# Best Price — Cross-Retailer Lowest Price Finder

> Best Price — Cross-Retailer Lowest Price Finder is a paid API for AI agents from api.syntalic.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Finds the lowest current price for a product across Amazon, Walmart, Costco, Home Depot, Nordstrom, and IKEA in the US or Canada, returning the cheapest option plus comparison prices from other retailers.

## Facts

- Endpoint: GET https://api.syntalic.com/v1/shopper/best-price
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402, shopping
- Canonical page: https://www.zero.xyz/c/best-price-cross-retailer-lowest-price-finder-60e1e512
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dxhkW6joeF_9k5grPHOAJ

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 best-price-cross-retailer-lowest-price-finder-60e1e512
```

Example prompt: What's the cheapest place to buy AirPods Pro right now in the US — check Amazon, Walmart, Costco, and the other major retailers and tell me the best price and where else I can find it.

## When to prefer this

Use this endpoint when you need a real-time lowest price across major US or Canadian retailers (Amazon, Walmart, Costco, Home Depot, Nordstrom, IKEA) for a specific product or keyword. Prefer this over general web search for shopping when you want structured price data with in-stock status, condition, and savings percentage in a single call. Ideal for price-aware purchasing decisions, deal detection, and quick cross-retailer arbitrage checks.

## Known failure modes

- No results found for query — product not carried by any covered retailer
- Invalid country code — must be 'us' or 'ca'
- Invalid retailer filter — must be one of the six supported retailers
- Query too short or empty — minimum 1 character required
- Retailer scrape temporarily unavailable — partial results returned
- Product out of stock at all retailers — in_stock false across all results

## How this service works

Find the lowest current price for a product across Amazon, Walmart, Costco, Home Depot, Nordstrom, and IKEA in US and Canada. Returns the cheapest option plus other retailer prices for comparison.

## Output

Returns the single best (lowest) price found, including retailer name, product name, exact price, currency, in-stock status, product condition (new/refurbished/used/unknown), list price, savings percentage, and the datetime it was scraped. Also returns an array of other retailer prices for comparison, each with retailer, price, in-stock status, and condition.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "q"
 ],
 "properties": {
  "q": {
   "type": "string",
   "example": "airpods",
   "minLength": 1,
   "description": "Search query (product name, keyword, or category term)"
  },
  "limit": {
   "type": "integer",
   "default": 10,
   "example": 10,
   "maximum": 50,
   "description": "Max results to return (default 10, max 50)"
  },
  "country": {
   "enum": [
    "us",
    "ca"
   ],
   "type": "string",
   "default": "us",
   "example": "us",
   "description": "Country (us or ca)"
  },
  "retailer": {
   "enum": [
    "amazon",
    "walmart",
    "costco",
    "homedepot",
    "nordstrom",
    "ikea"
   ],
   "type": "string",
   "example": "amazon",
   "description": "Filter to a specific retailer"
  }
 },
 "additionalProperties": false
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "query": {
   "type": "string"
  },
  "country": {
   "type": "string"
  },
  "currency": {
   "type": "string"
  },
  "best_price": {
   "type": "object",
   "properties": {
    "price": {
     "type": "number"
    },
    "in_stock": {
     "type": "boolean"
    },
    "retailer": {
     "type": "string"
    },
    "condition": {
     "enum": [
      "new",
      "refurbished",
      "used",
      "unknown"
     ],
     "type": "string",
     "description": "Derived from product name + retailer URL signals (e.g. Walmart 'Restored', Amazon Renewed). Defaults to 'new' when no condition signal is present."
    },
    "list_price": {
     "type": "number",
     "nullable": true
    },
    "scraped_at": {
     "type": "string",
     "format": "date-time"
    },
    "savings_pct": {
     "type": "number",
     "nullable": true
    },
    "product_name": {
     "type": "string"
    }
   }
  },
  "other_prices": {
   "type": "array",
   "items": {
    "type": "object",
    "properties": {
     "price": {
      "type": "number"
     },
     "in_stock": {
      "type": "boolean"
     },
     "retailer": {
      "type": "string"
     },
     "condition": {
      "enum": [
       "new",
       "refurbished",
       "used",
       "unknown"
      ],
      "type": "string"
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/best-price-cross-retailer-lowest-price-finder-60e1e512/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.syntalic.com](https://www.zero.xyz/host/api.syntalic.com/llms.txt)