Circle Agent Stack for AI agents: USDC wallets, spend policies, transfers, and x402 nanopayments.
Connect Runs on your machine
claude mcp add circle-agent-stack-mcp -e CIRCLE_API_KEY=<CIRCLE_API_KEY> -- npx -y [email protected]
{
"mcpServers": {
"circle-agent-stack-mcp": {
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"CIRCLE_API_KEY": "<CIRCLE_API_KEY>"
}
}
}
}
{
"mcpServers": {
"circle-agent-stack-mcp": {
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"CIRCLE_API_KEY": "<CIRCLE_API_KEY>"
}
}
}
}
{
"servers": {
"circle-agent-stack-mcp": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"CIRCLE_API_KEY": "<CIRCLE_API_KEY>"
}
}
}
}
Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server runs locally, so its tools are listed by your MCP client once it starts.
Environment variables
| Name | Description |
|---|---|
CIRCLE_API_KEYRequired, secret | Your Circle API key from developers.circle.com |
Details
| Package | [email protected] (NPM, stdio) |
| First published | 31 May 2026 |
| Last updated | 31 May 2026 |
| Registry name | io.github.kinance/circle-agent-stack-mcp |
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