Free AI APIs — Zero-Cost Endpoints on Muapi
Live5 modelsMost generation models on Muapi are pay-per-use, but a handful of endpoints genuinely cost $0.00 per call: local watermarking utilities, Gemini Omni's voice-profile and character-creation companions, and Suno's voice cloning during its preview period. Same API key, same unified REST pattern — these five just don't bill anything.
Add Image Watermark
Add a custom watermark to an image with adjustable position, opacity, and size. Runs as free local processing (PIL) — no per-call charge.
Add Video Watermark
Add a custom watermark to a video with adjustable position, opacity, and size. Runs as free local processing (FFmpeg) — no per-call charge.
Gemini Omni Audio Profile
Create a named voice profile with custom timbre, style, and emotion. The returned voice ID plugs into Gemini Omni video generation for a consistent character voice.
Gemini Omni Character Creation
Generate a reusable character from a single reference image and text description, optionally attaching a Gemini Omni Audio voice profile for a consistent voice.
Suno Custom Voice Cloning
Clone a singing voice in two takes (10-second sample plus a liveness-check readback) for use as a vocal persona in Suno music generation. Free during preview.
Which Muapi Endpoints Are Actually Free?
Muapi's pricing data lists a static cost per model, but most $0 entries are stale or conditional — Muapi's LLM endpoints and several video/image models bill per token or per request through a separate calculation once you send a real request, even where the listed price looks like zero. This page only includes endpoints that are unconditionally free: no minimum charge, no per-token billing, nothing.
That leaves five genuinely free endpoints today: two local watermarking utilities, two Gemini Omni companion tools (voice profile and character creation), and Suno's voice cloning, which is free only during its current preview period and may become paid later.
Free Endpoint Comparison
| Model | Provider | Free Status | What It Does |
|---|---|---|---|
| Add Image Watermark | Muapi | Permanently free | Local PIL processing, no model inference |
| Add Video Watermark | Muapi | Permanently free | Local FFmpeg processing, no model inference |
| Gemini Omni Audio Profile | Permanently free | Companion utility for Gemini Omni video generation | |
| Gemini Omni Character Creation | Permanently free | Companion utility for Gemini Omni video generation | |
| Suno Custom Voice Cloning | Suno | Free during preview | Voice cloning for Suno music generation |
The watermarking and Gemini Omni companion tools have no announced end date for free access. Suno Custom Voice Cloning is explicitly preview-priced and may move to paid billing in the future — check the model's pricing at request time.
How to Call a Free Endpoint
- Pick an endpoint — watermarking, Gemini Omni voice/character profiles, or Suno voice cloning.
- Submit the request —
POST /api/v1/{model-slug}with the required inputs (image/video URL, prompt, or voice sample). - Poll for completion — check
GET /api/v1/predictions/{request_id}/resultuntilstatusiscompleted. - No credit deduction — these calls don't draw down your wallet balance, so you can iterate without cost.
Frequently Asked Questions
Are these endpoints really free forever?
The watermarking tools and Gemini Omni voice/character utilities have no announced pricing change. Suno Custom Voice Cloning is explicitly a preview-period offer and may become paid later.
Can I generate free images or videos on Muapi?
No — actual image, video, and most audio generation models are pay-per-use. The free tier covers watermarking utilities and two companion tools (voice profile, character creation) for Gemini Omni video generation, not standalone content generation.
Why are watermarking tools free?
They run as local processing (PIL for images, FFmpeg for video) rather than a paid third-party model API call, so there's no inference cost to pass through.
What can I do with a Gemini Omni voice profile or character?
Create a named voice ID or a reusable character once, then reference them in subsequent Gemini Omni video generation requests for a consistent voice or character across multiple videos.
Do I need an API key to use these?
Yes — the same Muapi API key you use for every other model. Free endpoints just don't deduct from your credit wallet.
Do free calls still need an API key and sign-up?
Yes. Sign up at muapi.ai and create an API key from your dashboard — the free endpoints work immediately, no waitlist or special approval required.