circle

Circle Skills

Ship stablecoin apps faster with Circle Skills: best-practice guidance for USDC payments, crosschain transfers, wallets, and smart contracts, plus Circle's MCP server for real-time SDK and documentation context.

Installation

Claude Code

/plugin marketplace add circlefin/skills
/plugin install circle-skills@circle

Vercel Skills CLI

npx skills add circlefin/skills

Skills

Skill	Description
use-usdc	Interact with USDC on EVM chains and Solana. Check balances, send transfers, approve spending, and verify transactions.
bridge-stablecoin	Crosschain USDC transfers using CCTP (Crosschain Transfer Protocol). Includes UX patterns, progress tracking, and Bridge Kit SDK implementation.
use-arc	Build on Arc, Circle's blockchain where USDC is the native gas token. Covers chain configuration, contract deployment, and bridging USDC to Arc via CCTP.
use-circle-wallets	Choose the right Circle wallet type. Compares developer-controlled, user-controlled, and modular (passkey) wallets across custody model, key management, and use cases.
use-developer-controlled-wallets	Developer-controlled wallets for custodial flows like payouts, treasury management, and automation. Developers manage wallet creation and key storage.
use-gateway	Unified USDC balance across chains with instant crosschain transfers (<500ms). Supports EVM and Solana with deposit, balance query, and transfer workflows.
use-modular-wallets	Smart contract wallets with passkey authentication, gasless transactions, and modular architecture. Supports ERC-4337 account abstraction.
use-smart-contract-platform	Deploy, import, interact with, and monitor smart contracts using Circle's Smart Contract Platform. Supports bytecode deployment, template contracts (ERC-20/721/1155), ABI-based read/write calls, and event monitoring.
use-user-controlled-wallets	Embedded wallets where users control their own assets. Supports Web2-like login (Google, Facebook, Apple, email OTP, PIN) without seed phrases.

Circle MCP

Skills contain stable patterns (architecture decisions, UX guidance, common mistakes). For ground-truth details that change frequently (e.g., SDK method signatures, contract addresses, chain IDs) use Circle's MCP server alongside skills.

Client	Setup
Cursor	Add to ~/.cursor/mcp.json
Claude Code	claude mcp add --transport http circle https://api.circle.com/v1/codegen/mcp --scope user
Codex	codex mcp add circle --url https://api.circle.com/v1/codegen/mcp
Windsurf	Add to ~/.codeium/windsurf/mcp_config.json

Manual config for Cursor, Windsurf, and other JSON-based clients:

{
 "mcpServers": {
   "circle": {
     "url": "https://api.circle.com/v1/codegen/mcp"
   }
 }
}

Full setup guide: developers.circle.com/ai/mcp