Presence check (not an answer check)
verify_presenceConfirm a scraped value appears on the live page, not whether it's the correct answer. Use it as a low-cost screen before full verification, or to check a value is still present.
Instructions
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.
Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| url | Yes | URL of the source page the claim was scraped from | |
| asked | Yes | What the scraper was asked to extract, e.g. "get the current price and stock status" | |
| claim | Yes | The scraped field(s) to verify against the live page, e.g. {"price": "£51.77", "in_stock": true} |
Output Schema
| Name | Required | Description | Default |
|---|---|---|---|
| engine | Yes | ||
| reasons | Yes | ||
| verdict | Yes | ||
| evidence | Yes | ||
| signature | Yes | ||
| check_type | Yes | ||
| confidence | Yes | ||
| verdict_id | Yes |