The Vibe Coder's Guide to Integrating External APIs with Base MCP

"Send 0.5 ETH to @vitalik on Farcaster."

No copying wallet addresses, no switching between apps, no confirming gas fees in a separate interface. Just a conversation followed by a real onchain action.

This is what Base MCP brings to the table – bridging the gap between conversation and action onchain.

On Twitter and Farcaster, AI agents like Bankr have gained popularity by providing conversational interfaces to onchain actions. They've demonstrated the value of removing technical barriers to blockchain interaction. So what makes Base MCP special?

Well, what makes MCP (Model Context Protocol) revolutionary is standardization.

Think of MCP as a universal adapter that allows any AI model to communicate with any data source or tool using the same language. This means:

• Developers don't have to reinvent the wheel when creating onchain interactions for AI
• New protocols can connect once and become instantly discoverable for all MCP clients
• Client developers (like those building AI assistants) can tap into a rich ecosystem of tools immediately

Imagine building the next Aethernet (the AI agent that made waves by minting NFTs on Farcaster). With MCP, your creation would be power-packed with all these blockchain functionalities from day one, without custom integrations for each capability.

Base MCP already provides powerful tools for interacting with the Base, but its true potential lies in what developers and vibe coders like you can add to it. By integrating external data sources and APIs, we can create a more connected and user-friendly onchain experience.

This guide will walk you through the process of extending Base MCP with new capabilities, focusing specifically on how to integrate the Neynar API to resolve Farcaster usernames to wallet addresses.