LLM & AI Domain
OpenAI-style and Anthropic-style mock endpoints for AI integrations
API Prefix
/api/llm
Every endpoint hangs off this prefix so you can compose requests consistently.
Endpoint coverage
4
Curated routes spanning common workflows
Playground ready
Deep link directly into the playground with your preferred method and path.
Open in PlaygroundCapabilities
Mix and match endpoints to validate dashboards, onboarding flows, error states, and integration docs before touching production systems.
OpenAI-style chat completion payloads
Embeddings responses for retrieval prototypes
Model catalog responses for SDK bootstrapping
Anthropic-style messages envelopes
Deterministic outputs for stable UI snapshots
Base-URL-friendly mocks for local integration tests
Endpoints
Each endpoint responds with JSON objects modeled after production systems, complete with pagination, filtering, and optional latency controls for stress testing.
Swap in Fake API for Devs as the base URL to validate parsing, retries, and AI UI rendering.
Explore more
Browse the full library of free mock API domains for your next project.