Index onlineMerchant portal
Api Endpoint

Saylor Innovations WCAG Contras

WCAG contrast ratio calculator for two sRGB colors - luminance, ratio and AA/AAA flags

Open interactive test console

Offering

Provider
saylorinnovations.com
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://saylorinnovations.com/api/accessibility/contrast
MIME type
application/json
First seen
2026-10-16T01:51:51.176Z
Last seen
Tags
Accessibility, contrast, WCAG, contrast-ratio, calculator, tap-target, rem

Website

Payment pricing

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

Payment option 1
0.01 USDC
Atomic price: 10000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Payment option 2
0.01 USDC
Atomic price: 10000 · Network: eip155:137 · Asset: USDC · Scheme: exact
Payment option 3
0.01 USDC
Atomic price: 10000 · Network: eip155:42161 · Asset: USDC · Scheme: exact
Payment option 4
0.01 USDC
Atomic price: 10000 · Network: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · Asset: USDC · Scheme: exact
Payment option 5
10000 atomic units
Atomic price: 10000 · Network: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · Asset: Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB · Scheme: exact
Raw x402 terms
[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa"
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "10000",
    "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa"
  },
  {
    "scheme": "exact",
    "network": "eip155:42161",
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "amount": "10000",
    "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa"
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "10000",
    "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7"
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "asset": "Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB",
    "amount": "10000",
    "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7"
  }
]

Observed health

Status
Healthy
Latest latency
254 ms
Average latency
732 ms
HTTP status
402
Last checked
Reachability
100% over 11 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",
        "POST",
        "PUT",
        "PATCH",
        "DELETE",
        "HEAD"
      ]
    },
    "queryParams": {
      "type": "object",
      "properties": {
        "foreground": {
          "type": "string",
          "description": "required RGB such as 0,0,0 (query)"
        },
        "background": {
          "type": "string",
          "description": "required RGB such as 255,255,255 (query)"
        }
      },
      "required": [
        "foreground",
        "background"
      ]
    }
  },
  "required": [
    "type",
    "method",
    "queryParams"
  ],
  "additionalProperties": false
}

Output schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "const": "json"
    },
    "description": {
      "type": "string"
    },
    "example": {
      "type": "object",
      "additionalProperties": true,
      "description": "Output fields observed in live endpoint responses; optionality and values can vary by record.",
      "properties": {
        "foreground_rgb": {
          "type": "array",
          "items": {
            "type": "number"
          },
          "description": "Foreground rgb"
        },
        "background_rgb": {
          "type": "array",
          "items": {
            "type": "number"
          },
          "description": "Background rgb"
        },
        "contrast_ratio": {
          "type": "number",
          "description": "WCAG contrast ratio from 1 to 21"
        },
        "aa_normal": {
          "type": "boolean",
          "description": "Aa normal"
        },
        "aa_large": {
          "type": "boolean",
          "description": "Aa large"
        },
        "aaa_normal": {
          "type": "boolean",
          "description": "Aaa normal"
        },
        "aaa_large": {
          "type": "boolean",
          "description": "Aaa large"
        },
        "formula": {
          "type": "string",
          "description": "Formula used for the calculation"
        },
        "scope_note": {
          "type": "string",
          "description": "What this data covers and what it leaves out"
        }
      },
      "required": [
        "foreground_rgb",
        "background_rgb",
        "contrast_ratio",
        "aa_normal",
        "aaa_normal",
        "scope_note"
      ]
    }
  },
  "required": [
    "type"
  ]
}