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Leap API

H3 Max Recast APIMiniMax's model, through Leap

Recasts the people in a video from up to four photos, one per person, left to right, keeping the motion, camera, cuts and sound. Billed by the length of the video. One Leap key and one balance run it and every other model, priced per call in dollars.

Get an API keyRead the quickstart

First $5 top-up, no card fee.

  • One key for every model
  • Every call quoted first
  • A failed call costs nothing
# Videos and sounds go up in three steps: start an upload of the file's# exact size, PUT the file where the answer says, then complete it.upload() {  UPLOAD=$(jq -n --arg type "$2" --arg name "$1" --argjson bytes "$(wc -c < "$1")" \    '{content_type: $type, bytes: $bytes, filename: $name}' \    | curl -s https://api.tryleap.ai/v1/uploads -H "x-api-key: $LEAP_API_KEY" \      -H "content-type: application/json" -d @-)  echo "$UPLOAD" | jq -r '"url = \"\(.upload_url)\"", "request = \"\(.upload_method)\"",    (.upload_headers | to_entries[] | "header = \"\(.key): \(.value)\"")' \    | curl -sf -K - -T "$1" > /dev/null  curl -s -X POST "https://api.tryleap.ai/v1/uploads/$(echo "$UPLOAD" | jq -r .id)/complete" \    -H "x-api-key: $LEAP_API_KEY" -H "content-type: application/json" -d '{}' | jq -r .id} VIDEO_ID=$(upload clip.mp4 video/mp4) # Upload the image (PNG, JPEG or WebP, up to 4 MB) and keep its ID.IMAGES_ID=$(curl -s "https://api.tryleap.ai/v1/files?filename=photo.jpg" \  -H "x-api-key: $LEAP_API_KEY" \  -H "content-type: image/jpeg" \  --data-binary @photo.jpg | jq -r .id) # Then run the model with them.jq -n --arg video "$VIDEO_ID" --arg images "$IMAGES_ID" '{  "model": "minimax/h3-max-recast",  "input": {    "prompt": "A heron lands on a still lake at dawn",    "resolution": "1080P",    "video": $video,    "images": [      $images    ]  }}' \  | 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 video and 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
minimax/h3-max-recast
Price per call
$0.56 a second of your video
This call
It costs $0.56 a second of your video.
First top-up
A first top-up of $5, with no fee, pays for your first calls.

What it makes

Made with H3 Max Recast

Real H3 Max Recast runs on Leap. Each one passed Leap's media quality check before it was shown.

More on the H3 Max Recast page
  • A street pianist, recast from one photo, a real run on Leap

    A street pianist, recast from one photo

The answer

What comes back

A generation. Check status first: succeeded has the file in output, a signed link that works for 24 hours, so download what you keep. failed has error and failure_cause, and costs nothing. usage.cost_usd is what the call was charged.

200 OK, trimmed
{  "id": "gen_...",  "object": "generation",  "model": "minimax/h3-max-recast",  "status": "succeeded",  "output": [    {      "type": "video",      "url": "https://api.tryleap.ai/files/..."    }  ],  "error": null,  "usage": {    "cost_usd": "..."  }}

Inputs

What H3 Max Recast takes

Only video and images are needed; everything else has a default. The same schema is public, with no key, at api.tryleap.ai/v1/public/models/minimax/h3-max-recast.

Promptprompt
Text, up to 2,000 characters
Videovideo
An image, requiredThe video to work on: an uploaded file, by ID. From 5 to 17 seconds.
Imagesimages
Up to 4 images, requiredUploaded files to edit or combine, by ID.
Resolutionresolution
768P, 1080P. Default: 1080P
Seedseed
0 to 4294967295The same seed and input give the same image.

Pricing

Price per call

It costs $0.56 a second of your video. A first top-up of $5, with no fee, pays for your first calls. Prices are the provider's list price plus our margin (35% on most models, less on the dearest video), read from the catalog, and a quote gives the exact price of any input for free.

A free quote
# With $VIDEO_ID and $IMAGES_ID from the uploads above.jq -n --arg video "$VIDEO_ID" --arg images "$IMAGES_ID" '{  "model": "minimax/h3-max-recast",  "input": {    "prompt": "A heron lands on a still lake at dawn",    "resolution": "1080P",    "video": $video,    "images": [      $images    ]  }}' \  | curl https://api.tryleap.ai/v1/quotes \    -H "x-api-key: $LEAP_API_KEY" \    -H "content-type: application/json" \    -d @-

How it works

How the H3 Max Recast API works

Every model takes the same request, a model ID and its input, and results, prices, failures and limits work the same way for all of them.

  • Wait for it, or hear when it ends

    prefer: wait=60 holds the request until the result is ready, for up to a minute. A longer run is read again by its ID, or a signed webhook tells your server when it ends.

    prefer: wait=60 / "webhook": "https://..."

    In the docs

  • Failed calls cost nothing

    The price is held when a call starts and charged only if it succeeds. A failed or refused call comes back with its failure_cause, and the hold is released.

    "status": "failed" / "failure_cause": "provider_refused"

    In the docs

  • The price before the call

    POST /v1/quotes takes the same body as a generation and returns its exact price, with the input checked, for free. Every result carries what it was charged.

    POST https://api.tryleap.ai/v1/quotes / "cost_usd"

    In the docs

  • Rate limits

    600 requests a minute per API key and 300 per IP address. A 429 carries Retry-After with the seconds to wait.

    RateLimit-Remaining / Retry-After

    In the docs

  • Safe retries

    Send an idempotency key and a retry after a dropped connection returns the same generation instead of starting a second one.

    idempotency-key: <uuid>

    In the docs

  • Batches

    POST /v1/batches starts up to 50 calls in one request, priced and held together, so either all start or none do.

    POST https://api.tryleap.ai/v1/batches

    In the docs

MCP

Or let your agent call it.

Leap's MCP server lets Claude Code, Claude, VS Code and other MCP clients run H3 Max Recast, read its inputs and fetch the result, on your balance. Signing in happens in the browser, so there is no key to paste.

Connect an agentThe agent guide
Add Leap to Claude Code
claude mcp add --transport http leap https://app.tryleap.ai/api/mcp

Claude Code signs you in through the browser the first time it calls Leap.

Teach your coding agent the Leap API
curl -fsSL https://www.tryleap.ai/install.sh | sh

Installs 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

H3 Max Recast API questions

How much does the H3 Max Recast API cost?
It costs $0.56 a second of your video. 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 H3 Max Recast 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 first top-up of $5, with no fee, pays for your first 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 MiniMax's own API?
No. Leap is a separate service: it sends your call to MiniMax's model and gives you what it makes, so you need no MiniMax account. One Leap key runs H3 Max Recast 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 H3 Max Recast, 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 H3 Max Recast.

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