# SYNTHORA Wayback Availability

> SYNTHORA Wayback Availability is a paid API for AI agents from wayback.hergertsynthora.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Checks whether a given URL is archived in the Wayback Machine and returns the closest available snapshot timestamp and link

## Facts

- Endpoint: POST https://wayback.hergertsynthora.com/service
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synthora-wayback-availability-641f92c4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VPtQDQhQ8xWrbX8IjUJiM

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 synthora-wayback-availability-641f92c4 -d '<json body>'
```

Example prompt: Can you check if https://example.com/old-article has ever been archived in the Wayback Machine and give me the closest snapshot link?

## When to prefer this

Use this endpoint when you need to quickly verify whether a specific URL has been captured by the Internet Archive's Wayback Machine and retrieve a direct link to that snapshot. It is ideal for content history verification, fact-checking archived sources, recovering deleted pages, or auditing historical web content. Prefer it over manual Wayback Machine browsing when working in an automated agent pipeline that needs a programmatic, structured response about a URL's archival status.

## Known failure modes

- URL not archived — returns archived: false with null closest_snapshot
- Malformed or missing URL input — request fails with validation error
- Wayback Machine API unavailable — upstream service timeout or error
- Invalid URL format passed — may return error or no results
- Network timeout when reaching archive.org — upstream dependency failure

## How this service works

Check if a URL is archived in the Wayback Machine and get the closest snapshot timestamp and link. Content-history verification for agents. $0.01 USDC via x402. First 3 calls FREE per wallet — send header X-WALLET: 0x<addr>. No charge on upstream failure.

## Output

Returns a JSON object indicating whether the URL is archived (boolean), the closest available snapshot timestamp, and a direct link to that snapshot on the Wayback Machine. If no archive exists, the closest_snapshot field is null.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "description": "url"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "niche": "wayback",
  "result": {
   "url": "https://example.com",
   "archived": false,
   "closest_snapshot": null
  },
  "provenance": {
   "url": "https://archive.org/wayback/available",
   "source": "Wayback Availability"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synthora-wayback-availability-641f92c4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from wayback.hergertsynthora.com](https://www.zero.xyz/host/wayback.hergertsynthora.com/llms.txt)