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Native Claude Format

Requests in Anthropic Claude Messages API format. Requires anthropic-version in the request header.

POST
/v1/messages

Authorization

BearerAuth

AuthorizationBearer <token>

Authenticate using a Bearer Token. Format: Authorization: Bearer sk-xxxxxx

In: header

Header Parameters

anthropic-version*string

Anthropic API version

x-api-key?string

Anthropic API Key (optional, can also use Bearer Token)

Request Body

application/json

model*string
messages*
system?string|
max_tokens*integer
Range1 <= value
temperature?number
Range0 <= value <= 1
top_p?number
top_k?integer
stream?boolean
stop_sequences?array<string>
tools?
tool_choice?
thinking?
metadata?

Response Body

application/json

curl -X POST "https://easyrouter.io/v1/messages" \  -H "anthropic-version: 2023-06-01" \  -H "Content-Type: application/json" \  -d '{    "model": "claude-sonnet-4-6",    "max_tokens": 1024,    "messages": [      {        "role": "user",        "content": "Hello, please introduce yourself."      }    ]  }'
{
  "id": "string",
  "type": "message",
  "role": "assistant",
  "content": [
    {
      "type": "string",
      "text": "string"
    }
  ],
  "model": "string",
  "stop_reason": "end_turn",
  "usage": {
    "input_tokens": 0,
    "output_tokens": 0,
    "cache_creation_input_tokens": 0,
    "cache_read_input_tokens": 0
  }
}