# Used Car DeepCheck – Pre-Purchase Valuation & Deal Analysis API

> Used Car DeepCheck – Pre-Purchase Valuation & Deal Analysis API is a paid API for AI agents from ideal-eagerness-production-9462.up.railway.app, paid per call via x402, $0.99/call, status unknown (last checked 2026-09-15).

Analyzes a used car listing to determine if the asking price is fair, compares live dealer comparables, and returns a BUY, NEGOTIATE, or WALK AWAY decision with market value estimates for US and Canadian markets.

## Facts

- Endpoint: GET https://ideal-eagerness-production-9462.up.railway.app/deep-check
- Price: $0.99/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/used-car-deepcheck-pre-purchase-valuation-deal-analysis-api-19b58568
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Q-eIlPA-qgaXP8G6_h8k3

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 used-car-deepcheck-pre-purchase-valuation-deal-analysis-api-19b58568
```

Example prompt: Can you deep-check this used car deal for me? It's a 2019 Honda Civic EX, 82000 km, independent dealer is asking $17,500 CAD in Toronto, Ontario, Canada — should I buy it, negotiate, or walk away?

## When to prefer this

Choose this endpoint when an AI agent or buyer needs a structured, decision-ready used car valuation with explicit BUY/NEGOTIATE/WALK AWAY guidance for Canadian or US markets. It is superior to generic price guides when you need live comparable listings, negotiation targets, risk flags, and market turnover data in a single API call. Best suited for pre-purchase decision support where the user has the make, model, year, mileage, and asking price in hand.

## Known failure modes

- Missing required fields (make, model, year, mileage, price) returns a 400 validation error
- Invalid VIN format (not 17 characters) rejected with schema error
- Unsupported country code returns enum validation failure
- No comparable listings found for rare or obscure vehicles may reduce confidence score
- Payment not processed (x402 payment required) returns 402 before any valuation is run
- Mileage value of 0 or implausibly low may skew market comparison results

## How this service works

Used Car DeepCheck is an AI-ready pre-purchase used car valuation, vehicle pricing, and deal analysis API for buyers and agents. Use it before buying a used car to check if the asking price is fair, compare live dealer listings, estimate market value, fair value, negotiation target, and maximum buy price, then return BUY, NEGOTIATE, or WALK AWAY. Supports Canada and U.S. markets with optional VIN, mileage, trim, location, listing history, and market-turnover intelligence.

## Output

Returns a structured JSON object including the vehicle identification, market value, fair value, negotiation target price, maximum buy price, a BUY/NEGOTIATE/WALK AWAY decision, comparable dealer listings, market turnover intelligence, listing history signals, risk flags, confidence score, and methodology/disclaimer notes.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "make",
      "model",
      "year",
      "mileage",
      "price"
     ],
     "properties": {
      "vin": {
       "type": "string",
       "maxLength": 17,
       "minLength": 17,
       "description": "Optional VIN. Enables deeper enrichment when available."
      },
      "zip": {
       "type": "string",
       "description": "Optional ZIP/postal code for local valuation."
      },
      "city": {
       "type": "string",
       "description": "Optional city."
      },
      "make": {
       "type": "string",
       "description": "Vehicle manufacturer."
      },
      "trim": {
       "type": "string",
       "description": "Optional trim for tighter matching."
      },
      "year": {
       "type": "integer",
       "maximum": 2030,
       "minimum": 1980,
       "description": "Vehicle model year."
      },
      "model": {
       "type": "string",
       "description": "Vehicle model."
      },
      "price": {
       "type": "number",
       "description": "Seller asking price in CAD or USD.",
       "exclusiveMinimum": 0
      },
      "state": {
       "type": "string",
       "description": "Optional province/state code."
      },
      "country": {
       "enum": [
        "CA",
        "US"
       ],
       "type": "string",
       "default": "CA",
       "description": "Valuation market."
      },
      "mileage": {
       "type": "integer",
       "minimum": 0,
       "description": "Current odometer reading in kilometres."
      },
      "dealer_type": {
       "enum": [
        "independent",
        "franchise"
       ],
       "type": "string",
       "default": "independent",
       "description": "Dealer classification."
      },
      "is_certified": {
       "type": "boolean",
       "default": false,
       "description": "Certified pre-owned status."
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": 
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/used-car-deepcheck-pre-purchase-valuation-deal-analysis-api-19b58568/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ideal-eagerness-production-9462.up.railway.app](https://www.zero.xyz/host/ideal-eagerness-production-9462.up.railway.app/llms.txt)