MCP server for Circle Agent Stack — wallet management, USDC transfers, and x402 nanopayments via tool calls
Setup
Choose your client, copy the config, then fill in any required environment variables.
claude mcp add circle-agent-stack --env CIRCLE_API_KEY='<CIRCLE_API_KEY>' -- npx -y circle-agent-stack-mcp~/.codex/config.toml
[mcp_servers.circle-agent-stack]
command = "npx"
args = ["-y", "circle-agent-stack-mcp"]
env = { CIRCLE_API_KEY = "<CIRCLE_API_KEY>" }
# codex mcp add circle-agent-stack --env CIRCLE_API_KEY='<CIRCLE_API_KEY>' -- npx -y circle-agent-stack-mcp~/.cursor/mcp.json
{
"mcpServers": {
"circle-agent-stack": {
"command": "npx",
"args": [
"-y",
"circle-agent-stack-mcp"
],
"env": {
"CIRCLE_API_KEY": "<CIRCLE_API_KEY>"
}
}
}
}.vscode/mcp.json
{
"servers": {
"circle-agent-stack": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"circle-agent-stack-mcp"
],
"env": {
"CIRCLE_API_KEY": "<CIRCLE_API_KEY>"
}
}
}
}~/.gemini/settings.json
{
"mcpServers": {
"circle-agent-stack": {
"command": "npx",
"args": [
"-y",
"circle-agent-stack-mcp"
],
"env": {
"CIRCLE_API_KEY": "<CIRCLE_API_KEY>"
}
}
}
}claude_desktop_config.json
{
"mcpServers": {
"circle-agent-stack": {
"command": "npx",
"args": [
"-y",
"circle-agent-stack-mcp"
],
"env": {
"CIRCLE_API_KEY": "<CIRCLE_API_KEY>"
}
}
}
}.trae/mcp.json
{
"mcpServers": {
"circle-agent-stack": {
"command": "npx",
"args": [
"-y",
"circle-agent-stack-mcp"
],
"env": {
"CIRCLE_API_KEY": "<CIRCLE_API_KEY>"
}
}
}
}Environment variables
CIRCLE_API_KEY
Replace the placeholders with your own credentials and keep them out of version control.