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API ReferenceAPI Reference

API Reference

Complete nRouter API reference: explore OpenAI and Anthropic compatible endpoints for chat completions, embeddings, audio, and intelligent multi-model routing.

nRouter exposes an OpenAI- and Anthropic-compatible API at https://api.nrouter.ai. Any SDK that talks to either provider works by changing the base URL and the key.

Try any endpoint from its page

Every endpoint page below carries a live request panel — set your key, send a real request, read the cost straight off the response headers.

Endpoints

15 of 15 endpoints
POSTOpenAI

Chat Completions

/v1/chat/completions

OpenAI-compatible chat completions, streamed or buffered, with guardrails and provider fallback.

Interactive SpecTry request
POSTAnthropic

Messages

/v1/messages

Anthropic-compatible Messages endpoint. Point the Anthropic SDK at nRouter by changing the base URL and key.

Interactive SpecTry request
POSTAnthropic

Count Tokens

/v1/messages/count_tokens

Count the input tokens of a Messages request before you send it.

Interactive SpecTry request
POSTOpenAI

Responses API

/v1/responses

The OpenAI Responses API wire, including tool use and multimodal input.

Interactive SpecTry request
POSTOpenAI

Text Completions

/v1/completions

Legacy text completions for single-turn prompt-and-response workflows.

Interactive SpecTry request
GETOpenAI

List Models

/v1/models

List the models available through nRouter, across every connected provider.

Interactive SpecTry request
GETOpenAI

Retrieve Model

/v1/models/{model_id}

Retrieve one model by its ID.

Interactive SpecTry request
POSTOpenAI

Embeddings

/v1/embeddings

Generate high-dimensional vector representations for semantic search, RAG, and classification.

Interactive SpecTry request
POSTOpenAI

Image Generations

/v1/images/generations

Generate visual assets using state-of-the-art diffusion and multimodal models.

Interactive SpecTry request
POSTOpenAI

Text to Speech

/v1/audio/speech

Transform text into natural lifelike spoken audio in multiple voices and formats.

Interactive SpecTry request
POSTOpenAI

Speech to Text

/v1/audio/transcriptions

Transcribe spoken audio into accurate text transcripts with timestamps and language detection.

Interactive SpecTry request
POSTOpenAI

Audio Translations

/v1/audio/translations

Translate non-English speech directly into English text transcripts.

Interactive SpecTry request
POSTREST

Start Video Job

/v1/videos

Initiate async video generation jobs. Billed once on initiation; polling and download are free.

Interactive SpecTry request
GETREST

Poll Video Job

/v1/videos/{id}

Check the processing status of an active video generation task (unmetered / free).

Interactive SpecTry request
GETREST

Download Video

/v1/videos/{id}/content

Download the completed video content file (unmetered / free).

Interactive SpecTry request

Video creation is billed; polling and download are not — you are charged once, when the job starts.

Authentication

Every request takes your virtual key as a bearer token:

curl https://api.nrouter.ai/v1/chat/completions \
  -H "Authorization: Bearer $NROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"gpt-5.5","messages":[{"role":"user","content":"Hello!"}]}'

Guides

Start with Chat Completions — streaming, function calling, and the request shape in full.

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Create a chat completion (streaming or not). POST

Create streaming and non-streaming chat completions using nRouter. OpenAI-compatible request format with automated fallbacks, guardrails, and cost headers.

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EndpointsAuthenticationGuides