# unprice Offer Proof

> unprice Offer Proof is a paid API for AI agents from volkov.evgeny.m2.fvds.ru, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Fetches and validates structured product offer data (price, currency, availability) from a given URL using JSON-LD schema checks

## Facts

- Endpoint: GET https://volkov.evgeny.m2.fvds.ru/pay/offer-proof
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/unprice-offer-proof-c6262cc9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4p_VHkZbJG-cWcrFk2NPR

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 unprice-offer-proof-c6262cc9
```

Example prompt: Can you check whether this product page has valid JSON-LD offer data — price, currency, and availability — and tell me if it passes? The URL is https://example.com/product.

## When to prefer this

Choose this endpoint when you need to programmatically verify that a product page exposes machine-readable offer data (price, currency, availability) via JSON-LD schema.org markup, particularly for e-commerce auditing, competitive price monitoring, or pre-purchase availability checks. Prefer this over raw HTML scrapers when you need structured, validated offer fields rather than raw page content.

## Known failure modes

- URL does not contain any JSON-LD offer schema — checks return fail status
- Target page is behind authentication or bot protection — fetch fails
- URL is malformed or unreachable — returns error
- Product page uses non-standard or proprietary pricing markup not recognized by JSON-LD parser
- Rate limiting or network timeout on the target domain

## How this service works

Tiny paid web services for agents. Pay per request with USDC on Base via x402, plus non-x402 Base USDC tx-hash checkouts for Merchant Feed Audit, Base USDC receipts, and recent wallet statements.

## Output

Returns the product name, offer price, currency, and availability extracted from the page's JSON-LD schema, along with named validation checks (e.g. 'jsonld_offer') and their pass/fail status.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "url": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "url": "https://example.com/product",
  "checks": [
   {
    "name": "jsonld_offer",
    "status": "pass"
   }
  ],
  "product": {
   "name": "Example product",
   "offer": {
    "price": "19.99",
    "currency": "USD",
    "availability": "InStock"
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/unprice-offer-proof-c6262cc9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from volkov.evgeny.m2.fvds.ru](https://www.zero.xyz/host/volkov.evgeny.m2.fvds.ru/llms.txt)