circle

circle is an MCP server for Claude Code, Codex, Cursor, Gemini CLI, OpenCode from kinance/circle-agent-stack-mcp. Its token cost is not measured, scanned A, original, MIT.

A local MCP server for managing Circle wallets, sending USDC, and making x402 nanopayments, which are small payments requested through web-service calls.

In plain words
What is it for?
Use it for wallet operations, USDC transfers, and x402 payments from an MCP-compatible agent.
Why use it?
It gives an AI coding agent access to these payment-related actions through tool calls, provided a Circle API key is configured.

MCP server for Claude CodeCodexCursorGemini CLIOpenCode

Written for no agent in particular: it speaks MCP, so any client can run it. Also seen: listed in a Claude config.

Good fit Use it for wallet operations, USDC transfers, and x402 payments from an MCP-compatible agent.

Compare 6 mcp servers from other repositories ↓
Install with agentmods
npx agentmods add mcp/kinance/circle-agent-stack-mcp/circle
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/kinance/circle-agent-stack-mcp

Made for: Claude Code, Codex, Cursor, Gemini CLI, OpenCode.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for circle

README.md
[![agentmods](https://agentmods.dev/badge/mcp/kinance/circle-agent-stack-mcp/circle/github.svg)](https://agentmods.dev/mcp/kinance/circle-agent-stack-mcp/circle)
Your own site
<a href="https://agentmods.dev/mcp/kinance/circle-agent-stack-mcp/circle"><img src="https://agentmods.dev/badge/mcp/kinance/circle-agent-stack-mcp/circle/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for circle

Your own site · 80×15
<a href="https://agentmods.dev/mcp/kinance/circle-agent-stack-mcp/circle"><img src="https://agentmods.dev/badge/mcp/kinance/circle-agent-stack-mcp/circle.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session not measured What this adds to a session before it is invoked.
When invoked not measured Not applicable: nothing here is loaded into a session.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Security

Grade A, and why

circle scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

examples/.mcp.json · 12 lines

What it actually says

{
  "circle": {
    "command": "npx",
    "args": [
      "-y",
      "circle-agent-stack-mcp"
    ],
    "env": {
      "CIRCLE_API_KEY": "YOUR_CIRCLE_API_KEY"
    }
  }
}
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 1mo ago First seen · 12 lines scan A 4ac80ad6e07e

Subscribe to this mod's changes

circle is an MCP server published in the GitHub repository kinance/circle-agent-stack-mcp (1 stars, last pushed 4mo ago), licensed MIT. Its token cost is not measured: an MCP server costs its tool schemas, not its config file. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Related

Other mcp servers, from other repositories

mcp-mercado-bitcoin

MCP server for Mercado Bitcoin — Brazilian crypto exchange, trading, orderbook, withdrawals. Runs locally from the @codespar/mcp-mercado-bitcoin npm package. Needs 1 environment variable to run.

codespar/mcp-dev-latam · not measured

mintclub

Trade bonding curve tokens on Base via Mint Club V2 — buy, sell, swap, create. Runs locally from the mintclub-mcp npm package. Needs 1 environment variable to run.

Steemhunt/mint.club-v2-ai · not measured

sap-mcp

Solana-native MCP gateway for SAP, DeFi tools, SNS identity, and x402 payments. Runs locally from the @oobe-protocol-labs/sap-mcp-server npm package. Needs 2 environment variables to run.

OOBE-PROTOCOL/sap-mcp · not measured

keel-trade

Keel — CLI and MCP server for building and backtesting Hyperliquid strategies with your AI assistant. Runs locally from the keel-trade Python package.

keel-trade/keel-trade · not measured

oddsrail

MCP server giving AI trading agents access to prediction markets (Polymarket, Kalshi) with on-chain builder-code attribution and trading signals. Runs locally from the oddsrail Python package. Needs 1 environment variable to run.

hmesutozsoy/oddsrail · not measured

kainext-binance-mcp

MCP server for Binance spot: read market data, analyze, and propose real-money trades behind a human-gated confirmer. The model never holds a trade key. Runs locally from the kainext-binance-mcp Python package. Needs 3 environment variables to run.

Alejandrehl/kainext-binance-mcp · not measured