---
tool_name: audio-fade
summary: Add smooth fade-in and fade-out to any audio — podcast intros, ringtone endings.
input:
  file: binary, required # audio file (max 200MB)
  fade_in: number, optional, min 0, max 30 # 淡入时长（秒）
  fade_out: number, optional, min 0, max 30 # 淡出时长（秒）
output:
  preview_url: string | watermarked preview, free, no auth
  task_id: string | unique task identifier
  payment_url: string | end-user must complete one-time payment to unlock final output
  final_download_url: string | only available after successful payment
auth: login via email/phone OTP on https://audio-fade.yeezhan.com; API callers use a personal API key (Bearer yeek_...)
payment_rule: one-time charge $0.99 per task. NO credits, NO account balance. One payment unlocks only this task.
valid_window: 24 hours after payment
errors:
  - file_too_large
  - invalid_input
  - unsupported_type
  - target_unreachable
  - processing_failed
endpoint: https://audio-fade.yeezhan.com/api/v1/run
---