检查 API 密钥

使用 API 密钥查询账户余额、额度和使用统计，无需登录。

Gọi bằng API key

Header Authorization: Bearer hoặc x-api-key. Không đưa key lên URL.

curl -sS https://apivn.dev/api/public/key-status \
  -H "Authorization: Bearer sk-..."
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