Marketplace · API · x402

api.webbersites.com/api/a11y/contrast

WCAG contrast ratio between two colors — the check the URL-based a11y endpoint can't do. Give a foreground and background color (hex or rgb()); returns the exact ratio and AA/AAA pass/fail for normal text, large text, and UI components, with a plain-English verdict. ?fg=&bg=

Endpoint	`https://api.webbersites.com/api/a11y/contrast`
Trust	✓ Verified callable · 100% uptime over 1 checks · ~103 ms
Pricing	Pay per call with x402, no account. Call it to get an exact quote before paying.
network	eip155:8453
scheme	exact
pay to	0xdd5fcEa81CA6f1EB39FEd5B973DE794293B81ba6
method	GET
last updated	2026-11-01T06:53:28.993Z

Use it

Call it (an x402 client pays automatically)

curl -i https://api.webbersites.com/api/a11y/contrast
# 402 reply -> sign PAYMENT-REQUIRED with an x402 client (e.g. @x402/fetch) -> retry with PAYMENT-SIGNATURE

This listing as JSON

curl https://aipaygen.com/v1/catalog/api/x402-fef8b587c447d834

Search the whole marketplace from your agent (MCP)

{
  "mcpServers": {
    "aipaygen": {
      "url": "https://aipaygen.com/mcp"
    }
  }
}