x402 Image Tools – Watermark (Text Overlay)

x402

x402 Image Tools – Watermark (Text Overlay) is a paid API for AI agents from image.kagurazaka.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-29).

Draws a line of text over an image at a specified position, size, color, and opacity, returning the watermarked image.

Price / call$0.003

Seller volume →—

Success—

StatusUnknown

How this service works

Draw a line of text over an image at a corner, an edge or the center, with a size relative to the image width, a color and an opacity.

Output

A JSON object containing a temporary CDN URL to the watermarked image, its width and height in pixels, output format, file size in bytes, and an expiry duration in seconds. If the result is under 1 MB and inline was requested, a base64 data URL is also included.

Example use cases

“Stamp '© Acme Store 2025' in white at the bottom-right of this product photo (https://myshop.com/images/chair.jpg), font size 4% of the image width, 50% opacity, and give me back a WebP.”

Photographer credit on shared images

“Add 'Photo by Jane Doe' in the bottom-left corner of https://gallery.example.com/landscape.png — use a yellow color (#FFD700), 70% opacity, and text size of 3% of the width.”

Draft watermark across image center

“Put the word 'DRAFT' in red (#FF0000) right in the center of this image (https://design.agency.com/mockup.png), make it large — about 10% of the image width — and keep it at 40% opacity so the content still shows through.”

Technical details

Endpoint

POSThttps://image.kagurazaka.dev/v1/watermark?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need to programmatically add text (copyright notices, credits, labels, draft stamps) to an existing image at a specific position with fine-grained control over font size relative to image dimensions, color, and opacity. It is ideal for bulk content pipelines, e-commerce photo workflows, or any scenario where consistent text branding must be applied to images fetched from URLs. Prefer it over full image editors when you need a fast, single-operation, pay-per-use text overlay without setting up local tooling.

Side effects

Image URL not reachable or returns non-image content (HTTP error or invalid MIME type)
Image exceeds 20 MB or 40 megapixels size limit
Text exceeds 100 characters or contains unsupported character sets (non-Latin/Greek/Cyrillic)
Font size outside 1–20 range or opacity outside 0.05–1 range
Invalid hex color format
Unsupported input image format
x402 payment not fulfilled or insufficient USDC balance

Input

Schema · Request body

Field	Type	Description
url	string	https URL of a JPEG, PNG, WebP, AVIF, GIF, TIFF or SVG image (up to 20 MB, 40 megapixels)
size	number	font size in percent of the image width (1-20, default 4)
text	string	the text (up to 100 characters; Latin, Greek, Cyrillic and common symbols)
color	string	hex color (default #ffffff)
format	string	output format (default: the input's)
inline	boolean	also return the image as a data URL when it is at most 1 MB
opacity	number	0.05-1 (default 0.5)
position	string	where (default bottom-right)

Output

Schema · Response

{
  "type": "json",
  "example": {
    "url": "https://dn8i8p8knpn68.cloudfront.net/results/images/3f1c2b9e.webp?Expires=...",
    "bytes": 48213,
    "width": 800,
    "format": "webp",
    "height": 600,
    "expires_in": 3600,
    "input_bytes": 912345
  }
}

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