One API. Every model. Built for agent loops.
Layer X1 is a model API built for agents: point your tool at a single endpoint, authenticate with one key, and reach the entire lx1 model catalog through the protocols your stack already speaks.
What is Layer X1
Layer X1 serves its own catalog of lx1- models through a single gateway that is wire-compatible with the Anthropic Messages API, the OpenAI Chat Completions API, and the OpenAI Responses API. Swap your base URL and key; keep the rest of your stack exactly as it is.
What you get on the other side of that swap:
- The whole catalog, one key — from fast, near-free small models to premium reasoning and vision, all included on every plan. See Models.
- Every protocol your tools speak — Messages, Chat Completions, Responses, legacy Completions, embeddings, and batches, with streaming on every chat surface.
- Sessions that keep moving— if a model can't answer, the engine keeps your session moving. See Reliability.
- Predictable plans — a monthly pool of included usage measured in dollars at public list rates, with published rate limits. See Plans & limits.
Base URL
The gateway lives at a single origin. Every endpoint is served under /v1.
https://api.layerx1.inAPI keys are created in the dashboard and are prefixed lx1_. The Anthropic-style endpoints accept the key as x-api-key; the OpenAI-style endpoints accept it as a bearer token. See Authentication for the details.
curl https://api.layerx1.in/v1/messages \
-H "x-api-key: lx1_your_key" \
-H "content-type: application/json" \
-d '{"model":"lx1-gpt-oss-120b","max_tokens":256,"messages":[{"role":"user","content":"Hello"}]}'