# Foundry VIN Pair Attribute Comparison

> Foundry VIN Pair Attribute Comparison is a paid API for AI agents from foundry-par007-machine-revenue-mainnet.inference-chip-index.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Compares NHTSA manufacturer-reported attributes between two VINs side-by-side, returning structured evidence with source provenance for each vehicle.

## Facts

- Endpoint: POST https://foundry-par007-machine-revenue-mainnet.inference-chip-index.workers.dev/v2/official/vin-pair-attribute-comparison
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/foundry-vin-pair-attribute-comparison-f7e29586
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5yBGeTsuXUyG2gS6N4-Sq

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 foundry-vin-pair-attribute-comparison-f7e29586 -d '<json body>'
```

Example prompt: Compare the NHTSA specs for VINs 1HGCM82633A004352 and 5UXWX7C50BA000000 side by side — I want to see if they have the same make, model, year, and body class, with source evidence included.

## When to prefer this

Use this endpoint when you need a structured, evidence-backed side-by-side comparison of two VINs from NHTSA's authoritative vPIC database, with full source provenance and freshness metadata. Prefer this over single-VIN decode endpoints when the use case explicitly requires comparing two vehicles — e.g. fraud detection, duplicate checking, spec verification, or procurement matching. The included provenance and freshness fields make it suitable for compliance or audit workflows where data lineage matters.

## Known failure modes

- Invalid VIN format (not 17 chars or contains I/O/Q) — input schema validation error
- VIN not found in NHTSA vPIC — returns null attribute fields with error code
- NHTSA upstream service unavailable — returns service error
- Payment not processed — HTTP 402 before request is fulfilled
- Partial decode — one VIN decodes cleanly, other does not (decode_clean: false)

## How this service works

Pay-per-request evidence and data tools: CSV validation and reconciliation, DNS/email configuration evidence, and bounded official weather, earthquake, vehicle, company and study records. Exact USDC prices, explicit JSON contracts and source provenance. No mailbox, ownership, medical or safety guarantees.

## Output

A JSON object containing an array of two vehicle entries, each with the decoded VIN, full NHTSA vPIC attribute fields (make, model, year, body class, vehicle type, manufacturer, engine cylinders, fuel type, electrification level, error codes), decode_clean flag, and structured evidence including source URL, retrieval freshness state, cache age, provenance license, attribution, limitations, and upstream call count.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "left_vin": {
   "type": "string",
   "pattern": "^[A-HJ-NPR-Z0-9]{17}$"
  },
  "right_vin": {
   "type": "string",
   "pattern": "^[A-HJ-NPR-Z0-9]{17}$"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "route": "vin-pair-attribute-comparison",
  "result": {
   "vehicles": [
    {
     "vin": "1HGCM82633A004352",
     "evidence": {
      "query": {
       "vin": "5UXWX7C5*BA0",
       "model_year": 2011
      },
      "source": "NHTSA vPIC",
      "freshness": {
       "state": "CURRENT_RETRIEVAL",
       "retrievedAt": "2026-09-06T00:00:00Z",
       "cacheAgeSeconds": 0,
       "maximumCacheSeconds": 0,
       "recordAgeIsNotRetrievalAge": true
      },
      "sourceUrl": "https://vpic.nhtsa.dot.gov",
      "observedAt": "2026-09-06T00:00:00Z",
      "provenance": {
       "license": "Public vPIC Open Data API; no licensing or registration requirement",
       "termsUrl": "https://vpic.nhtsa.dot.gov/api/Home/Index/FAQ",
       "truncated": false,
       "attribution": "NHTSA vPIC; manufacturer-reported vehicle attributes",
       "limitations": [
        "Synthetic example only; identifiers and null values illustrate fields, not a live observation."
       ],
       "modifications": "Selected factual fields, normalized names and bounded result count; no source ownership claimed.",
       "upstreamCalls": 1,
       "documentationUrl": "https://vpic.nhtsa.dot.gov/api/"
      },
      "sourceUpdatedAt": null,
      "normalizedResult": [
       {
        "VIN": null,
        "Make": null,
        "Model": null,
        "BodyClass": null,
        "ErrorCode": null,
        "ErrorText": null,
        "ModelYear": null,
        "VehicleType": null,
        "Manufacturer": null,
        "EngineCylinders": null,
        "FuelTypePrimary": null,
        "ElectrificationLevel": null
       }
      ],
      "sourceProcessedAt": null,
      "rawSourceIdentifiers": []
     },
     "decode_clean": false
    },
    {
     "vin": "5UXWX7C50BA000000",
     "evidence": {
      "query": {
       "vin": "5UXWX7C5*BA0",
       "model_year": 2011
      },
      "source": "NHTSA vPIC",
      "freshness": {
       "state": "CURRENT_RETRIEVAL",
       "retrievedAt": "2026-09-06T00:00:00Z",
       "cacheAgeSeconds": 0,
       "maximumCacheSeconds": 0,
       "recordAgeIsNotRetrievalAge": true
      },
      "sourceUrl": "https://vpic.nhtsa.dot.gov",
      "observedAt": "2026-09-06T00:00:00Z",
      "provenance": {
       "license": "Public vPIC Open Data API; no licensing or registration requirement",
       "termsUrl": "https://vpic.nhtsa.dot.gov/api/Home/Index/FAQ",
       "truncated": false,
       "attribution": "NHTSA vPIC; manufacturer-repo
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/foundry-vin-pair-attribute-comparison-f7e29586/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from foundry-par007-machine-revenue-mainnet.inference-chip-index.workers.dev](https://www.zero.xyz/host/foundry-par007-machine-revenue-mainnet.inference-chip-index.workers.dev/llms.txt)