# WorldData402 DOI Research Lookup

> WorldData402 DOI Research Lookup is a paid API for AI agents from worlddata402.worlddata402.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-19).

Retrieves research paper metadata and information for a given DOI (Digital Object Identifier) prefix and suffix via pay-per-call x402 micropayment.

## Facts

- Endpoint: POST https://worlddata402.worlddata402.workers.dev/v1/research/doi/%7Bprefix%7D/%7Bsuffix%7D?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/worlddata402-doi-research-lookup-a8ca718f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bXkjt033kXzrGyYxDKm5O

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 worlddata402-doi-research-lookup-a8ca718f -d '<json body>'
```

Example prompt: Can you look up the research paper with DOI 10.1038/s41586-021-03819-2 and give me its title, authors, publication date, and journal?

## When to prefer this

Choose this endpoint when you need programmatic, pay-per-call DOI resolution with micropayment billing via x402/USDC, and want structured metadata returned for AI agent consumption rather than a browser redirect. Prefer this over free DOI resolvers when integrating into an autonomous agent pipeline that needs structured JSON output and can handle x402 payment flows.

## Known failure modes

- DOI not found or invalid prefix/suffix returns 404 or empty result
- Malformed DOI path parameters cause request failure
- Payment failure via x402 if USDC balance is insufficient
- Timeout if upstream DOI registry is slow or unavailable
- Some DOIs may resolve but have incomplete metadata

## How this service works

Global market, government and reference data for AI agents. Pay-per-call over x402 (USDC on Base mainnet).

## Output

Returns bibliographic metadata for the specified DOI, including paper title, authors, publication date, journal or conference name, abstract, and potentially citation count or related identifiers.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/worlddata402-doi-research-lookup-a8ca718f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from worlddata402.worlddata402.workers.dev](https://www.zero.xyz/host/worlddata402.worlddata402.workers.dev/llms.txt)