MCP Stack

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4.8Trustpilot · 24 reviews200+ developers
Production MCP for SaaS APIs

Ship MCP servers to production.

The OAuth, identity, runtime, and observability layer between your API and AI agents. Generated from your OpenAPI spec.

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mcpstack

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“We had a working agent inside our app in less than an hour.”Ross Slaney·CTO, ChecklistSquad

No MCP runtime to ship — just your OpenAPI.

No service accounts — OAuth 2.1, real users.

No agent code in your API — keep it pure REST.

Global edge MCP

One CLI deploy. Endpoints live near every agent.

Multi-region runtime with regional health, gateway routing, and tool-call telemetry — out of the box.

$mcpstack deploy openapi.yamlLive
Deploy your API

Per-user identity, baked in

Every tool call carries the signed-in user.

No shared service accounts. No identity bypass. The agent hits your API with the signed-in user's own token — right scopes, real audit trail, nothing new to wire in your backend.

A live MCP endpoint with OAuth 2.1, named users with per-user budgets, regional health, and an embedded agent calling tools as the signed-in user.
“Our ask was simple: let agents call our API as the actual signed-in user — same scopes, same audit trail, no service accounts. MCP Stack made it simple and integrated into our existing application and OAuth infrastructure.”
— Backend lead, Series A SaaSTrustpilot
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@emcy/agent-sdk

One component. The user's identity comes with it.

Forget WebSockets, streaming, retries, and refreshing tokens mid-tool-call. Pass your signed-in user, render <EmcyChat />. The OAuth flow above runs underneath — automatically.

$npm install @emcy/agent-sdk
App.tsx
import { EmcyChat } from "@emcy/agent-sdk/react-embed";

<EmcyChat
  agentId="ag_invoices"
  apiKey={process.env.EMCY_KEY}
  userIdentity={{
    subject: user.id,
    email: user.email,
  }}
/>
Get an API keyView on GitHub
Embedded AI assistant workspace using invoice tools with user context and trace information
“Drop-in chat that knows who the user is. That was the whole ask.”
— Eng manager, Property techTrustpilot

Simple, usage-based

Deploy MCP Servers with OAuth in minutes.

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Trial

14 days

$0

  • 1 hosted MCP server
  • 1,000 tool calls
  • 30s max tool call
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Most popular

Developer

/ month

Live

$49 / month

  • 1 hosted MCP server
  • 10,000 tool calls included
  • 30s max tool call
  • $2 per 1,000 additional tool calls
Start for free

Team

/ month

$199 / month

  • Unlimited hosted MCP servers
  • 100,000 tool calls included
  • 60s max tool call
  • $2 per 1,000 additional tool calls
Talk to a founder
Production-ready

Your API. Their agents. Live in under a minute.

Free for 14 days. No credit card. Direct line to founders if you need it.

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