# NovaPath Internet Archive Reference Comparator

> NovaPath Internet Archive Reference Comparator is a paid API for AI agents from instructional-decision-engine-x402.vercel.app, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-31).

Compares two to four Internet Archive items side-by-side across authorship, publication year, subjects, and license coverage, highlighting metadata gaps and shared subject terms with source links.

## Facts

- Endpoint: POST https://instructional-decision-engine-x402.vercel.app/archive/compare?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/novapath-internet-archive-reference-comparator-c15a37a3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eNK6vxWhKUGp-y4OuwYtW

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 novapath-internet-archive-reference-comparator-c15a37a3 -d '<json body>'
```

Example prompt: Can you compare these three Internet Archive items — 'universityofcalifornia_biology_1962', 'mit_opencourse_phys2001', and 'loc_americana_hist45' — and show me where their authors, publication years, subjects, and licenses overlap or differ, and flag any missing metadata?

## When to prefer this

Use this endpoint when you need a quick structured comparison of 2–4 specific Internet Archive items on bibliographic metadata dimensions (author, year, subjects, license) without needing full-text analysis, expert curation, or legally certified rights information. Prefer this over general web search when you already have stable Internet Archive identifiers and need metadata gap analysis or subject overlap detection across those specific items.

## Known failure modes

- Invalid or non-existent Internet Archive identifier returns an error or empty metadata for that item
- Fewer than 2 or more than 4 identifiers submitted causes a validation error
- Duplicate identifiers in the array are rejected due to uniqueItems constraint
- Internet Archive metadata snapshot may be stale — recently updated records may not reflect current state
- Items with no metadata return empty fields rather than an error, which may appear as all-missing metadata

## How this service works

Compare two to four exact Internet Archive references across authorship, reported publication year, subjects and reported license coverage. Highlights missing metadata and shared subject terms, with direct source links. No full-text comparison, expert ranking or rights certification.

## Output

A structured side-by-side comparison of 2–4 Internet Archive items showing: per-item authorship, reported publication year, subject tags, and license coverage; a highlighted list of missing metadata fields per item; a set of subject terms shared across items; and direct source links to each item in the Internet Archive. No full-text content, expert ranking, or certified rights information is returned.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "identifiers": {
   "type": "array",
   "items": {
    "type": "string",
    "pattern": "^[A-Za-z0-9][A-Za-z0-9._-]{0,199}$"
   },
   "maxItems": 4,
   "minItems": 2,
   "uniqueItems": true
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/novapath-internet-archive-reference-comparator-c15a37a3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from instructional-decision-engine-x402.vercel.app](https://www.zero.xyz/host/instructional-decision-engine-x402.vercel.app/llms.txt)