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Free up to 10 pages a day per client address, no key needed; sample report: https://difficat.com/agents/sample/report.json. Compares Site A against Site B on page existence, content and visual regression, priced on the pages it compares. Call it for a migration or redesign check: sourceUrl and targetUrl let discovery pick the pages (maxPages caps them), or urls names the pairs; then wait_for_comparison until it ends and get_report with failedOnly: true. Not for one page you only want to see: that is capture_screenshot. dryRun: true answers the page count and price (0.02 USD a page, 0.01 beyond 1000) without charging; a job above the remaining free allowance is refused with a payment challenge carrying nextSteps for your human. maxPriceUsd refuses a dearer job before any challenge. Example: { "urls": [{ "source": "https://old.example/a", "target": "https://new.example/a" }] }. Answers with jobId, jobToken, status, pagesCharged and, on a free run, sample and allowanceRemaining.