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Hosted MCP endpoint with realistic fake data for prototyping agents. 12 tools, no setup.
Hosted MCP endpoint with realistic fake data for prototyping agents. 12 tools, no setup.
Remote endpoints: streamable-http: https://mockmcp.io/mcp
MockMCP is a well-architected, purposeful MCP server for prototyping with realistic fake data. Code is clean with proper input validation via Zod, appropriate rate limiting (with Upstash Redis and in-memory fallback), and no credential leaks or malicious patterns. Permissions align with its role as a stateless demo service. Minor findings around error handling and input validation edge cases do not materially impact security. Supply chain analysis found 3 known vulnerabilities in dependencies (0 critical, 3 high severity).
7 files analyzed · 6 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
This plugin requests these system permissions. Most are normal for its category.
Available as Local & Remote
This plugin can run on your machine or connect to a hosted endpoint. during install.
From the project's GitHub README.
Hosted MCP endpoint returning realistic fake data for prototyping agents. Paste one URL, zero setup.
Live at mockmcp.io — https://mockmcp.io/mcp
Built for devs who want to prototype agent workflows without wiring up a backend, writing fixtures, or standing up a local MCP server. 12 pre-built tools covering the scenarios in most agent tutorials.
# Initialize a session and get back a session id
curl -i -X POST https://mockmcp.io/mcp \
-H "Content-Type: application/json" \
-H "Accept: application/json, text/event-stream" \
-d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-06-18","capabilities":{},"clientInfo":{"name":"curl","version":"0.1"}}}'
# Use the Mcp-Session-Id header in subsequent calls:
curl -X POST https://mockmcp.io/mcp \
-H "Content-Type: application/json" \
-H "Accept: application/json, text/event-stream" \
-H "Mcp-Session-Id: <paste-id-here>" \
-d '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"list_users","arguments":{"limit":3}}}'
Claude Code
claude mcp add --transport http mockmcp https://mockmcp.io/mcp
Cursor — add to ~/.cursor/mcp.json:
{
"mcpServers": {
"mockmcp": {
"url": "https://mockmcp.io/mcp"
}
}
}
Claude Desktop — Settings → Connectors → Add custom connector → paste https://mockmcp.io/mcp as the URL.
No mcp-remote proxy required. All three clients speak Streamable HTTP natively.
| Tool | What it does |
|---|---|
list_users | Paginated list of mock users |
get_user | One mock user by id or seed |
create_user | Create a mock user (no persistence) |
list_products | Paginated list of mock products |
get_product | One mock product |
list_orders | Mock orders with optional status filter |
get_order | One mock order |
create_order | Create a mock order (no persistence) |
list_events | Mock analytics events |
create_event | Record a mock event |
send_email | Returns fake success, nothing delivered |
search_knowledge_base | Mock KB search with ranked results |
All data is seeded from your inputs — same input, same output.
Free tier, per hashed IP + User-Agent fingerprint:
Hit the wall? Drop your email at mockmcp.io/waitlist for paid-tier access when it launches.
429 responses carry a structured JSON-RPC error with upgrade_url and retry_after_seconds. Every successful response carries X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, and X-RateLimit-Scope headers.
npm install
npm run dev
Server listens on http://localhost:3000. MCP endpoint at /mcp. Without Upstash env vars, rate limiting falls back to an in-memory store (per-process, fine for dev).
@modelcontextprotocol/sdk — MCP server + Streamable HTTP transporthttp — no framework overhead, clean shutdown@faker-js/faker — deterministic fake data via seeds@upstash/ratelimit + @upstash/redis — sliding-window rate limitingzod — tool input validationTargets Node 20+. Build + start are pinned via nixpacks.toml; health checks + restart policy via railway.json.
| Var | Notes |
|---|---|
UPSTASH_REDIS_REST_URL | From upstash.com free tier |
UPSTASH_REDIS_REST_TOKEN | Paired with the URL above |
PORT | Railway sets this automatically |
GET /health returns {"ok":true}. Railway pings this during deploy.
POST /api/waitlist logs a structured JSON line per signup:
{"event":"waitlist_signup","email":"alice@example.com","at":"2026-04-24T19:33:06.396Z"}
Grep them with railway logs | grep waitlist_signup. Storage-free by design — swap in Resend, a Tally forward, or a DB when the paid tier is live.
MIT — see LICENSE.
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