Router One
Router One

Create Message

Create a Claude / Anthropic Messages compatible request. Use this for clients such as Claude Code that call the Messages API shape; streaming and non-streaming responses are supported.

POST
/v1/messages

Authorization

AuthorizationBearer <token>

Authenticate with your API Key. Get your API Key in the Router One console; the format is sk-xxx.

In: header

Request Body

modelstring

Model ID. Set to auto for Router One routing, or specify a concrete model.

messages

Conversation messages in the Claude / Anthropic Messages format.

Items1 <= items
system?string

Optional system prompt.

max_tokensinteger

Maximum number of output tokens.

Range1 <= value
stream?boolean

Whether to enable streaming response.

Defaultfalse
temperature?number

Sampling temperature, range 0-2.

Default1
Range0 <= value <= 2

Response Body

application/json

application/json

application/json

application/json

application/json

curl -X POST "https://api.router.one/v1/messages" \  -H "Content-Type: application/json" \  -d '{    "model": "auto",    "max_tokens": 1024,    "messages": [      {        "role": "user",        "content": "Hello"      }    ]  }'
{
  "id": "msg_abc123",
  "type": "message",
  "role": "assistant",
  "model": "claude-sonnet-4-20250514",
  "content": [
    {
      "type": "text",
      "text": "Hello! How can I help you?"
    }
  ],
  "stop_reason": "end_turn",
  "usage": {
    "input_tokens": 9,
    "output_tokens": 12
  }
}
{
  "error": {
    "message": "Invalid API key",
    "type": "authentication_error",
    "code": "invalid_api_key"
  }
}
{
  "error": {
    "message": "Insufficient balance",
    "type": "billing_error",
    "code": "insufficient_balance"
  }
}
{
  "error": {
    "message": "Rate limit exceeded",
    "type": "rate_limit_error",
    "code": "rate_limit_exceeded"
  }
}
{
  "error": {
    "message": "string",
    "type": "string",
    "code": "string"
  }
}