MCP vs API vs inventory feed: what's the difference?
Dealers hear all three. A feed copies data on a schedule, an API answers developers, and an MCP server lets an AI agent use the tool directly. Here's when each one matters.
Ask three vendors whether they "work with AI" and you may hear three different answers: we send a feed, we have an API, we have an MCP server. They're not the same thing, and the difference decides what an AI agent can actually do for your store.
The short version
| Inventory feed | API | MCP server | |
|---|---|---|---|
| Who it's built for | Other systems, on a schedule | Developers | AI agents |
| Direction | One way, out | Both ways | Both ways |
| How fresh | As of the last export, often nightly | Live | Live |
| Needs custom code to use | Set up once per destination | Yes, for every integration | No, the agent reads what it can do |
| Example | A nightly file to a marketplace | A developer pulls today's leads | A shopper's agent asks "is this car still available?" |
Inventory feed
A feed is a file, usually exported once or a few times a day, that copies your vehicles to marketplaces, your website and ad platforms. It's reliable and every dealer has one. But it only goes one way and it's only as fresh as its last export. An agent reading a feed can tell a shopper what you had this morning. It can't check that the car is still there, hold a time or start a lead.
API
An API lets one system ask another for data or tell it to do something, live and in both directions. It's built for developers: someone reads the documentation, gets credentials, and writes code for each integration. Many dealer tools have one, though often partner-gated. A good API is the foundation everything else sits on.
MCP server
MCP, the Model Context Protocol, is a standard way for an AI agent to use software. An MCP server lists its tools ("search inventory", "create a lead", "list open service times") and describes each one, so ChatGPT, Claude, Gemini or a dealer's own agent can discover them and call them with no custom code. Most MCP servers are a thin layer on top of the vendor's existing API.
Which one does a dealer need?
All three, for different jobs:
- Keep the feed. Marketplaces and your website still depend on it.
- Ask for a documented API in your vendor contracts, with clear access terms and no surprise fees for your own data.
- Ask for an MCP server, or a documented API that a gateway can connect, if you want AI agents, your own or your shoppers', to do real work with that tool.
AutomotiveMCP counts both a secure, documented API and an MCP server as agent-ready. The directory shows which your vendors have today, and the category pages answer "which CRMs, DMSs and chat tools support MCP" in one line each.
Common questions
- What is the difference between MCP and an API?
- An API is built for developers: someone has to read its documentation and write code against it. An MCP server describes its own tools in a way an AI agent can read at run time, so ChatGPT, Claude or another agent can discover what it does and call it without custom code. Most MCP servers are a thin layer on top of an existing API.
- Does MCP replace my inventory feed?
- No. A feed still keeps marketplaces and your website stocked. MCP adds a live, two-way connection: an agent can ask whether a specific vehicle is still available right now, or schedule a test drive, which a nightly feed can't do.
- If my vendor has an API, do they also need an MCP server?
- Not strictly. A secure, documented API counts as agent-ready, because a developer or a gateway can put it in front of an agent. An MCP server removes that step, so any assistant can connect directly.