# Publication Update Snapshot

> Publication Update Snapshot is a paid API for AI agents from www.mahastrategies.com, paid per call via x402, $0.010062/call, status unknown (last checked 2026-10-17).

Retrieves exact-DOI Crossref update metadata with source hashes to identify corrections, retractions, or other publication changes for a given paper.

## Facts

- Endpoint: POST https://www.mahastrategies.com/api/v1/intel/publications/updates?utm_source=zero.xyz
- Price: $0.010062/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/publication-update-snapshot-7bf60260
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LZhaIMyoW3zoldeX1I4De

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 publication-update-snapshot-7bf60260 -d '<json body>'
```

Example prompt: Can you pull the Crossref update metadata for DOI 10.1038/s41586-020-2649-2 using public data and tell me if there are any retraction or correction notices, along with the source hashes?

## When to prefer this

Use this endpoint when you need exact-DOI resolution against Crossref update records with source-hash provenance for a single paper, especially in research integrity workflows, citation verification pipelines, or academic due-diligence checks. Prefer this over general retraction-checking services when source hashing and Crossref-native metadata fidelity are required. Note that missing notices do not confirm a paper's integrity — use results as one signal among many.

## Known failure modes

- DOI not found in Crossref — returns empty or null update records
- DOI format invalid or too short — input validation error
- dataClass enum value not recognized — schema validation failure
- Crossref upstream unavailable — service timeout or error
- No update notices exist for a valid DOI — returns empty result (not an error)

## How this service works

Read exact-DOI Crossref update metadata with source hashes. Missing notices do not prove that a paper is unretracted.

## Output

Returns structured Crossref update metadata for the specified DOI, including source hashes that allow verification of metadata provenance. May include correction, retraction, expression-of-concern, or other editorial update notices. Explicitly notes that absence of a notice does not confirm a paper is unretracted.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "doi": {
   "type": "string",
   "maxLength": 240,
   "minLength": 6
  },
  "dataClass": {
   "enum": [
    "public",
    "synthetic"
   ],
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/publication-update-snapshot-7bf60260/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from www.mahastrategies.com](https://www.zero.xyz/host/www.mahastrategies.com/llms.txt)