation.

Explore Marketplace

Agent Wallets

Programmable USDC wallets for agents, with global limits, per-service caps, contract or chain allowlists, and time-bounded sessions built in.

Explore Wallets

Circle Skills

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

Circle CLI

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

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

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."

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."

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.”

Improve socials

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

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.”

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."

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.”

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

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

Fund your agent

Browse Agent Marketplace

Have questions? Contact us

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

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.

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 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.

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.

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

Circle Technology Services, LLC (“CTS”) is a software provider and does not provide financial, advisory, or marketplace services. Agent Stack enables users and developers to interact with third-party applications and services, which are not controlled by Circle. Transactions initiated by agents are executed based on user-defined permissions and may occur without real-time human review. Circle does not guarantee the performance, availability, or outcomes of any third-party services or agent-initiated transactions. Users are solely responsible for their use of these tools and for evaluating associated risks.

For additional details, please see the Circle Developer terms of service, available at agents.circle.com/terms-of-use.