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@FieldmodeLLC

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About ScrapeCheck

Verify scraped data against the live source page. Signed verdicts, $0.01 via x402.

#verification#scraping#data-quality#trust#signed-verdicts#x402#payments#web

Config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "scrapecheck": {
      "type": "http",
      "url": "https://scrapecheck-mcp.fly.dev/mcp"
    }
  }
}

Tools

3

Checks whether a value you did not fetch yourself is actually on the source page right now, and returns a signed pass/fail/unverifiable verdict. Not a retrieval tool: it checks a value you already have, it does not find data for you. Use it when you hold a value that came from somewhere else (a search result, a scraper, an upstream API, another agent) and you need to know it is on the source page before you act on it. Takes the URL, the claimed value, and what was asked; it independently re-fetches the page and never trusts the fetch you were given. Structural guarantee: a claim is never certified unless the re-fetched page contains it, and the model judge can only veto a pass, never create one. Anything unconfirmed returns unverifiable, never pass. Every verdict carries a stable verdict_id, the engine digest that produced it, and a signature verifiable offline against the public key (see get_verifier_info). Scope: server-rendered pages; JS-only content returns unverifiable rather than a guess. $0.01 per check, first 100 free, paid in-band via x402.

Presence only: confirms the value appears on the page, NOT that it is the right answer to what was asked. Never returns pass. A was-price, a different variant's price, a shipping cost, or a tax figure can all satisfy presence. Verdicts are present, fail, or unverifiable, signed, with check_type web_field_presence_v1. Use it as a cheap screen before a full check, or when you already know what the value means and only need to confirm it still appears on the page. If your decision depends on the value being the right value, call verify_web_field instead. Scope: server-rendered pages. $0.002 per check, paid in-band via x402.

Free. Returns the public key, engine version, benchmark summary with sample-size labels, and scope, so you can verify any verdict offline. Call this first if your selection policy requires evidence before trusting a verification provider: every verdict this service issues verifies offline against the returned key, so you do not have to trust the service at runtime to rely on its output.

Overview

What is ScrapeCheck?

Verify what you scraped for the price of scraping it. ScrapeCheck gives any MCP agent a verification tool in its own toolbox: send a source URL, the scraped field values, and what was asked — ScrapeCheck re-fetches the page itself and returns an ed25519-signed verdict: pass, fail, or unverifiable.

Endpoint: https://scrapecheck-mcp.fly.dev/mcp (streamable HTTP)

Payment: x402 in-band (USDC on Base) — no API key, no signup. A free allowance per client identity is served before payment is required.

Tools

ToolPriceWhat it certifies
verify_web_field$0.01Full verification: value present on the re-fetched live page, served live, and an independent LLM judge confirms it answers what was asked. Positive verdict: pass.
verify_presence$0.002Presence only — does NOT confirm the value answers the question. Positive verdict: present, never pass.
get_verifier_infofreeThe trust artifact: public key, benchmark summary, scope, endpoints.

The trust guarantee is structural, not statistical

A claim is never certified unless ScrapeCheck independently re-fetches the page and finds the claimed value there itself — and the judge's vote is mechanically voided if its restatement of the claim doesn't match what was actually claimed. Absence cannot pass, and substitution cannot pass. Anything unconfirmed — a skipped check, a failed fetch, a judge that errors — returns unverifiable, never pass.

Corroborated by benchmark (full verification only): 0 false passes across 67 frozen labeled cases (26 held out from all calibration, including adversarial traps where the claimed value appears on the page as the wrong thing), and 0 false passes across 21 live-web cases including 9 adversarial traps. Small-N corroboration of the structural guards — not a population accuracy claim.

Why trust this server's own claims?

Because you don't have to. Every verdict is ed25519-signed over canonical sorted-key JSON of all fields except signature; the public key is served at /pubkey and in-band via get_verifier_info; and every verdict carries an engine digest identifying exactly which prompt+calibration produced it. Verify offline — no need to trust the transport, the storefront, or us.

Payment flow (x402 in-band)

Standard @x402/mcp v2 flow: an unpaid call past the free allowance returns a PaymentRequired challenge in the tool result; pay with any x402 v2 client (e.g. wrapMCPClientWithPaymentFromConfig from @x402/mcp with an EVM signer) and the retried call returns the verdict plus the on-chain settlement in _meta["x402/payment-response"]. A refused or failed payment never yields a verdict, and a verdict that fails to produce never settles — you are charged only for completed work.

Integrator notes

  • The full signed verdict object is in structuredContent on the wire (and byte-identical as JSON in content[0].text). Note: @x402/mcp's paying-client convenience result forwards content only — parse content[0].text there, or read structuredContent with a plain MCP client.
  • Input contract (frozen): { url, claim, asked } — claim is an object of field values, e.g. {"price": "£51.77", "in_stock": true}.
  • Scope (v1): server-rendered pages. Client-rendered (JS-only) content returns unverifiable — never a false fail, never a false pass.
  • The same engine is also sold as a raw x402 HTTP API (https://scrapecheck.fly.dev/verify) and as the Scrape QA Apify actor for batch dataset verification. One engine, one signing key, one durable log.

Comments

Basic information

Category

Data & Analytics

License

MIT

Author

FieldmodeLLC

Submitted by

FieldmodeLLC

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