An MCP server is the adapter that lets an AI agent actually use an API — it exposes a provider’s operations as tools an agent can discover and call over the Model Context Protocol, instead of forcing the agent to reverse-engineer REST endpoints and auth on its own. If you want agents to do real work against your service, an MCP server is how they get a safe, structured door in. APIs.io tracks these as a first-class artifact, and the coverage is now substantial.
Who publishes them
The mcp/_servers collection holds 1,779 MCP server entries spanning 1,753 providers in the catalog. That is not a handful of early adopters — it is close to the whole network carrying an MCP artifact, and 1,556 of those entries point at a hosted endpoint you can connect to directly.
The named servers read like a roll call of platforms betting on agents:
- Stripe — a remote server at
mcp.stripe.comthat exposes the Stripe API and knowledge base over OAuth or restricted API keys, withnpx @stripe/mcpfor local use. - GitHub — hosted at
api.githubcopilot.com/mcp. - Cloudflare — a containers MCP endpoint at
containers.mcp.cloudflare.com/mcp. - ServiceNow, Twilio, Notion, and Atlassian — each carrying their own server entry.
The mix matters: payments, source control, edge infrastructure, enterprise workflow, and communications are all represented, which means an agent assembling a real task can reach across categories through a consistent protocol.
What a good one looks like
Reading the entries side by side, the strong ones share a few traits. They publish a real, reachable endpoint and name their install method plainly — a hosted URL is the cleanest signal. They state their auth model up front: Stripe’s entry, for example, spells out OAuth or restricted API keys, which tells an agent operator exactly how much blast radius a connection carries. And they offer a local option (npx) alongside the hosted one, so you can test against the same tools before you wire an agent to production.
The weaker entries are the tell: an empty description, or an endpoint that resolves to a blog post announcing the server rather than the server itself. Those are providers who have talked about MCP more than they have shipped it — and the catalog makes that gap visible at a glance.
Takeaway
MCP servers have gone from novelty to near-default across the network. Browse the full set — endpoints, install methods, and the providers behind them — at the MCP servers directory on APIs.io, and use it to find which of the APIs you already depend on are ready for your agents today.