Do clips have a watermark?

No. Every clip is a paid purchase and no clip carries a watermark, even on the $1 single-clip tier.

How much does a clip or a story cost?

A single 5s 540x960 clip is $1 (12 credits). A story costs $1 per 5s of the length you choose, up to 60s, with the storyboard and total shown before paying.

Why are my clips silent?

The model outputs video only. There is no voice, music, or sound generation, so you add audio in post.

Which model renders the clips?

An open-weights video model running on RunPod GPUs. Clips are not routed to a third-party video API like Kling or Runway.

How does the API work?

POST a prompt to /api/videos/generate/ with a bearer key, get back an id and status, then poll or receive a webhook with the MP4. An MCP server at sisif.ai/mcp lets agents pay per call via Stripe MPP.

What happens if a render fails or I run out of credits?

Failed renders return the credits. If you run out, buy another clip for $1 or move to a monthly plan; unused credits roll over and never expire.

Directory/Video Generation/AI Video Generators/Sisif

Sisif

Sisif is a pay-per-clip text-to-video generator: type a prompt and get a 5-second MP4 (540x960 portrait, 720x1280 on the ultra tier) in 2-5 minutes for $1. No watermark, credits never expire, failed renders are refunded, and commercial use is included. No subscription required. It also does image-to-video (animate photos, product ads, logo intros), and Story mode plans a brief into a shot-by-shot storyboard up to 60 seconds at $1 per 5 seconds. Clips are rendered on Sisif's own RunPod GPUs using an open-weights video model — not a third-party video API. Output is silent, with no voice or audio. Developers get a REST API, an MCP server with pay-per-call over Stripe's MPP (no key setup, nothing recurring), webhooks, and an n8n template. Aimed at Shopify stores, small shops, social media marketers, and devs who need cheap silent clips for TikTok, Reels, and Shorts.

Video Generation

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Added on

Nov 4, 2026

Text to videoNo watermarkRunPod GPUsREST APIMCP server5s clipsStoryboardsWebhooks

Product information

Everything worth knowing about Sisif

The complete picture — from everyday features to the technical detail builders and IT folks dig for.

Core features

What it actually does

Text-to-Video Rendering

Type a prompt and get a 5-second MP4 clip at 540x960 portrait. Most renders finish in 2-5 minutes and land in your library, your inbox, or a webhook.

Photo & Product Animation

Turn a single still into motion: product photos become ad clips, clothing shots become Shopify listings, logos become intros, and old or family photos get a short, subtle movement.

No Watermark, No Expiry

Every clip is watermark-free regardless of plan, credits never expire, failed renders get refunded to your balance, and commercial use is included.

Story Planning with Storyboards

For briefs longer than one shot, Sisif plans your idea into a storyboard of up to 60 seconds, shows you the shots and the total price, then renders after you approve.

Technical capabilities

Open-Weights Model on RunPod GPUs

Clips are rendered on Sisif's own RunPod GPU infrastructure using an open-weights video model. Prompts and outputs are not sent to a third-party video API.

REST API + MCP Server

POST a prompt with a Bearer token, poll for the file. The MCP endpoint at sisif.ai/mcp lets an agent order and pay for a clip in a single call via Stripe's Machine Payments Protocol — no API key provisioning or recurring contract.

Webhooks & n8n Automation

Render-complete events fire to your webhook, and published n8n templates (e.g. workflow #5452) chain the API into automated social video pipelines.

Must watch videos

Who uses it

Real use cases, no hype

Product Ads

Turn one product photo into a short ad clip

Photo Animation

Animate old, family, wedding, or memorial photos

Social Clips

Portrait clips for TikTok, Reels, and Shorts

Logo Intros

Convert a static logo into a short animated intro

Faceless Channels

Generate clips with no on-camera talent

Kids Cartoons

Render one cartoon scene from a text prompt

API Automation

Trigger renders from code, MCP, or n8n

What's great

No watermark on any clip, ever
Flat $1 per 5s clip, credits never expire
Failed renders get credits refunded
Commercial use included, no subscription required

Technical strengths

MCP server with pay-per-call via Stripe MPP
Rendered in-house on RunPod GPUs, not a third-party video API
Async REST API with webhooks and n8n template

Where it falls short

No free trial, 0 credits on signup
Clips are silent, no audio or voice
Low resolution: 540x960 default, 720x1280 max
Only 5s clips, longer needs a storyboard

Technical limitations

No video preview before you pay for a single clip
Open-weights model on RunPod caps quality vs frontier models
Credit math is opaque: 12 credits per 5s clip

For technical folks

The deep-dive specs

Model

Open-weights video model (no third-party video API)

Infrastructure

Self-hosted rendering on RunPod GPUs

Output Resolution

540x960 standard; 720x1280 on the ultra tier

Clip Duration

5 seconds per clip; stories up to 60 seconds

Render Time

Typically 2-5 minutes

Credit Cost

12 credits per 5-second 540x960 clip

API Auth

Bearer token (sk_live_...)

Payment Protocol

Stripe MPP one-time payments for agent calls

FAQ

Includes technical Q&A

No trial. New accounts start with 0 credits, so the first render is a purchase. You can plan 3 storyboards in 24 hours before paying and 10 after your first purchase.