ToolVet
75trust / 100

Price Check

by Price Watcher API in Developer tools

x402 APIPassing, checked 2 h ago

Real-time product price lookup from a public e-commerce product URL. Use for product price checks, price monitoring, price comparison, shopping agents, ecommerce research, retail workflows, deal finding, and target-price tracking.

POST
https://e-commerce-price-monitoring-production.up.railway.app/v1/price/check
Price
$0.02
per call in USDC
Uptime
100%
last 30 days
Response time
361 ms
503 ms slowest 5%
Last check
Passed
2 h ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed · Watch with other listings

How to call it

POST https://e-commerce-price-monitoring-production.up.railway.app/v1/price/check

Each call costs $0.02 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

POST https://e-commerce-price-monitoring-production.up.railway.app/v1/price/check
content-type: application/json

{
  "threshold": 20,
  "url": "https://www.sephora.com/product/example-product"
}

Parameters

ParameterTypeRequiredDescription
thresholdnumberNoOptional target price. If provided, the response indicates whether the current product price is at or below this amount.
urlstring (uri)YesPublic e-commerce product page URL to inspect.

Example response

The provider's example. We can't check it without paying.

{
  "belowThreshold": true,
  "currency": "USD",
  "ok": true,
  "price": 18,
  "threshold": 20,
  "title": "Example Product",
  "url": "https://www.sephora.com/product/example-product"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.02.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://e-commerce-price-monitoring-production.up.railway.app/v1/price/check' \
  -H 'content-type: application/json' \
  --data-raw '{"threshold":20,"url":"https://www.sephora.com/product/example-product"}'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - -X POST 'https://e-commerce-price-monitoring-production.up.railway.app/v1/price/check' \
  -H 'content-type: application/json' \
  --data-raw '{"threshold":20,"url":"https://www.sephora.com/product/example-product"}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fe-commerce-price-monitoring-production.up.railway.app%2Fv1%2Fprice%2Fcheck&method=POST
const res = await pay("https://e-commerce-price-monitoring-production.up.railway.app/v1/price/check", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "threshold": 20,
    "url": "https://www.sephora.com/product/example-product"
  }),
});
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://e-commerce-price-monitoring-production.up.railway.app/v1/price/check",
        json={
            "threshold": 20,
            "url": "https://www.sephora.com/product/example-product",
        },
    )
    print(res.status_code, res.text)

Security scan

No findings

We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
2 h agoPassed402358 ms$0.02
6 h agoPassed402336 ms$0.02
11 h agoPassed402409 ms$0.02
16 h agoPassed402381 ms$0.02
21 h agoPassed402389 ms$0.02
Show 10 older checks
25 h agoPassed402395 ms$0.02
30 h agoPassed402503 ms$0.02
34 h agoPassed402362 ms$0.02
38 h agoPassed402341 ms$0.02
42 h agoPassed402365 ms$0.02
47 h agoPassed402376 ms$0.02
2 days agoPassed402334 ms$0.02
2 days agoPassed402352 ms$0.02
2 days agoPassed402367 ms$0.02
3 days agoPassed402451 ms$0.02