Rengi Forge: Sprite Background Remover

x402

Rengi Forge: Sprite Background Remover is a paid API for AI agents from rengi.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-22).

Removes the background from a sprite, prop, or character image using either exact color keying for flat backgrounds or AI segmentation for complex ones, returning a clean trimmed PNG with pivot metadata.

Price / call$0.05

Seller volume →—

Success—

StatusUnknown

How this service works

Sprite tools: Cut a sprite, prop or character out of its background: exact keying for one-color backgrounds (text and holes too), AI segmentation for busy ones; clean edges with no halo, trimmed, with a pivot. AI mode handles one main subject, not text on photos. Full schema: https://rengi.dev/v1/sprite-tools/schema

Output

A background-removed, edge-cleaned PNG with no halo artifacts, optionally trimmed to tight bounds, with a specified pivot point (bottom or center) and configurable padding. AI mode isolates the main subject; flat mode keys out the border color including through text and holes.

Example use cases

Game character cutout for Unity

“Cut this game character out of its solid blue background — use flat mode, keep the main subject only, trim it, and set the pivot to bottom so it sits on the ground correctly. Image is at https://assets.mygame.com/hero_idle.png”

AI segmentation for busy scene photo

“Remove the background from this photo of a treasure chest prop — the background is complicated so use AI mode, keep just the main subject, add 4 pixels of padding, and trim it. Here's the base64 image data: [base64string]”

Prop sheet cutout preserving all elements

“I've got a sprite of multiple props on a white background — remove the background using flat keying, but keep all elements not just the main subject, trim it, and center the pivot. The image URL is https://cdn.mygame.com/props_sheet.png”

Technical details

Endpoint

POSThttps://rengi.dev/v1/sprite-tools/remove-bg?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need game-ready sprite cutouts with clean edges, proper pivot metadata, and trim — especially when integrating into a game asset pipeline for Unity, Godot, or similar engines. It excels over generic background-removal APIs because it handles both exact flat-color keying (preserving text and holes) and AI segmentation, and outputs pivot-aware trimmed sprites rather than full-canvas PNGs. Prefer flat mode for solid-color backgrounds for crisp results; use AI mode for photos or complex scenes with one clear main subject.

Side effects

Image has a multicolor/gradient background but flat mode is selected — result will be incomplete removal
AI mode struggles with images containing multiple equal-prominence subjects
Input image exceeds supported size or format constraints
Invalid base64 encoding causes a parse error
Image URL is inaccessible or returns a non-image content type
Subject has very similar color to background causing bleed-through in flat mode

Input

Schema · Request body

Field	Type	Description
keep	string	main: only the main subject and what touches it; all: everything that is not background. auto: all for flat backgrounds, main after AI.
mode	string	auto: flat key when the border is one color, AI segmentation otherwise.
trim	boolean
image	string	Base64 PNG, JPEG or WebP.
pivot	string
padding	integer
imageUrl	string

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