Craigslist Has No API. We Made an MCP Server Anyway.

The Problem: Craigslist Has No API

Craigslist deliberately offers no public API. No documentation, no developer program, no OAuth flow. If you want to build something on top of Craigslist data, your options have traditionally been fragile HTML scrapers that break every time they change a class name.

But Craigslist does have an API. They use it internally. Every time you load a page, your browser calls sapi.craigslist.org and gets back structured JSON. The endpoints exist, they just aren't documented.

How DataFaucet Found the Endpoints

DataFaucet launches a real browser, navigates to Craigslist, and intercepts all network traffic via Chrome DevTools Protocol. In about 30 seconds of browsing, it captured three data-carrying endpoints:

No authentication required. JSON responses. Parameters extracted from URL patterns.

The Generated MCP Server

From those 3 endpoints, DataFaucet generated a fully typed MCP server with:

• `search_listings` - Search by area, category (apartments, jobs, for-sale), with configurable result limit
• `get_listing_details` - Full details for any posting ID
• `list_areas` - All available cities/regions

// What your AI agent can now do:
"Find 2-bedroom apartments under $2000/mo in SF with parking"
"Show me remote software jobs posted today in the Bay Area"
"What furniture is for sale near me under $100?"

Try It Right Now

The Craigslist MCP server is deployed and running. Add it to Claude Code with one command:

claude mcp add craigslist-demo https://datafaucet.dev/api/mcp/demo-craigslist

Then ask Claude anything about Craigslist listings. It will call the tools automatically.

Why This Matters

Most real-world tools will never get an official MCP server. The company won't build one. The community hasn't built one. But the internal APIs already exist, because the web app uses them.

DataFaucet turns that hidden traffic into working MCP tools in under a minute. No scraping, no reverse engineering by hand, no maintenance burden when endpoints change (just re-scan).

What Else Can You Do This With?

Any site that loads data via JavaScript has an internal API. Some examples people have built with DataFaucet:

• Internal admin panels - CRMs, dashboards, tools with no public API
• SaaS products - Features that exist in the UI but not in the public API
• Government sites - Data portals that render server-side but fetch via AJAX

The pattern is the same: browse, capture, deploy. Try it yourself or build your own MCP server from any site.