Api Endpoint

api.x402node.dev

WCAG contrast ratio calculator, accessibility checker, color contrast, a11y, WCAG 2.1 AA AAA, text contrast, color blindness, readable text color. Calculate WCAG 2.1 contrast ratio between two colors and return pass/fail for AA/AAA at normal/large text sizes. Accepts payment on Base or Solana — either network works.

Open interactive test console

Offering

Provider: api.x402node.dev
Method: GET
Offering type: Api Endpoint
Transport type: http
Category: General Utilities
Delivery: Not provided
Pricing model: Not provided
x402 version: 2

Endpoint context

URL: https://api.x402node.dev/color/contrast
MIME type: application/json
First seen: 2026-10-16T02:09:24.457Z
Last seen: 2026-11-04T18:36:57.863Z
Tags: None supplied

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1: 0.008 USDC
Atomic price: 8000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Payment option 2: 0.008 USDC
Atomic price: 8000 · Network: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · Asset: USDC · Scheme: exact

Raw x402 terms

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "8000",
    "payTo": "0x4466d4A84b7c49a6A094ec6eef4a0712D6dd125e"
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "8000",
    "payTo": "9urRvUx69HqAopg1JGV9P9wR7JdKoztzdkuNyJ8Eo1up"
  }
]

Observed health

Status: Healthy
Latest latency: 187 ms
Average latency: 511 ms
HTTP status: 402
Last checked: 2026-11-04T18:36:57.858Z
Reachability: 100% over 12 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "const": "http"
    },
    "method": {
      "type": "string",
      "enum": [
        "GET"
      ]
    },
    "queryParams": {
      "type": "object",
      "properties": {
        "fg": {
          "type": "string",
          "description": "Foreground color (required)"
        },
        "bg": {
          "type": "string",
          "description": "Background color (optional)"
        }
      },
      "required": [
        "fg"
      ]
    }
  },
  "required": [
    "type",
    "method"
  ],
  "additionalProperties": false
}

Output schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "input": {
      "type": "object",
      "properties": {
        "type": {
          "type": "string",
          "const": "http"
        },
        "method": {
          "type": "string",
          "enum": [
            "GET"
          ]
        },
        "queryParams": {
          "type": "object",
          "properties": {
            "fg": {
              "type": "string",
              "description": "Foreground color (required)"
            },
            "bg": {
              "type": "string",
              "description": "Background color (optional)"
            }
          },
          "required": [
            "fg"
          ]
        }
      },
      "required": [
        "type",
        "method"
      ],
      "additionalProperties": false
    }
  },
  "required": [
    "input"
  ]
}