CloseRouter
Documentation

Connect through the API

Use a compatible SDK or an HTTP request in your application.

First request

Store your key in the CLOSEROUTER_API_KEY environment variable.

cURL
export CLOSEROUTER_API_KEY="closerouter_your_key"

curl https://api.closerouter.dev/v1/chat/completions \
  -H "Authorization: Bearer $CLOSEROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.4-mini",
    "messages": [
      { "role": "user", "content": "Reply with exactly: ok" }
    ],
    "max_tokens": 16
  }'

Result

Abbreviated response. Read the text from choices[0].message.content; the SDK examples print it.

JSON
{
  "choices": [
    {
      "message": {
        "role": "assistant",
        "content": "ok"
      }
    }
  ]
}

Reference