Building an Autonomous On-Chain Agent with Coinbase AgentKit & Base

Learn how to give any LLM agent (LangChain / OpenAI / Claude) a self-custodial smart wallet on Base with automatic gas sponsorship, token swaps, and contract deployment.

Prerequisites

• Node.js 18+ or Python 3.10+
• Coinbase Developer Platform (CDP) API Key
• OpenAI or Anthropic API Key

Step 1: Install Dependencies

Install the official Coinbase AgentKit packages along with your preferred agent framework (LangChain or OpenAI SDK).

Step 2: Configure Environment Variables

Store your CDP API credentials and LLM keys securely. Never hardcode private keys into agent repositories.

Step 3: Initialize the Agent Wallet & Action Providers

Instantiate the CDP Wallet Provider. This creates a secure MPC wallet associated with your API key that can sign transactions automatically.

Step 4: Execute Autonomous Natural Language Tasks

Send autonomous instructions to the agent. The LLM will autonomously plan tool invocations, check gas, sign the payload, and return on-chain transaction hashes.

Key Takeaway

You now have an autonomous agent capable of executing multi-step on-chain operations on Base with zero human intervention, full key isolation, and verifiable transaction logs.

More Crypto Agent Tutorials

• Implementing HTTP 402 Micropayments for Agent-to-Agent APIs — Set up an HTTP 402 Payment Required paywall that accepts instant USDC payments from autonomous AI bots without requiring credit card subscriptions or manual API key generation.
• Configuring ERC-4337 Smart Accounts with Bounded Session Keys — Set up an enterprise-grade ERC-4337 Smart Account with fine-grained session key policies restricting autonomous bot spend, allowed contract targets, and expiration timestamps.
• Building a Verifiable DePIN Research Agent with ElizaOS — Deploy an autonomous market intelligence agent on ElizaOS that queries decentralized DePIN nodes, computes cryptographic market signals, and publishes attestations on-chain.