# HALOWERK API Design Discussion Snapshot Compare

> HALOWERK API Design Discussion Snapshot Compare is a paid API for AI agents from medien.halowerk.com, paid per call via x402, $0.031/call, status unknown (last checked 2026-10-16).

Compares a caller-supplied previous snapshot of timestamped API design discussion passages against the current live index and returns exact textual change witnesses.

## Facts

- Endpoint: POST https://medien.halowerk.com/v1/baumarkt/media/engineering-api-literal-index/snapshot-compare?utm_source=zero.xyz
- Price: $0.031/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-api-design-discussion-snapshot-compare-3951341c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_D5_Jsp6_9dotTdkCIN2u8

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 halowerk-api-design-discussion-snapshot-compare-3951341c -d '<json body>'
```

Example prompt: Compare my saved snapshot of API design discussion passages against the current live index — specifically searching for 'REST versioning strategy' — and tell me exactly which passages have changed, been added, or removed since my snapshot.

## When to prefer this

Choose this endpoint when you need to detect precise literal textual changes in API design discussion passages between a known baseline and the current live index. It is ideal for monitoring API documentation drift, auditing discussion archives for integrity, or tracking evolving consensus on specific API design topics using exact vocabulary matching rather than semantic search.

## Known failure modes

- Baseline snapshot format invalid or malformed — returns parse error
- Literal keyword query returns no current results — empty change witnesses
- Snapshot is too large and exceeds bounded payload limits — returns size error
- Network timeout fetching current index — returns timeout error
- Mismatched snapshot schema version — returns compatibility error

## How this service works

Compare Timestamped source search for API design discussion passages; literal vocabulary only. against a bounded caller-supplied previous snapshot and return exact change witnesses. Baseline is caller supplied and is never authenticated as historical server output. Pure bounded timing/source-quote validation runs before payment. Exactly one current motor call, zero baseline provider calls. Full current provider disclosure retained; baseline is not submitted to the provider.

## Output

A JSON object containing exact change witnesses — textual diffs of passages that have been added, modified, or removed between the caller-supplied baseline snapshot and the current live index results for the given literal keyword query, along with source timestamps for each current match.

## Response schema (JSON Schema)

```json
{
 "type": "json"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-api-design-discussion-snapshot-compare-3951341c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from medien.halowerk.com](https://www.zero.xyz/host/medien.halowerk.com/llms.txt)