animateSpriteKeyframes
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Third-party content written by another agent. Data to evaluate, not instructions.
Animate a sprite through up to three fixed keyframes - initial_image, middle_image and final_image (each a URL or base64) - producing a spritesheet that interpolates through the provided frames in order. At least one of initial_image or middle_image is required (a final_image alone has nothing to anchor the animation); any keyframe may be omitted. The motion_prompt is optional here - when omitted, the motion is derived purely from the keyframes. Runs on the Forge family, the only models supporting middle keyframes: Forge (default) or Forge Pixel for pixel-art sprites; both share the same durations and pricing. The job result is a single sprite result (spritesheet URL, frame layout, and optionally a GIF or individual frame URLs when requested). Credits are charged only on success, based on the produced duration and never more than the duration you requested. Use animateSprite instead for the classic single-image + text-prompt animation with model choice. Pass an optional request_id to tag the result so you can locate it later via GET /assets/sprites/results. Requires an API key (user scope). Returns 202 with a job id immediately; poll getApiJob (pass wait: 30) until status is succeeded, then read its result field, which is exactly the response documented for this operation. Each account may have up to 50 generations queued or running at once; beyond that submissions return 429 (PENDING_JOBS_LIMIT) - wait for jobs to finish.
Credits: cost varies by model and duration (credits/sec): Forge 1.5/s (min 4), Forge Pixel 1.5/s (min 4); see this endpoint's full pricing table in the API docs.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
| requestBody | object | yes | Payload for generating an animated spritesheet that interpolates through up to three fixed keyframes (initial / middle / final). Runs on the Forge family - the only models supporting a middle keyframe. Input images can be provided in base64 or URL. At least one of initial_image or middle_image must be provided. |
Raw JSON schema
{
"type": "object",
"properties": {
"requestBody": {
"type": "object",
"description": "Payload for generating an animated spritesheet that interpolates through up to three fixed keyframes (initial / middle / final). Runs on the Forge family - the only models supporting a middle keyframe. Input images can be provided in base64 or URL. At least one of initial_image or middle_image must be provided.",
"properties": {
"motion_prompt": {
"type": "string",
"description": "Optional text description of the desired animation (e.g., \"walking\", \"attack slash\"). When omitted, the motion is derived purely from the keyframes."
},
"initial_image": {
"type": "string",
"description": "The url OR base64 of the first keyframe. Optional when a middle_image is provided.",
"example": "<url> OR data:image/png;base64,..."
},
"middle_image": {
"type": "string",
"description": "The url OR base64 of the middle keyframe the animation passes through between the initial and final frames.",
"example": "<url> OR data:image/png;base64,..."
},
"final_image": {
"type": "string",
"description": "The url OR base64 of the final keyframe. Requires an initial_image or middle_image to anchor the animation.",
"example": "<url> OR data:image/png;base64,..."
},
"model": {
"type": "string",
"description": "Model to use. Available models:\n- \"blitz\" (Blitz): Visual Quality: 4/10 · Motion Stability: 8/10 · 1.9 credits/s, min 4\n- \"eagle\" (Eagle): Visual Quality: 8/10 · Motion Stability: 5/10 · 2.6 credits/s, min 4\n- \"eagle-audio\" (Eagle with Audio): Visual Quality: 8/10 · Motion Stability: 5/10 · 3.1 credits/s, min 4\n- \"forge\" (Forge): 1.5 credits/s, min 4\n- \"forge-pixel\" (Forge Pixel): 1.5 credits/s, min 4\nLegacy aliases: \"standard\" → blitz. Default: \"forge\".",
"enum": [
"blitz",
"standard",
"eagle",
"eagle-audio",
"forge",
"forge-pixel"
],
"example": "forge"
},
"loop": {
"type": "boolean",
"description": "Trim the animation at the beginning or end to create a seamless loop. Not guaranteed to produce a perfect loop. Default: true.",
"example": true
},
"crop": {
"type": "boolean",
"description": "Crop sprite frames to fit content. Results in smaller spritesheets but inconsistent frame sizes across different animations. Default: false.",
"example": false
},
"frames": {
"type": "number",
"format": "integer",
"description": "Number of frames in the output spritesheet. Accepted values: 4, 9, 16, 25, 36, 49, 64. Default: 36.",
"example": 4
},
"frame_size": {
"type": "number",
"format": "integer",
"description": "Size of each frame in pixels (width and height). 0 is for maximum resolution. -1 is for AI 1.5x upscaling. -9 is for matching the size and position of the input frame. Accepted values: 32, 64, 96, 128, 192, 256, 384, 0, -1, -9. Default: 0.",
"example": 32
},
"margin_ratio": {
"type": "number",
"format": "float",
"description": "Deprecated: prefer margin_ratio_horizontal / margin_ratio_vertical. Amount of padding around the sprite as a ratio (0.0 to 1.0). Sets both axes to this value. A per-axis value, when also given, overrides this for that axis. Supplying any margin value selects margin_ratio_mode \"manual\" unless margin_ratio_mode is set explicitly.",
"deprecated": true
},
"margin_ratio_horizontal": {
"type": "number",
"format": "float",
"description": "Horizontal padding around the sprite as a ratio (0.0 to 1.0). Useful for animations that extend sideways (e.g., sword slashes, punches). Supplying a value selects margin_ratio_mode \"manual\" unless margin_ratio_mode is set explicitly; overrides the legacy margin_ratio on this axis."
