FastAF’s Amazon endpoint returns Amazon product data as JSON, so an agent or a cron job can check prices on a schedule without running its own scraper. You pay per call (x402, $0.003 per call per our OpenAPI) or start with 500 free credits every month after email verification.

## How it works

1.  Call `GET https://api.fastaf.co/x402/v1/amazon` (or the MCP tool `amazon_product`) with resource=product, an ASIN and marketplace domain (or resource=search with query).
2.  Store the price fields you care about.
3.  Re-run on your schedule and alert on changes.

Pair it with `/x402/v1/walmart`, `/x402/v1/ebay` and `/x402/v1/shopping` (Google Shopping) to compare the same product across stores.

## Honest comparison

FastAF does not store price history or send alerts: you schedule the calls and keep the history. Dedicated price-tracking SaaS tools include dashboards and alerts out of the box; FastAF is the data layer for agents and developers who want to build their own.

## Pricing

**Pricing:** 500 free credits every month after email verification; x402 pay-per-call from $0.003; optional prepaid credit packs from $10 for 20,000 credits, without expiry.

Pricing source: [FastAF OpenAPI](https://api.fastaf.co/openapi.json), read October 27, 2026. Live payment challenges are authoritative.

Amazon product/search calls use 1 API-key credit. The live x402 challenge is 3000 atomic USDC ($0.003), verified October 27, 2026.

## How should an agent track prices?

Request resource=product with an ASIN and marketplace domain. Store the source URL, timestamp, marketplace and displayed currency with each observation; price is a display string, so parse it carefully.

## What should you validate?

Check returned fields before using them in an agent decision. Missing fields are not evidence of zero values; preserve provenance and use bounded retries.

## How do you make a real request?

This example calls [Amazon API](/apis/amazon-api/) using its documented input. Save the API key from the signup email, confirm your email and set FASTAF\_API\_KEY in your server environment.

```
curl --fail-with-body -H "Authorization: Bearer $FASTAF_API_KEY" 'https://api.fastaf.co/v1/amazon?resource=product&asin=B07FZ8S74R&domain=com'
```

```
# pip install fastaf-sdk
import os
from fastaf import FastAF

with FastAF(os.environ["FASTAF_API_KEY"]) as client:
    data = client.request("amazon", {"resource":"product","asin":"B07FZ8S74R","domain":"com"})
    print(data)
```

Amazon product JSON for resource=product: ASIN, title, displayed price, availability\_status, average\_rating and total\_reviews. Other resource modes return their own search, offer or bestseller data.

The example costs 1 credits after the trial. Alternatively, this endpoint costs $0.003 per successful x402 call at the default configuration; FastAF x402 calls start at $0.003. These are separate billing modes.

For x402, request the same parameters under `/x402/v1/amazon` without an API key, validate the live PAYMENT-REQUIRED challenge, then sign and retry with a payment-aware client. A bare curl request returns HTTP 402 and does not pay; unsupported higher-cost options require API-key billing.

## Frequently asked questions

### Do I need an Amazon account or API key?

No. You need a FastAF account (500 free credits every month after email verification) or an x402 wallet, nothing from Amazon.

### Does FastAF keep price history?

No. Each call returns current data; storing history is up to you.

### Can an AI agent call it directly?

Yes, through the hosted MCP server at https://api.fastaf.co/mcp (tool \`amazon\_product\`) or via x402 HTTP calls.

### Which other stores are covered?

Walmart, eBay and Google Shopping have their own endpoints. See the docs for parameters.

### How much does the example cost?

The API-key example uses 1 credits per successful call after the trial. This endpoint has a default x402 price of $0.003 per successful call in USDC on Base; the live payment challenge is authoritative.

### Does the SDK automatically pay an HTTP 402?

No. The API-key SDK does not sign wallet payments; x402 requires an explicitly configured payment-aware client and a funded wallet.

## Try it on your own request

500 free credits every month after email verification, no card.

[Start free](/signup/)

## Related

*   [the Amazon API behind this](/apis/amazon-api/)
*   [Job Listings Aggregation API](/use-cases/google-jobs-api-for-agents/)
*   [eBay sold listings API for agents](/use-cases/ebay-sold-listings-api/)