{"uid":"cap_M8L7QLgX54_dRBdfhdcGV","slug":"wcag-contrast-ratio-checker-a2570dc4","name":"WCAG Contrast Ratio Checker","description":"WebberSites – Branding, Web Design, Photography, Marketing Strategy - Youngstown Ohio","url":"https://api.webbersites.com/api/a11y/contrast?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["fg","bg"],"properties":{"bg":{"type":"string","description":"Background color — hex or rgb()"},"fg":{"type":"string","description":"Foreground/text color — hex (#111 or #111111) or rgb()"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"passes":{"type":"object"},"summary":{"type":"string"},"contrast_ratio":{"type":"number"}}}}}}},"responseSchema":{"type":"json","example":{"passes":{"large_text":{"AA":true,"AAA":true},"normal_text":{"AA":true,"AAA":false}},"summary":"Good — passes AA for normal text and AAA for large text.","background":"#ffffff","foreground":"#767676","ratio_string":"4.54:1","contrast_ratio":4.54}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":{"p10Cents":"0.1000","medianCents":"0.1000","p90Cents":"0.1000","minCents":"0.1000","maxCents":"0.1000","p95Cents":"0.1000","sampleCount":1,"varies":false,"failureChargeRate":1},"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_sR4zD4Ep2FzL-jRu5OuKL","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Calculates the WCAG contrast ratio between a foreground and background color, returning the exact ratio and AA/AAA pass/fail verdicts for normal text, large text, and UI components.","exampleAgentPrompt":"What's the WCAG contrast ratio between foreground color #1a1a2e and background color #f0f4f8 — does it pass AA and AAA for normal text, large text, and UI components?","exampleUseCases":null,"resultDescription":"Returns the exact numeric contrast ratio (e.g. 7.43:1), plus pass/fail status for WCAG AA and AAA levels across three contexts — normal text, large text, and UI components — along with a plain-English summary verdict.","failureModes":["Missing fg or bg parameter returns a 400 error","Invalid color format (not hex or rgb()) returns a parsing error","Malformed hex codes (e.g. wrong length) may return an error or unexpected result","Network timeout if the service is temporarily unavailable"],"whenToPreferThis":"Use this endpoint when you need the precise WCAG contrast ratio computation between two specific colors, including separate AA/AAA verdicts for normal text, large text, and UI components. Prefer this over general URL-based accessibility checkers that cannot accept arbitrary color pairs as input.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-10T18:42:15.803Z","isFirstParty":false,"canonicalSlug":"wcag-contrast-ratio-checker-a2570dc4"}