Sprite tools
Sprite tools: Smoother sprite animation: in-between frames from motion between your frames (4 frames to 8 or 12), pixel art stays crisp with no new colours, holds stay holds, loop seam included; sheet, JSON and a before/after GIF. Full schema: https://rengi.dev/v1/sprite-tools/schema
Answeringour last check, 2026-10-31
1 of 1checks answered this week
937 msmedian answer time
$0.05listed price per call
$0.05price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://rengi.dev/v1/sprite-tools/inbetween
| Category | Everything else |
|---|---|
| Provider host | rengi.dev |
| Networks | eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-31 | valid payment request | 402 | $0.05 | 937 ms |
Example input (from the provider)
{
"body": {
"cols": 4,
"factor": 2,
"rows": 1,
"sheet": {
"imageUrl": "https://rengi.dev/samples/walk-sheet.png"
}
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"cols": {
"maximum": 64,
"minimum": 1,
"type": "integer"
},
"count": {
"description": "Frames used from the sheet when the last row is not full.",
"maximum": 64,
"minimum": 2,
"type": "integer"
},
"factor": {
"default": 2,
"description": "2: one new frame between each pair (4 frames become 8 for a loop); 3: two new frames.",
"enum": [
2,
3
],
"type": "number"
},
"fps": {
"default": 12,
"description": "Frame rate of the original, for the preview.",
"maximum": 60,
"minimum": 1,
"type": "integer"
},
"frames": {
"description": "The animation frames in order, all the same size.",
"items": {
"additionalProperties": false,
"properties": {
"image": {
"description": "Base64 PNG, JPEG or WebP.",
"type": "string"
},
"imageUrl": {
"format": "uri",
"type": "string"
}
},
"type": "object"
},
"maxItems": 32,
"minItems": 2,
"type": "array"
},
"loop": {
"default": true,
"description": "Also make in-betweens from the last frame back to the first.",
"type": "boolean"
},
"mode": {
"default": "auto",
"description": "pixel: crisp, no new colours; smooth: blended; auto picks pixel for hard alpha and a small palette.",
"enum": [
"auto",
"pixel",
"smooth"
],
"type": "string"
},
"rows": {
"maximum": 64,
"minimum": 1,
"type": "integer"
},
"sheet": {
"additionalProperties": false,
"description": "Or one sprite sheet, cut into cols x rows equal cells (row by row).",
"properties": {
"image": {
"description": "Base64 PNG, JPEG or WebP.",
"type": "string"
},
"imageUrl": {
"format": "uri",
"type": "string"
}
},
"type": "object"
}
},
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"additionalProperties": false,
"properties": {
"fps": {
"description": "Frame rate that keeps the original speed.",
"type": "number"
},
"frameCount": {
"type": "number"
},
"frames": {
"description": "Every frame in order, originals and new ones.",
"items": {
"type": "string"
},
"type": "array"
},
"json": {
"description": "Frame rects in the sheet, which frames are new, and the new frame rate.",
"type": "string"
},
"mode": {
"enum": [
"pixel",
"smooth"
],
"type": "string"
},
"preview": {
"description": "GIF: original on the left, the new animation on the right, same speed.",
"type": "string"
},
"sheet": {
"description": "All frames in one row (or a grid when there are many).",
"type": "string"
},
"zip": {
"type": "string"
}
},
"required": [
"frames",
"sheet",
"json",
"preview",
"zip",
"mode",
"fps",
"frameCount"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}