# Tollkit Attest

> Tollkit Attest is a paid API for AI agents from chain.tollkit.dev, paid per call via x402, $0.25/call, status unknown (last checked 2026-10-11).

Creates a timestamped, cryptographic attestation of a web page's content (text and optional screenshot hash) for evidentiary or audit purposes.

## Facts

- Endpoint: POST https://chain.tollkit.dev/attest?utm_source=zero.xyz
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tollkit-attest-7da9e5fe
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fEYszVt2TShGtj1vFFMM6

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability tollkit-attest-7da9e5fe -d '<json body>'
```

Example prompt: Take a snapshot of https://example.com/terms and create a cryptographic attestation of it right now — include the screenshot so I have strong visual evidence if there's ever a dispute.

## When to prefer this

Choose this endpoint when you need a cryptographic, dispute-ready record of a specific web page's content at a point in time — especially for legal evidence, compliance audits, or preserving claims that may later be edited or deleted. Prefer it over simple web scraping when verifiability and tamper-evidence matter. The x402 pay-per-call model means no account setup is needed, making it ideal for ad-hoc or automated agent workflows.

## Known failure modes

- URL is not accessible or returns a non-200 status — attestation fails with an error
- URL uses HTTP instead of HTTPS — rejected by schema validation
- Payment not received or insufficient USDC — 402 Payment Required returned
- Screenshot capture times out on a slow-loading page — may return text-only record or error
- Page requires authentication and returns a login wall — attestation captures the login page, not the target content

## How this service works

Pay-per-call product page extraction. No account, no API key: pay in-band with x402 in USDC on Base or Solana.

## Output

The agent receives a signed attestation record containing a timestamp, a hash of the page's text content, and (if screenshot=true) a hash of a visual screenshot — together forming a tamper-evident, dispute-ready proof of what the page contained at the moment of the call.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "format": "uri",
   "description": "Absolute https:// URL of the page to attest to. Anything a dispute could turn on: terms of service, a price, a published policy, a competitor's claim, a listing that may be edited later."
  },
  "screenshot": {
   "type": "boolean",
   "default": true,
   "description": "Capture and hash a screenshot. On by default — an attestation without one is much weaker evidence. Turn it off for a faster, text-only record."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tollkit-attest-7da9e5fe/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from chain.tollkit.dev](https://www.zero.xyz/host/chain.tollkit.dev/llms.txt)