Free · No signup · Local dev

Mock LLM APIs
for your tests.

Tenant-scoped OpenAI and Anthropic-compatible endpoints, chaos injection, and MCP support. No API key. No rate limits. Just HTTP.

01

Pick a tenant

Each tenant has its own mock state and scenario library. Pass X-Tenant-ID in every request.

02

Send a message

Use /v1/chat/completions (OpenAI) or /v1/messages (Anthropic), or send MCP JSON-RPC to /mcp/message.

03

Get mock data

Responses stream token-by-token from a scenario matched by keyword. Inject chaos to simulate errors or latency.

Docs

Routes & Guide

Full endpoint reference for LLM, MCP, admin, and chaos APIs — plus quick-start code samples.

View routes →
Tool

Playground

Interactive dashboard — manage tenants, scenarios, MCP tools, chaos profiles, and fire live requests.

Open playground →