32dots HEIDELBERG AI
Curriculum › v0 course › v0-09
Session 7 medium

Connect anything: APIs, integrations & MCP

LESSONLesson 7 · ~20 min

🎯Goal. Wire your app to outside services — third-party APIs, marketplace integrations, and MCP tools.

▶ Try this prompt

Show today's weather for the shop's city in the header, using a weather API.

Store the API key as an environment variable; your app code calls the service with it.

  1. 1External APIs: add keys under Project Menu ⋯ → Environment Variables, choosing which environment (Development / Preview / Production) each applies to — the preview only sees Development variables.
  2. 2Marketplace integrations: the same Integrations marketplace that adds databases and AI also connects other services, each adding its environment variables automatically.
  3. 3MCP: connect Model Context Protocol servers to give v0's agent extra tools — either bring your own MCP server (or a preset) or use MCP tools from installed Marketplace integrations.
v0 prompt-form menu showing Generate Images, Design System, Instructions, MCPs and Enhance Prompt
The prompt-form menu exposes MCPs (Model Context Protocol) alongside Design System and Instructions — connect external tools the agent can use. Source: v0.app/docs

✓You'll see. Your app calling a live external service, with keys kept in environment variables per environment.

💳Cost. You pay each external provider directly; building the feature spends normal messages.

💡Takeaway. Integrations are description-first — keys live in env vars, and MCP lets the agent reach your own tools and data.