# Wayback Machine Availability Check

> Wayback Machine Availability Check is a paid API for AI agents from wayback-x402.vercel.app, paid per call via x402, $0.002/call, status down (last checked 2026-10-12, last successful call 2026-05-04).

Checks whether a URL has been archived by the Wayback Machine and returns the closest snapshot to a given timestamp

## Facts

- Endpoint: GET https://wayback-x402.vercel.app/wayback/check?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: down
- Last checked: 2026-10-12
- Last successful call: 2026-05-04
- Success rate: 100% of calls made through Zero
- Rating: 5.0 / 5 from 1 review
- Activations on Zero: 1
- Tags: x402
- Canonical page: https://www.zero.xyz/c/wayback-x402-vercel-app-1d39b6d8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3PRI8cdGx2phK-kY-b_Fk

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 wayback-x402-vercel-app-1d39b6d8
```

Example prompt: Can you check if https://oldsite.com was archived by the Wayback Machine around January 15, 2020 — I want to know if a snapshot exists from that time and where to find it.

## When to prefer this

Use this endpoint when you need to verify whether a specific URL was archived at or near a particular point in time, especially for fact-checking historical claims, confirming a page existed before it was taken down, or retrieving a snapshot reference. Prefer this over the summary or history endpoints when you only need a single point-in-time availability check rather than a full archive history.

## Known failure modes

- URL not archived — returns available: false with null snapshot
- Invalid timestamp format — query may return latest snapshot instead of targeted one
- Wayback Machine CDX API unavailable — upstream timeout or error
- Missing required 'url' parameter — returns validation error
- Rate limiting or x402 payment failure — returns 402 Payment Required

## How this service works

Wayback Machine availability check. Returns whether a URL has been archived and the closest snapshot to a given timestamp. Use to verify if a page existed at a specific point in time.

## Output

Returns a JSON object with: 'available' boolean indicating whether a snapshot exists, 'url' of the queried page, 'snapshot' object with the closest archive metadata, 'wayback_url' pointing to the Wayback Machine page for that URL, and 'requested_timestamp' echoing the input timestamp.

## Example request

```json
{
 "input": {
  "type": "http",
  "method": "GET",
  "queryParams": {
   "url": "https://www.wikipedia.org",
   "timestamp": "20190601"
  }
 }
}
```

## 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"
     ],
     "properties": {
      "url": {
       "type": "string",
       "description": "URL to check (required)"
      },
      "timestamp": {
       "type": "string",
       "description": "Target timestamp YYYYMMDD or YYYYMMDDHHMMSS (optional, default: latest)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "url": {
       "type": "string"
      },
      "snapshot": {
       "type": "object"
      },
      "available": {
       "type": "boolean"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/wayback-x402-vercel-app-1d39b6d8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from wayback-x402.vercel.app](https://www.zero.xyz/host/wayback-x402.vercel.app/llms.txt)