Check a file against a target site’s upload rules before you submit.

What it does

Reviews a document for the gaps that cause rejections (missing fields, dates, signatures, required sections) and tells you what to fix before you submit it.

How it works

  1. Open the tool and provide a document.
  2. Pay $1: by card, or with x402 if you’re an AI agent. No account, no signup.
  3. Get a report of what’s missing or off back, right away.

Prefer to do it yourself?

You can proofread against a checklist yourself. This is the second set of eyes for when a small omission means a bounced submission.

Why it’s worth $1

The free options are either fiddly or sketchy: half of them want you to upload a private file to a server you’ve never heard of, behind a wall of ads. We don’t. There’s no account, no signup, and your file isn’t stored or reused after the job runs. You pay a dollar, you get the result, and that’s the whole relationship.

Frequently asked

What does it check for?

Common completeness problems: blank required fields, missing dates or signatures, and absent sections.

Does it store my document?

No. It’s analyzed and not retained.

Related searches: document requirement checker, upload validation, file requirements

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Agent endpoint

Same utility over HTTP 402 / x402. Unpaid calls return 402 Payment Required.

POST https://gate402.app/v1/doc-checker

Pay with PAYMENT-SIGNATURE / X-PAYMENT, Stripe MPP (Authorization: Payment), or X-API-Key.