# Color Toolkit – Color Scheme Generator

> Color Toolkit – Color Scheme Generator is a paid API for AI agents from color.openverbs.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Generates a color scheme (palette) from a base color using a specified color harmony type such as complementary, analogous, triadic, tetradic, or monochromatic.

## Facts

- Endpoint: POST https://color.openverbs.com/v1/scheme
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/color-toolkit-color-scheme-generator-4087b5e0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mRHUoNwobar2rJKxiA1m1

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability color-toolkit-color-scheme-generator-4087b5e0 -d '<json body>'
```

Example prompt: Generate a triadic color scheme based on the base color #3A86FF for my app design project.

## When to prefer this

Choose this endpoint when you need programmatically generated color palettes based on formal color theory harmony rules (complementary, analogous, triadic, tetradic, monochromatic) and want a consistent, deterministic result from a single base color. Prefer this over image-based palette extractors when you already have a known brand or seed color and need theory-grounded companion colors for design, UI, or branding work.

## Known failure modes

- Invalid or unparseable color value provided — returns error indicating unrecognized color format
- Unsupported harmony type enum value — returns validation error
- Missing required fields (color or type) — returns schema validation error
- Network timeout or service unavailability — returns 5xx error
- Payment failure (x402 protocol) — returns 402 Payment Required if funds are insufficient

## How this service works

Generate a harmony scheme (complementary, analogous, triadic, tetradic, monochromatic) from a base color.

## Output

Returns a set of colors forming a harmonious palette based on the specified harmony type (complementary, analogous, triadic, tetradic, or monochromatic) derived from the given base color. The palette is computed using color theory principles and typically includes the base color plus 1–4 companion colors depending on the harmony type.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "required": [
      "color",
      "type"
     ],
     "properties": {
      "type": {
       "enum": [
        "complementary",
        "analogous",
        "triadic",
        "tetradic",
        "monochromatic"
       ],
       "type": "string",
       "description": "Harmony type."
      },
      "color": {
       "type": "string",
       "maxLength": 128,
       "minLength": 1,
       "description": "Base color."
      }
     },
     "additionalProperties": false
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/color-toolkit-color-scheme-generator-4087b5e0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from color.openverbs.com](https://www.zero.xyz/host/color.openverbs.com/llms.txt)