# SYNTHORA PubMed Citation Summary by PMID

> SYNTHORA PubMed Citation Summary by PMID is a paid API for AI agents from pubmed-esummary.hergertsynthora.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Fetches structured citation metadata (title, authors, journal, publication date, DOI, article IDs) for one or more PubMed IDs via NCBI eSummary

## Facts

- Endpoint: POST https://pubmed-esummary.hergertsynthora.com/service
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synthora-pubmed-citation-summary-by-pmid-c61799db
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iZXmB3r7GYfXJViTx7zA-

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 synthora-pubmed-citation-summary-by-pmid-c61799db -d '<json body>'
```

Example prompt: Can you look up the full citation details for PubMed ID 37901234 — I need the title, authors, journal, publication date, and DOI?

## When to prefer this

Choose this endpoint when you need to resolve one or more PubMed IDs into full structured citation metadata (title, authors, journal, date, DOI) without requiring an NCBI API key. It is ideal for biomedical agent workflows, literature enrichment pipelines, or any agent-to-agent workflow where PMIDs must be converted into human-readable or machine-structured bibliographic references at low cost.

## Known failure modes

- Invalid or non-existent PMID returns empty or error result
- NCBI eSummary API downtime causes service unavailability
- Malformed input ID (non-numeric or wrong format) may return no results
- Rate limiting or upstream NCBI throttling could delay responses
- Very recent articles may lack complete metadata (e.g. missing DOI)

## How this service works

Fetches structured document summaries for one or more PMIDs via NCBI esummary: title, authors, journal source, publication date, DOI and article IDs as JSON. Enables autonomous biomedical agents and agent-to-agent enrichment workflows to resolve PubMed IDs into full citation metadata keylessly. First 3 calls FREE per wallet — send header X-WALLET: 0x<addr>. No charge on upstream failure.

## Output

A JSON object containing structured citation metadata for the requested PMID, including article title, author list, journal source, publication date, DOI, and various article identifiers as returned by NCBI eSummary.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "id": {
   "type": "string",
   "description": "id"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "niche": "pubmed-esummary",
  "result": {}
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synthora-pubmed-citation-summary-by-pmid-c61799db/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from pubmed-esummary.hergertsynthora.com](https://www.zero.xyz/host/pubmed-esummary.hergertsynthora.com/llms.txt)