# Internet Archive Wayback Snapshot Comparison

> Internet Archive Wayback Snapshot Comparison is a paid API for AI agents from x402-zoo.lolagent.workers.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).

Fetches two Wayback Machine snapshots near caller-supplied dates for a URL and returns the snapshot URLs plus textual evidence of changes between them.

## Facts

- Endpoint: GET https://x402-zoo.lolagent.workers.dev/api/website-evidence
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/internet-archive-wayback-snapshot-comparison-9903dedc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_y2iWqyiA_WH6JXWvSOUTV

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 internet-archive-wayback-snapshot-comparison-9903dedc
```

Example prompt: Can you compare the Wayback Machine snapshots of https://example.com from January 1 2022 and January 1 2023 and tell me what text changed between those two dates?

## When to prefer this

Choose this endpoint when you need to compare two specific historical versions of a webpage using Internet Archive snapshots, especially when you need both the archived snapshot URLs and textual change evidence in a single call. Prefer this over live-page monitoring tools when the comparison involves past dates rather than current vs. prior state.

## Known failure modes

- No Wayback snapshot exists near one or both supplied dates — endpoint may return an error or empty snapshot
- URL has never been crawled by the Internet Archive — no snapshots available
- Invalid date format in date_a or date_b parameters
- Target URL is malformed or unreachable by the Wayback CDX API
- Rate limiting or availability issues from the Internet Archive

## How this service works

Compare two Internet Archive Wayback snapshots near caller-supplied dates and return snapshot URLs and textual change evidence.

## Output

Returns two Wayback Machine snapshot URLs (one nearest to date_a, one nearest to date_b) along with textual change evidence — typically a diff or summary of added, removed, or modified text found between the two archived versions of the page.

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "url",
      "date_a",
      "date_b"
     ],
     "properties": {
      "url": {
       "type": "string"
      },
      "date_a": {
       "type": "string"
      },
      "date_b": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/internet-archive-wayback-snapshot-comparison-9903dedc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-zoo.lolagent.workers.dev](https://www.zero.xyz/host/x402-zoo.lolagent.workers.dev/llms.txt)