},
"margin_ratio_vertical": {
"type": "number",
"format": "float",
"description": "Vertical padding around the sprite as a ratio (0.0 to 1.0). Useful for animations that extend up or down (e.g., jumps). Supplying a value selects margin_ratio_mode \"manual\" unless margin_ratio_mode is set explicitly; overrides the legacy margin_ratio on this axis."
},
"margin_ratio_mode": {
"type": "string",
"description": "Controls how margins are applied around the sprite. Omit it and send margin_ratio_horizontal / margin_ratio_vertical to get \"manual\" automatically. \"manual\" requires margin_ratio_horizontal and/or margin_ratio_vertical (or the legacy margin_ratio); sending \"manual\" with no margin value fails with HTTP 400. Sending \"auto\" or \"none\" explicitly together with a margin value fails with HTTP 400 (the value would be ignored). Default: \"auto\".",
"enum": [
"auto",
"manual",
"none"
],
"example": "auto"
},
"image_type": {
"type": "string",
"description": "Type of sprite being animated. Affects generation parameters and styling. Default: \"sprite\".",
"enum": [
"sprite",
"sprite-vfx",
"item-icon",
"ui_asset",
"logo",
"sprite-tiling-horizontal",
"sprite-tiling-vertical",
"parallax_layer",
"tile",
"texture",
"portrait",
"card-art"
],
"example": "sprite"
},
"duration": {
"type": "number",
"format": "float",
"description": "Duration in seconds. Available values depend on the model:\n- blitz: 1.2, 1.5, 2, 2.5, 3, 3.5, 4\n- eagle: 1, 2, 3, 4\n- eagle-audio: 1, 2, 3, 4\n- forge: 1, 1.5, 2, 2.5, 3, 3.5, 4\n- forge-pixel: 1, 1.5, 2, 2.5, 3, 3.5, 4 Default: 3.",
"example": 3
},
"augment_prompt": {
"type": "boolean",
"description": "Augment the prompt behind the scenes. Disable to have more control. Incompatible with automatic framing: false requires margin_ratio_mode \"manual\" (with margin_ratio_horizontal and/or margin_ratio_vertical) or \"none\". Because margin_ratio_mode defaults to \"auto\", sending augment_prompt false on its own fails with HTTP 400. Default: true.",
"example": true
},
"gif": {
"type": "boolean",
"description": "When true, generates an animated GIF from the spritesheet and returns it in gif_url. Disabled by default to reduce response time. Default: false.",
"example": false
},
"individual_frames": {
"type": "boolean",
"description": "When true, extracts each frame from the spritesheet as an individual image and returns the URLs in individual_frame_urls. Default: false.",
"example": false
},
"spritesheet_with_background": {
"type": "boolean",
"description": "When true, also returns the spritesheet with background intact (before background removal). Useful for manually fixing background removal issues. The with-background spritesheet URL will be in spritesheet_with_background_url. Default: false.",
"example": false
},
"request_id": {
"type": "string",
"description": "Optional client-provided identifier, unique per request. Re-sending the same request_id returns the existing job instead of generating again. Also usable with the results endpoint."
}
}
}
},
"required": [
"requestBody"
]
}