QuickBuild / LaunchCheck v1

LaunchCheck

Paste a URL, get a pre-launch report in seconds. Built for indie devs shipping fast and for AI agents that need a machine-readable site check. No signup, no API key.

Free check: 20 per hour per IP. Results cached 10 minutes.

Pricing

Free $0

HTTP status code of the final URL
HTTPS, http→https redirect, redirect chain
Title and meta description (presence + length)
Open Graph + Twitter card tags
robots.txt (incl. "Disallow: /"), noindex, XML sitemap

GET /launchcheck?url=…

Full report $0.05 per URL

Everything in Free, plus:
Broken links: up to 50 links on the page checked (internal + external), og:image load check
Desktop (1280×800) + mobile (390×844) screenshots
Load time: edge TTFB + real-browser load, requests, KB transferred
Image alt text, heading outline (h1 count, skipped levels), mobile overflow / viewport
Prioritized fix list (P1 blocks launch → P3 polish) with copy-paste fixes

GET /launchcheck/full?url=…
Paid in USDC on Base via x402. Errors (bad URL, site unreachable) are never charged.

API

Free (JSON):

curl -s "https://quickbuild.quynguyenbac.workers.dev/launchcheck?url=https://example.com" | jq '.summary, .checks[] | {id, status, message}'

Free (HTML report): add &format=html or open it in a browser: example.com report

Paid full report: an unpaid call returns 402 Payment Required with the x402 v2 challenge (PAYMENT-REQUIRED header, same JSON in the body):

curl -si "https://quickbuild.quynguyenbac.workers.dev/launchcheck/full?url=https://example.com" | head -20
# alias: https://quickbuild.quynguyenbac.workers.dev/launchcheck?url=https://example.com&tier=full

Pay with any x402 client, e.g. @x402/fetch:

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPaymentFromConfig } from '@x402/fetch';
import { ExactEvmScheme } from '@x402/evm';
import { privateKeyToAccount } from 'viem/accounts';
const pay = wrapFetchWithPaymentFromConfig(fetch, { schemes: [{ network: 'eip155:8453', client: new ExactEvmScheme(privateKeyToAccount(process.env.EVM_PRIVATE_KEY)) }] });
const r = await pay('https://quickbuild.quynguyenbac.workers.dev/launchcheck/full?url=https://your-site.com');
const report = await r.json();   // report.fixes[] sorted P1 → P3, report.screenshots.desktop.dataUrl …

MCP: tool launchcheck_full on the remote MCP server https://quickbuild.quynguyenbac.workers.dev/mcp (x402 over MCP). Free quick check: free_site_check.

Discovery: /openapi.json · /.well-known/x402 · /llms.txt

Response shape

{
  "tool": "launchcheck/1.0.x", "tier": "free" | "full", "url": "...", "finalUrl": "...", "status": 200,
  "summary": { "pass": 4, "warn": 1, "fail": 0, "total": 5, "score": 90, "issues": { "P1": 0, "P2": 1, "P3": 2 } },
  "checks": [ { "id": "status|https|title_description|social|robots_sitemap|load_time|image_alt|headings|broken_links|mobile",
                "label": "...", "status": "pass|warn|fail", "message": "...", ...details } ],
  "issues":  [ ... ]              // free: problems found
  "fixes":   [ { "rank": 1, "priority": "P1", "check": "...", "problem": "...", "fix": "...", "impact": "..." } ],  // full
  "screenshots": { "status": "ok|unavailable", "desktop": { "dataUrl": "data:image/jpeg;base64,..." }, "mobile": {...} }  // full
}

Safety & limits

Read-only GET/HEAD requests with a clear user agent. Only public http(s) hostnames on ports 80/443; IP literals, internal names and hosts resolving to private/reserved IPs are refused (every redirect hop re-checked).
Timeouts: 10 s per page fetch, 8 s per link, 15 s browser navigation. HTML capped at 1.5 MB.
Screenshots use Cloudflare Browser Rendering's free quota; when it is exhausted the full report still returns (with screenshots.status: "unavailable").
Free tier: 20 checks/hour per IP. Paid tier: no account needed.

Contact: quickbuild@mail.grokbot.com · Payments to Base 0x751a4c3841bE287544C371B4EE09Bd3366AeA7cf