AgentKit Plugin

Coinbase AgentKit integration for autonomous agent wallets.

Overview

The MARC Protocol AgentKit plugin integrates with Coinbase's AgentKit framework, enabling autonomous agents to make encrypted payments using Coinbase-managed wallets. This is ideal for agents that need enterprise-grade key management without self-custody.

Package: @marc-protocol/agentkit-plugin

Installation

npm install @marc-protocol/agentkit-plugin @coinbase/agentkit

Setup

agent.tstypescript

import { CdpWalletProvider } from "@coinbase/agentkit";
import { MarcAgentKitPlugin } from "@marc-protocol/agentkit-plugin";

// Initialize Coinbase wallet
const walletProvider = await CdpWalletProvider.configureWithWallet({
  apiKeyName: process.env.CDP_API_KEY_NAME!,
  apiKeyPrivateKey: process.env.CDP_API_KEY_PRIVATE_KEY!,
  networkId: "ethereum-sepolia",
});

// Create MARC plugin
const marcPlugin = new MarcAgentKitPlugin({
  walletProvider,
  tokenAddress: "0xE944754aa70d4924dc5d8E57774CDf21Df5e592D",
  verifierAddress: "0x4503A7aee235aBD10e6064BBa8E14235fdF041f4",
});

// Get available actions
const actions = marcPlugin.getActions();
// Returns: marc_wrap, marc_unwrap, marc_transfer, marc_pay, marc_balance

Available Actions

Action	Description	Parameters
`marc_wrap`	Wrap USDC to cUSDC	amount, to (optional)
`marc_unwrap`	Unwrap cUSDC to USDC	amount, to (optional)
`marc_transfer`	Encrypted cUSDC transfer	to, amount
`marc_pay`	x402 payment (transfer + record)	to, amount
`marc_balance`	Check USDC and cUSDC balances	address (optional)

With LangChain

langchain-agent.tstypescript

import { AgentKit } from "@coinbase/agentkit";
import { getLangChainTools } from "@coinbase/agentkit-langchain";
import { MarcAgentKitPlugin } from "@marc-protocol/agentkit-plugin";

const agentKit = await AgentKit.from({
  walletProvider,
  actionProviders: [new MarcAgentKitPlugin({ walletProvider, ...config })],
});

const tools = getLangChainTools(agentKit);
// Use tools with LangChain agent executor

Virtuals GAME Plugin

For Virtuals Protocol GAME agents, MARC provides a separate plugin:

virtuals-agent.tstypescript

import { FhePlugin } from "@marc-protocol/virtuals-plugin";

const plugin = new FhePlugin({
  credentials: {
    privateKey: process.env.PRIVATE_KEY!,
    tokenAddress: "0xE944754aa70d4924dc5d8E57774CDf21Df5e592D",
    verifierAddress: "0x4503A7aee235aBD10e6064BBa8E14235fdF041f4",
    fhevmInstance,
  },
});

const worker = plugin.getWorker();
// 5 GameFunctions: fhe_wrap, fhe_pay, fhe_unwrap, fhe_balance, fhe_info

OpenClaw Skill

For OpenClaw agents, MARC provides 6 CLI scripts:

# Wrap USDC into cUSDC
npx tsx scripts/wrap.ts --amount 10

# Encrypted payment
npx tsx scripts/pay.ts --to 0x... --amount 1

# Unwrap (cUSDC → USDC)
npx tsx scripts/unwrap.ts --amount 5

# Check balance
npx tsx scripts/balance.ts

# Protocol info
npx tsx scripts/info.ts

Framework Comparison

Framework	Package	Tools	Tests
MCP (Claude/GPT)	`@marc-protocol/mcp-server`	6	Included
Coinbase AgentKit	`@marc-protocol/agentkit-plugin`	5	Included
Virtuals GAME	`@marc-protocol/virtuals-plugin`	5	37
OpenClaw	`@marc-protocol/openclaw-skill`	6	31
ElizaOS	Example in repo	3	Example

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