Leap API
Kling O3 Pro APIKuaishou's model, through Leap
Animates a first frame, to an optional last frame, with optional sound. One Leap key and one balance run it and every other model, priced per call in dollars.
First $5 top-up, no card fee.
- One key for every model
- Every call quoted first
- A failed call costs nothing
# Upload the image (PNG, JPEG or WebP, up to 4 MB) and keep its ID.FILE_ID=$(curl -s "https://api.tryleap.ai/v1/files?filename=photo.jpg" \ -H "x-api-key: $LEAP_API_KEY" \ -H "content-type: image/jpeg" \ --data-binary @photo.jpg | jq -r .id) # Then run the model with them.jq -n --arg first_frame "$FILE_ID" '{ "model": "kling/kling-o3-pro", "input": { "prompt": "A heron lands on a still lake at dawn", "duration": 5, "audio": false, "first_frame": $first_frame }}' \ | curl https://api.tryleap.ai/v1/generations \ -H "x-api-key: $LEAP_API_KEY" \ -H "content-type: application/json" \ -H "prefer: wait=60" \ -d @- # Video often outlasts the wait and answers "queued" or "running".# Put its "id" in GENERATION_ID and read it again until it is done:# curl https://api.tryleap.ai/v1/generations/$GENERATION_ID -H "x-api-key: $LEAP_API_KEY"Set LEAP_API_KEY and send it. It uploads your image first, since inputs take file IDs, not URLs. With prefer: wait=60 the answer holds the result when the call finishes within a minute; a longer one is read again by its ID.
- Model ID
- kling/kling-o3-pro
- Price per call
- $0.45 to $2.775
- This call
- A 5-second clip without sound costs $0.75.
- First top-up
- A first top-up of $5, with no fee, covers six calls like it.
What it makes
Made with Kling O3 Pro
Real Kling O3 Pro runs on Leap. Each one passed Leap's media quality check before it was shown.

“Hand-drawn 2D animation. A gust of wind lifts the white sheet into a big billow; the grandmother catches it, clips it with a wooden peg, then glances at her sleeping grandson and smiles; the crows lift off the power line and fly across the sky. Static camera, painted background, hand-drawn line art, animated on twos. Sound: wind snapping the sheet, crows cawing, a distant train bell.”

“He slides the margherita into the roaring oven on the long wooden peel; the flames flare up hard; within two seconds he pulls the same peel back out and the pizza on it is burnt completely pitch black and smoking, exactly as in the last frame; he holds it toward the camera and stares straight into the lens, totally deadpan. Handheld, slow push toward him. One continuous shot, no cuts. Sound: roaring fire, a sudden whoosh of flame, the scrape of the peel, a dry crackle. No text, no logos, no labels, nothing printed anywhere.”

“She presses the brass cap and a fine golden mist bursts into the backlight; she brings her wrist to her face, closes her eyes and breaks into a laugh. Static camera. Sound: the spray hiss, her laugh.”

“Trick candles. The boy blows hard and all five candles go out; a beat later they relight by themselves, one by one. He blows again, puffing his cheeks, and they relight again. His grandmother sighs, licks two fingers and pinches every flame out, deadpan, one by one, while the relatives behind them cheer and film on their phones. Handheld, slight shake. One continuous shot, no cuts. Sound: blowing, the fizz of trick candles relighting, laughter, cheering. No text, no logos, no labels, nothing printed anywhere.”

“Ground-level macro on the plain cobalt-and-white sneakers, which stay on his own two feet the whole time: his right foot stomps straight into the slush puddle on purpose, icy water explodes up and out, and he crosses the ball over and drives away from the camera through the spray, both feet in the same plain cobalt sneakers, while a train roars across the tracks overhead. The shoes have no logo or mark anywhere. One continuous shot, no cuts. Sound: the slap of the stomp, the splash, the ball bouncing, a train roaring overhead. No text, no logos, no labels, nothing printed anywhere.”

A sparkler on the rooftop
Inputs
What Kling O3 Pro takes
Only first_frame and duration and prompt are needed; everything else has a default. The same schema is public, with no key, at api.tryleap.ai/v1/public/models/kling/kling-o3-pro.
MCP
Or let your agent call it.
Leap's MCP server lets Claude Code, Claude, VS Code and other MCP clients run Kling O3 Pro, read its inputs and fetch the result, on your balance. Signing in happens in the browser, so there is no key to paste.
claude mcp add --transport http leap https://app.tryleap.ai/api/mcpClaude Code signs you in through the browser the first time it calls Leap.
curl -fsSL https://www.tryleap.ai/install.sh | shInstalls the Leap skill for every coding agent it finds: which endpoint to call, how to read a model's inputs, when to wait and when to poll.
Questions
Kling O3 Pro API questions
- How much does the Kling O3 Pro API cost?
- A 5-second clip without sound costs $0.75. By length and sound, a call costs $0.45 to $2.775. That is the provider's list price plus our margin, the same as in the studio. POST /v1/quotes prices any input for free before you run it.
- Can I try the Kling O3 Pro API for free?
- No. API keys run on paid credit, so a key's first call needs a top-up, and quotes are free. A 5-second clip without sound costs $0.75. A first top-up of $5, with no fee, covers six default calls.
- Do I pay for calls that fail?
- No. The price is held when a call starts and charged only if it succeeds. A call that fails, or that the model's safety filter refuses, comes back with status "failed" and a failure_cause, and the hold is released.
- Is this Kuaishou's own API?
- No. Leap is a separate service: it sends your call to Kuaishou's model and gives you what it makes, so you need no Kuaishou account. One Leap key runs Kling O3 Pro and every other model in the catalog, from one balance.
- What are the rate limits?
- 600 requests a minute per API key and 300 a minute per IP address. A batch starts up to 50 calls in one request. A 429 says how long to wait in its Retry-After header.
- Can an AI agent call it?
- Yes. Leap's MCP server lets Claude Code, Claude, VS Code and other MCP clients find Kling O3 Pro, read its inputs, run it and fetch the result on your balance. The client signs you in through the browser, so there is no key to paste.
Build with Kling O3 Pro.
Keys run on paid credit, and the first top-up has no fee. The same key runs every model on Leap.
Get an API key