Create sandbox API key

Create a sandbox API key (sk_test_...) for local development, CI, and integration tests. Sandbox keys never charge credits. The plaintext secret is returned once and cannot be retrieved later. Live keys cannot be created from the API — create those at https://app.fiber.ai. First-time users without any key yet: sign up at https://fiber.ai or via POST /v1/account/send-otp + verify-otp.

<span>⚡ <strong>Rate limit:</strong> 30 requests per 1 minute</span>

<span>💰 <strong>Cost:</strong> FREE! No credits are charged for this API. <span title="Pricing shown is default pricing. Actual pricing may vary.">ⓘ</span></span>