# PubMed Trends Compare

> PubMed Trends Compare is a paid API for AI agents from pubmed-trends-x402.ben-miles2.workers.dev, paid per call via x402, $0.02/call, status down (last checked 2026-09-15).

Compares publication trends across multiple biomedical research topics using PubMed data

## Facts

- Endpoint: POST https://pubmed-trends-x402.ben-miles2.workers.dev/api/v1/compare
- Price: $0.02/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pubmed-trends-compare-26705bbf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_omXe4FBov9P-5xWJGIeJa

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 pubmed-trends-compare-26705bbf -d '<json body>'
```

Example prompt: Compare the PubMed publication trends for 'mRNA vaccines' versus 'traditional vaccines' — I want to see how research output for each has changed and which one has more recent momentum.

## When to prefer this

Use this endpoint when you need to compare research publication trends across two or more biomedical or scientific topics using PubMed data. Ideal for literature reviews, identifying emerging research areas, or benchmarking scientific interest between competing topics.

## Known failure modes

- Invalid or unrecognized search terms returning empty results
- PubMed API rate limiting causing timeouts
- Too many topics submitted in a single request
- Network error reaching the Cloudflare Worker
- Payment failure due to insufficient USDC balance via x402 protocol

## Output

Returns comparative trend data showing publication counts and research activity metrics for the supplied biomedical topics, drawn from PubMed's literature database, allowing comparison of research volume and trajectory between topics.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pubmed-trends-compare-26705bbf/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from pubmed-trends-x402.ben-miles2.workers.dev](https://www.zero.xyz/host/pubmed-trends-x402.ben-miles2.workers.dev/llms.txt)