> ## Documentation Index
> Fetch the complete documentation index at: https://docs.nasiko.com/llms.txt
> Use this file to discover all available pages before exploring further.

# LLM router API

> OpenAI-, Anthropic-, and Gemini-compatible endpoints the Nasiko LLM router serves.

Not in the generated OpenAPI spec. Agents and coding harnesses call these on the Nasiko server, not on the vendor.

Auth: agent JWT (`Authorization: Bearer` or `x-api-key`). User/session: W3C `traceparent` whose trace ID is a live flow. Missing or unresolvable `traceparent` → **403**. Empty `AGENT_JWT_SECRET` → **401**. See [Providers](/models/providers) and [Cost attribution](/tokenops/attribution).

| Method | Path | Protocol |
| - | - | - |
| `GET` | `/v1/health` | Liveness, no auth |
| `POST` | `/v1/chat/completions` | OpenAI Chat Completions |
| `POST` | `/v1/responses` | OpenAI Responses (Codex) |
| `POST` | `/v1/messages` | Anthropic Messages (Claude Code) |
| `POST` | `/v1beta/models/{model_method}` | Gemini generate / stream |
| `POST` | `/v1/embeddings` | Embeddings (same attribution rule) |
| `GET` | `/v1/models` | List models |

Library management (in the generated spec): `/api/llm-configs`, `/api/agents/{id}/llm-config`, `/api/agents/{id}/llm-token`, `/api/llm-router/providers`, `/api/model-registry`, `/api/custom-providers`.