sitecheck-x402

# SiteCheck: pay-per-call tools for AI agents (x402 on Base, Solana and Arc)

[![Listed on mcpservers.org](https://mcpservers.org/badge.svg)](https://mcpservers.org/servers/bck-stack/sitecheck-x402)

**Live:** https://api.sitecheck-api.workers.dev · listed on [x402scan](https://www.x402scan.com), the official [MCP Registry](https://registry.modelcontextprotocol.io) (`io.github.bck-stack/sitecheck`), [Smithery](https://smithery.ai/server/bolat/sitecheck) and [mcpservers.org](https://mcpservers.org/servers/bck-stack/sitecheck-x402) · MCP: `/mcp` · discovery: `/.well-known/x402`, `/openapi.json`

SiteCheck is a small API that AI agents can use **without an account or API key**: 29 pay-per-call tools in all. Besides its AI and web tools (including a [web page to Markdown reader](#web-documents-e-mail-domain-and-solana-data)), it sells PDF to text, translation, tech stack detection, sitemap URLs, exchange rates, e-mail, domain and Solana token and wallet data, [business and compliance data](#business-and-compliance-data) (EU VAT, IBAN, LEI, US recalls, OSHA/EPA enforcement, UK insolvency notices), prediction-market data and unsigned trade transactions [powered by Panta](#prediction-markets-panta). Every call is paid per request in **USDC** with the [x402](https://x402.org) protocol, on **Base**, **Solana** or **Arc** (Circle's L1), whichever the buyer holds USDC on. Call it, get a `402 Payment Required` listing the price on each network, sign the payment and get the result. It runs on Cloudflare Workers and Workers AI.

| Endpoint | Price | What it does |
|---|---|---|
| `GET /api/audit?url=` | $0.02 | Website audit: WCAG 2.2 accessibility issues with fixes and a score (European Accessibility Act), SEO basics, security headers, tech stack |
| `GET /api/contacts?url=` | $0.01 | Company contact enrichment from a domain: emails, phones, socials, tech |
| `GET /api/hiring?q=&remote=` | $0.01 | Searches the current Hacker News "Who is hiring?" thread |
| `POST /api/chat` | $0.004 | Llama 3.3 70B chat completion |
| `POST /api/image` | $0.005 | FLUX.1 schnell text-to-image |
| `POST /api/transcribe` | $0.01 | Whisper large-v3-turbo speech-to-text |
| `POST /api/tts` | $0.02 | Deepgram Aura-2 text-to-speech |
| `POST /api/embed` | $0.001 | BGE-M3 embeddings (1024-d, multilingual) |
| `GET /api/vat?number=` | $0.002 | EU VAT number check: format and checksum locally, then the official VIES service (27 EU states + Northern Ireland) |
| `GET /api/iban?iban=` | $0.001 | IBAN validation with no network call: registry structure and length, mod-97, national check digits, bank/branch/account split; `ibans=` for up to 50 |
| `GET /api/lei?q=` | $0.005 | GLEIF lookup by LEI or company name: status, registration, parents, children, one-line `kycSummary` |
| `GET /api/recalls?q=&source=&since=&classification=&limit=` | $0.003 | US product recalls from openFDA and CPSC in one schema, with a high/medium/low severity |
| `GET /api/violations?company=&state=&since=&minPenalty=&source=&limit=` | $0.005 | US enforcement cases: OSHA (DOL API, needs a key on the deployment) and EPA ECHO, with official record links |
| `GET /api/uk-insolvency?since=&q=&postcode=&type=&limit=` | $0.003 | UK company insolvency notices from The Gazette (our nightly cache of the last 8 days), optional Companies House enrichment |
| `GET /api/read?url=&format=&maxChars=&links=` | $0.002 | One web page as clean Markdown or text for an LLM: main content only, title, description, author, date, language, canonical; robots.txt respected |
| `GET /api/email-check?email=` | $0.001 | E-mail pre-check without SMTP: syntax, mail DNS, disposable domain, role account, free provider, typo suggestion; `emails=` for up to 50 |
| `GET /api/domain?domain=` | $0.002 | RDAP (WHOIS successor) and DNS: registered or available, registrar, created/expiry dates, status, DNSSEC, name servers, IPs, MX |
| `GET /api/solana/token?address=` | $0.002 | Solana token check: price, market cap, liquidity, holders, 24h trading, organic score, top-holder share, on-chain mint/freeze authority and Token-2022 extensions, red flags |
| `GET /api/solana/trending?mode=&interval=&minLiquidityUsd=` | $0.003 | Trending, new, top-traded or top-organic Solana tokens with the same fields and flags |
| `GET /api/solana/wallet?address=` | $0.003 | Solana wallet holdings: SOL and every token with symbol, USD price and value, total in USD |
| `GET /api/tech?url=` | $0.003 | Website technology detection (CMS, e-commerce, analytics, CDN, hosting, chat, payments, e-mail provider) with version, confidence and evidence |
| `POST /api/pdf` | $0.003 | PDF to text by URL or base64 (up to 15 MB), page by page, with title, author and dates; text PDFs only |
| `GET /api/sitemap?url=&pathPrefix=&since=` | $0.002 | Every URL in a site's XML sitemaps with lastmod, newest first |
| `GET /api/fx?from=&to=&amount=&date=` | $0.001 | ECB exchange rates (latest, a past date or a time series) with amount conversion |
| `POST /api/translate` | $0.002 | Translation with Llama 3.1 8B, up to 6,000 characters, formatting kept |

