Circle Agent Stack Mcp
Give coding agents programmatic USDC wallets, spend limits, transfers, and x402 nanopayments through Circle’s Agent Stack via MCP.
Overview
circle-agent-stack-mcp is an MCP server for the Build phase that lets agents manage Circle USDC wallets, enforce spend policies, send transfers, and use x402 nanopayments.
What is this MCP server?
- USDC wallet operations for AI agents via stdio MCP (npm package circle-agent-stack-mcp)
- Spend policies to cap autonomous agent spending
- Transfers and programmable money movement from the agent session
- x402 nanopayment support for machine-to-machine micropayments
- Requires CIRCLE_API_KEY from developers.circle.com
- Package version 0.1.1 with stdio transport via npm identifier circle-agent-stack-mcp
- One required secret environment variable: CIRCLE_API_KEY
What problem does it solve?
Your agent can call APIs but cannot safely hold or spend money with guardrails, so paid autonomous workflows stay mocked or manual.
Who is it for?
Builders creating agents that must pay for APIs, settle micropayments, or operate custodied USDC with explicit spend caps.
Skip if: Products with no stablecoin or Circle stack requirement, or teams unwilling to manage API keys and financial compliance.
What do I get? / Deliverables
After registration with a Circle API key, your agent can execute policy-bound USDC wallet actions and nanopayments from the MCP tool surface.
- Agent-callable wallet, transfer, and policy tools via MCP
- x402 nanopayment-capable agent payment path
- Documented Circle API integration for agent runtimes
Recommended MCP Servers
Journey fit
Primary shelf is Build integrations when you connect paid agent workflows; pricing experiments in Validate and paid feature gates in Grow are common follow-ons. integrations is the right subphase for third-party payment and wallet APIs wired into your agent stack.
How it compares
Payments and wallet MCP integration, not a generic Stripe checkout skill or internal doc RAG.
Common Questions / FAQ
Who is circle-agent-stack-mcp for?
Indie developers and small teams building AI agents that need real USDC wallets, transfers, and spend policies through Circle’s Agent Stack.
When should I use circle-agent-stack-mcp?
Use it during Build when integrating agent payments, x402 nanopayments, or policy-limited spending—not for offline product research alone.
How do I add circle-agent-stack-mcp to my agent?
Install the npm package circle-agent-stack-mcp, set CIRCLE_API_KEY in your MCP server environment, and add the stdio server block to Claude Code, Cursor, or your MCP host config.