Free Text-to-Video API With No Key? What Exists and the Cheapest Real Option

Short answer: a text-to-video API that is free, needs no API key, and can be called from your code doesn't really exist. A few seconds of video take minutes of GPU time, and an open, unauthenticated endpoint would be drained within hours. So when a page promises a "free text to video API, no key required," it almost always means one of two things:

• A web tool. You open a site, type a prompt, and the clip renders in your browser. There's no key because there's no API: you can't script it or batch it.
• A free-credit API tier. A real endpoint with docs, but you sign up, get a key, and send it on every request. "Free" means the small trial credit; after that you pay.

We tested the image version of this question in Free AI Image Generation API, No Key Required: the no-key options hit watermarks, rate limits, or paywalls within minutes. Video compute is heavier, so the limits are stricter.

The three kinds of "free" and where each one stops

You want to…	Use	What you actually get
See whether a model is good enough, without code	A model's web app or free trial	Browser only; watermarks, resolution caps, or daily limits are common
Wire up an integration and test it	An API with free credits	A key is required; the credit is small, then pay as you go
Ship a product or commercial video	A pay-as-you-go API	A key on every call, per-second billing, no watermark

The pattern holds everywhere: the moment something can be called from code, it needs a key and it's metered. Free buys you a credit cap, a watermark, a lower resolution, or a daily limit, and those terms change often.

How far HiAPI's free credit goes

HiAPI also needs a key. What it removes is the friction: sign-up needs no card, new accounts get 200 credits ($0.10) that work on every model, and you top up only when you want more, with no subscription. Starter tasks in the dashboard add a few more credits.

What does $0.10 buy? On the lowest-cost text-to-video model, Grok Imagine at $0.015 per second at 480p, it covers one 6-second 480p clip ($0.09). Top-ups start at $5.

HiAPI's lowest-cost text-to-video options, from least to most expensive per second:

Model	Lowest rate	One clip	Notes
Grok Imagine grok-imagine/text-to-video	$0.015/s at 480p	6 s for $0.09	Lowest rate; good for testing many prompts
Seedance 2.0 Mini seedance-2.0-mini	$0.0272/s at 480p	5 s for $0.136	ByteDance's lightweight Seedance 2.0
PixVerse V6 pixverse-v6/text-to-video	$0.036/s at 360p, sound off	5 s for $0.18	Sound on costs more
Wan 3.0 wan3.0-video	$0.04/s at 480P	5 s for $0.20	Alibaba's newest Wan
Kling 2.5 Turbo kling-2.5-turbo/text-to-video	$0.06/s, about 1080p	5 s for $0.30	Cheapest route to 1080p (pricing)
Veo 3.1 Lite veo-3.1-lite/text-to-video	$0.06/s at 720p, no audio	4 s for $0.24	Google, 720p from the start
Kling 3.0 kling-3.0/text-to-video	$0.10/s at 720p	5 s for $0.50	Up to 4K, optional native sound
Wan 2.7 wan2.7-video/text-to-video	$0.10/s at 720P	5 s for $0.50	Alibaba, 2–15 s clips
Seedance 2.0 seedance-2.0	$0.136/s at 480p	5 s for $0.68	Up to 4K

HiAPI prices as of October 20, 2026, billed per second. Failed tasks aren't charged.

A practical loop: tune the prompt on Grok Imagine or Seedance 2.0 Mini at 480p, then render the keeper on a stronger model. Prompts carry over; check each model's parameters when you switch.

The cheapest clip, from the model page

Grok Imagine's model page example, 720p, 6 seconds:

A majestic tiger prowling through misty bamboo forest at golden hour, powerful muscular movement, cinematic

Generate with this prompt → (6 seconds, 16:9)

grok-imagine/text-to-video, 720p, 6 seconds, $0.1692; the same clip at 480p is $0.09.

Calling it from code

Video takes tens of seconds to minutes, so the API is asynchronous: submit a task, get a taskId, then fetch the result.

# 1. Submit: returns a taskId immediately
curl -X POST https://api.hiapi.ai/v1/tasks \
  -H "Authorization: Bearer $HIAPI_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "grok-imagine/text-to-video",
    "input": {
      "prompt": "A majestic tiger prowling through misty bamboo forest at golden hour, cinematic",
      "aspect_ratio": "16:9",
      "duration": 6,
      "resolution": "480p"
    }
  }'

# 2. Poll until status is success, then download output[0].url
curl https://api.hiapi.ai/v1/tasks/<taskId> \
  -H "Authorization: Bearer $HIAPI_KEY"

That's a 6-second 480p clip for $0.09. A few details:

• duration defaults to 6 seconds and aspect_ratio to 2:3 (portrait), so set 16:9 explicitly for landscape.
• output[0].url is temporary; download it and store it yourself.
• In production, use a callback instead of polling: add "callback": {"url": "https://your-app.example.com/hiapi/callback"}.

Every video model uses the same POST /v1/tasks endpoint; switching models means changing model and the fields in input. The full request format is in the create task docs.

FAQ

Is there a text-to-video API with no API key at all?

Not one you can rely on in a product. Anything callable from code authenticates; "no key" offers are either web tools with no API or the free credit of a keyed API.

Why are free image APIs easier to find than free video APIs?

Cost. An image takes seconds of compute; a few seconds of video take minutes of GPU time. Video gets smaller free credits, more watermarks, and stricter limits.

What do HiAPI's 200 sign-up credits buy?

200 credits are $0.10: one 6-second 480p Grok Imagine clip, or three 1K images on GPT Image 2 at $0.03 each.

How am I charged after the free credit?

Pay as you go, per second of video, with no subscription and no minimum. Failed tasks are free. See the pricing page.

To see the quality first, generate a clip on the Grok Imagine model page. For a full API integration walkthrough, see the Seedance 2.5 text-to-video API guide, and for every low-cost image and video model, the cheapest image and video APIs on HiAPI.