# fittings PubMed/MEDLINE Citation Search

> fittings PubMed/MEDLINE Citation Search is a paid API for AI agents from fittings.sh, paid per call via x402, $0.0078/call, status unknown (last checked 2026-09-14).

Search PubMed/MEDLINE by keyword, author, or MeSH term and return matching citations with journal, authors, date, and DOI.

## Facts

- Endpoint: GET https://fittings.sh/v1/pubmed/search
- Price: $0.0078/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fittings-pubmed-medline-citation-search-bd5f9339
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0SW-ettxyt07ZOEUhcRZ0

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 fittings-pubmed-medline-citation-search-bd5f9339
```

Example prompt: Search PubMed for up to 10 recent articles about CRISPR gene editing in cancer treatment, sorted by date, and give me the titles, authors, journals, and DOIs.

## When to prefer this

Use this endpoint when you need structured citation metadata (journal, authors, date, DOI) from PubMed/MEDLINE via a paid, low-latency API with a predictable schema, rather than scraping PubMed directly or using the free NCBI Entrez API with its rate limits. Ideal for agents doing automated literature reviews, evidence gathering, or citation enrichment workflows.

## Known failure modes

- Empty result set if query matches no indexed articles
- Query too broad returns irrelevant or noisy results
- Invalid MeSH term may return zero or unrelated citations
- Limit out of range (above 20 or below 1) may cause a validation error
- PubMed/MEDLINE upstream API downtime causing service unavailability

## How this service works

Search PubMed/MEDLINE by keyword, author or MeSH term and return matching citations with journal, authors, date and DOI.

## Output

Returns a list of up to 20 PubMed citations, each including article title, author list, journal name, publication date, and DOI, matching the submitted keyword, author, or MeSH term query.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "query"
     ],
     "properties": {
      "sort": {
       "type": "string",
       "description": "'relevance' (default) or 'date'"
      },
      "limit": {
       "type": "number",
       "description": "1-20 citations, default 5"
      },
      "query": {
       "type": "string",
       "description": "PubMed query: keywords, author, or MeSH term"
      }
     }
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fittings-pubmed-medline-citation-search-bd5f9339/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from fittings.sh](https://www.zero.xyz/host/fittings.sh/llms.txt)