## Prediction markets (Panta)

Agents can buy market intelligence and ready-to-sign trade transactions per call, with no account and no API key. An agent researching an event pays a fraction of a cent to find the markets and one cent for a market's odds and a neutral brief. An agent that wants to act pays for an unsigned [Panta](https://panta.market) buy transaction and signs it with its own wallet. Panta runs USDC prediction markets on Solana.

| Endpoint | Price | What it does |
|---|---|---|
| `GET /api/markets?q=&status=&category=&limit=` | $0.002 | Searches Panta's markets. Compact rows: id, question, YES/NO prices and implied probabilities, volume, close and resolution times, resolution source |
| `GET /api/markets/brief?id=` | $0.01 | One market: current odds, recent trading activity and a short neutral AI summary of what it asks, what resolves it and what the price implies |
| `POST /api/markets/quote` | $0.005 | Body `{ id, side: "yes"\|"no", amountUsdc, wallet }`. Panta's quote: expected shares, average price, fee, and price impact against the spot price |
| `POST /api/markets/build-buy` | $0.01 | Same body, plus an optional `maxSlippageBps`. Returns the **unsigned** transaction (Solana v0, base64) and Panta's instructions for the agent to sign and broadcast itself, plus the fields for the trade report |
| `POST /api/markets/report` | free | After broadcasting, send `{ signature, orderId, quoteId, id, wallet }`. SiteCheck forwards it to Panta, which confirms and attributes the trade |

- **No custody.** SiteCheck never signs, holds keys or custodies funds. `build-buy` hands back an unsigned transaction whose only signer is the agent's wallet.
- **Information only, not financial advice.** Every response says so (`disclaimer`), and the brief never recommends a trade. If the model's text reads like advice, a factual template is returned instead.
- **Powered by Panta.** Every response carries `poweredBy: { text: "Powered by Panta", url: "https://panta.market" }`, as Panta's Terms of Use require.
- **Pay only for results**, as with every tool: if Panta refuses or fails, the call returns an error and nothing is settled. The catalog is cached for 45 seconds and prices for 15 seconds, and responses say how old their data is.
- The tools are on only when the `PANTA_API_KEY` secret is set. Otherwise they are hidden, and `GET /health` says why. Endpoints, shapes, attribution and open questions: [docs/PANTA.md](docs/PANTA.md).

```bash
node scripts/demo-markets.mjs --q bitcoin            # search, brief and quote, paid on Solana (~0.017 USDC)
node scripts/demo-markets.mjs --q bitcoin --build    # also builds the unsigned transaction (+0.01); never signs or sends it
```

## Web, documents, e-mail, domain and Solana data

| Tool | Source | Notes |
|---|---|---|
| `/api/read` | The page itself, fetched once with the `SiteCheckReader` User-Agent | `robots.txt` is respected (a disallowed page answers 403 and is not charged). No JavaScript is run, so pages that only render in the browser come back empty (422, not charged). PDFs and other binary files answer 415. The content belongs to its publisher. |
| `/api/email-check` | DNS over HTTPS (Cloudflare, Google) and the [disposable-email-domains](https://github.com/disposable-email-domains/disposable-email-domains) list (CC0) | No SMTP connection is made: `unknown` means nothing is wrong with the address or its domain, not that the mailbox exists. |
| `/api/domain` | The [IANA RDAP bootstrap](https://data.iana.org/rdap/dns.json) and each registry's RDAP server; DNS over HTTPS | `available` means the registry has no record; premium or reserved names can still be unavailable to buy. TLDs without RDAP are inferred from DNS. |
| `/api/solana/token`, `/api/solana/trending`, `/api/solana/wallet` | [Jupiter](https://jup.ag) token, price and holdings APIs, Solana mainnet JSON-RPC (mint account), [GeckoTerminal](https://www.geckoterminal.com) for pools (best effort) | Information only, not financial advice. Nothing is signed or sent. On-chain mint and freeze authority win over the API's audit when both are available. |
| `/api/tech` | The site's home page, headers, cookies and DNS (MX, TXT); 231 own fingerprints (MIT, not derived from Wappalyzer) | No JavaScript is run; a site behind a bot challenge returns what its headers and DNS show. |
| `/api/pdf` | The PDF's text layer, read with [unpdf](https://github.com/unjs/unpdf) (PDF.js) | No OCR: a scanned PDF answers 422 and is not charged. |
| `/api/sitemap` | The site's `robots.txt` and XML sitemaps | Indexes are followed up to 25 child sitemaps per call. |
| `/api/fx` | European Central Bank reference rates via [Frankfurter](https://frankfurter.dev) | Published on working days around 16:00 CET; weekends return the last published day. |
| `/api/translate` | Workers AI `@cf/meta/llama-3.1-8b-instruct-fast` | Machine translation: review