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Exhibit402 Dual-Browser Screenshot Certification
x402
Exhibit402 Dual-Browser Screenshot Certification is a paid API for AI agents from exhibit402.dylan-caponi.workers.dev, paid per call via x402, $1/call, status unknown (last checked 2026-10-11).
Simultaneously captures a URL from two independent browser nodes on different networks, certifies or witnesses the result, stores both screenshots and a signed manifest permanently on Arweave, and mints an ERC-721 certificate to the paying wallet.
Price / call$1
Success—
StatusUnknown
How this service works
Proof of publication: permanently prove what a URL served at a moment in time. Two independent standardized browsers on different networks visit your URL at the same instant; if their captures match byte-for-byte, the screenshot is stored permanently on Arweave and minted to your wallet as an NFT certificate containing every observer hash.
Output
Returns immediately with a job ID, status 'processing', a free claim URL to poll every ~15 seconds, and an estimated wait time. Once resolved, the claim ticket contains the certification tier (CERTIFIED if byte-identical, WITNESSED if disagreement detected), Arweave permanent links to both screenshots and the signed manifest, an ERC-721 token ID, a Basescan URL, and cryptographic hashes. Oversize or unreachable URLs trigger a partial refund minus $0.10; service faults refund in full.
Example use cases
Legal evidence of website content
“Capture and certify what https://competitor.com/pricing looks like right now — I need permanent, dual-witnessed proof on Arweave with an NFT certificate minted to 0xDEF456 in case I need it for a dispute.”
Compliance snapshot of regulated page
“Take a certified full-page screenshot of our disclosure page at https://myfintech.com/disclosures today so we have a blockchain-attested record of what it showed, with the signed manifest stored on Arweave.”
NFT certificate of a live webpage
“I want to mint a blockchain certificate proving what https://myportfolio.art looked like today — do a dual-browser certified capture and send the ERC-721 token to wallet 0x789XYZ.”
Technical details
Endpoint
POSThttps://exhibit402.dylan-caponi.workers.dev/capture?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need tamper-proof, independently witnessed evidence of a webpage's state at a specific moment — particularly for legal, compliance, or audit purposes. It is uniquely suited when you require both permanent decentralized storage (Arweave) and a blockchain-backed certificate (ERC-721) rather than just a screenshot file. Prefer it over single-node screenshot services when dual-network independent verification and cryptographic attestation are required.
Side effects
- URL is unreachable — partial refund of $0.90 issued
- Content is screened or blocked by the target site — partial refund issued
- Oversize page exceeds capture limits — partial refund issued
- Service fault on provider side — full refund issued
- Claim ticket poll returns 'processing' indefinitely — retry or contact support
- Invalid wallet address causes certificate minting to fail
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| example | string |
Output
Schema · Response
{
"type": "json",
"example": {
"note": "Poll claim_url (free) every ~15s. Resolves to {tier, ar:// links, token_id, basescan_url, hashes} or a refund per policy.",
"job_id": "6f1c9e2a-4b7d-4c1e-9a2f-3d5e8b7a0c1d",
"status": "processing",
"claim_url": "https://exhibit402.dylan-caponi.workers.dev/claim/6f1c9e2a-4b7d-4c1e-9a2f-3d5e8b7a0c1d",
"check_after_seconds": 15
}
}Tags
x402
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