# Declared Publication Relations

> Declared Publication Relations is a paid API for AI agents from www.mahastrategies.com, paid per call via x402, $0.0189/call, status unknown (last checked 2026-10-30).

Returns declared relationships (e.g. dataset links, supplement links, related works) from Crossref metadata for a given DOI, without verifying linked resource availability.

## Facts

- Endpoint: POST https://www.mahastrategies.com/api/v1/intel/publications/declared-relations?utm_source=zero.xyz
- Price: $0.0189/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/declared-publication-relations-795da5f6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ulIfhUjJeERE48MxoduDO

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 declared-publication-relations-795da5f6 -d '<json body>'
```

Example prompt: Can you pull up all the declared relationships in the Crossref metadata for DOI 10.1038/s41586-021-03819-2 using public data — things like linked datasets, supplements, or related works?

## When to prefer this

Use this endpoint when you need to enumerate declared bibliographic or data relationships for a specific publication as recorded in Crossref metadata, without needing to verify or fetch the linked resources themselves. It is appropriate for literature review pipelines, reproducibility audits, and scholarly data-linkage mapping where declared intent (not verified availability) is what matters.

## Known failure modes

- DOI not found in Crossref — returns empty or error response
- Malformed or too-short DOI string — validation error
- No declared relations exist for the given DOI — returns empty relationship list
- Invalid dataClass enum value — schema validation error
- Rate limiting or payment failure via x402 protocol

## How this service works

Return bounded relationships declared in Crossref metadata. Linked resource types, availability and reproducibility are not verified; linked files are not fetched.

## Output

A list of declared relationships from Crossref metadata for the specified DOI, including linked resource types and relation kinds (e.g. is-supplement-to, has-preprint, references-dataset). Resource availability, file contents, and link validity are not verified or fetched.

## 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/declared-publication-relations-795da5f6/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)