U

Up · CAR Check

by Up

GETBase

$0.01

per call · USD Coin on Base

Evaluate a used car before purchase. Compares the asking price with up to 50 current dealer listings in Canada or the U.S., matched by year, make, model, mileage and optional trim/location. Returns robust median and quartile pricing, deal rating, confidence, sample size and risk flags. Use for used-car price checks, negotiation prep and market comparisons.

Endpoint

GET https://x402-used-car-quickcheck-production.up.railway.app/car-check

1

Calls / 30d

1

Unique payers / 30d

Aug 12

Last called

exact

Payment scheme

Call this service

TypeScript · @x402/fetch
import { wrapFetchWithPayment } from "@x402/fetch";
import { privateKeyToAccount } from "viem/accounts";

const account = privateKeyToAccount(process.env.PRIVATE_KEY);
const fetchWithPay = wrapFetchWithPayment(fetch, account);

const res = await fetchWithPay("https://x402-used-car-quickcheck-production.up.railway.app/car-check", {
  method: "GET",
});
const data = await res.json();
cURL
curl -X GET \
  "https://x402-used-car-quickcheck-production.up.railway.app/car-check?country=CA&make=Tesla&mileage=68000&model=Model+3&price=28000&state=ON&trim=Long+Range&year=2022" \
  -H "X-PAYMENT: <signed x402 payment>"

Example response

{
  "asking_price": 28000,
  "comparables": {
    "analyzed_count": 39,
    "market_total_matches": 116,
    "outliers_removed": 3,
    "raw_count": 42
  },
  "data_freshness": "live",
  "market": {
    "city": null,
    "country": "CA",
    "currency": "CAD",
    "state": "ON"
  },
  "matching": {
    "location_applied": true,
    "mileage_range_km": {
      "maximum": 92140,
      "minimum": 43859
    },
    "trim_applied": true
  },
  "methodology": "Median and quartiles of mileage-matched active dealer asking prices after IQR outlier filtering.",
  "mileage_km": 68000,
  "payment_network": "Base Mainnet",
  "position": {
    "confidence": "HIGH",
    "confidence_score": 84,
    "difference_from_median": -4900,
    "difference_percent": -14.89,
    "estimated_savings_vs_median": 4900,
    "rating": "GOOD DEAL"
  },
  "pricing": {
    "median": 32900,
    "observed_max": 37995,
    "observed_min": 28900,
    "quartile_high": 34995,
    "quartile_low": 30995
  },
  "risk_flags": [],
  "service": "Used Car QuickCheck",
  "vehicle": "2022 Tesla Model 3 Long Range",
  "version": "2.0.0"
}

Payment details

Pay to0x735f74ede4361788d6634925d592711463be8164
AssetUSD Coin · 0x833589fcd6edb6e08f4c7c32d4f71b54bda02913
NetworksBase
Schemesexact

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