# pubmed-search

> PubMed / MEDLINE search with full records: PMID, title, authors, journal, year, volume/pages, DOI, PMCID, publication types, MeSH terms and abstract. Accepts PubMed query syntax or a list of PMIDs. No API key needed.

- URL: https://forge-tools.dentreprise.workers.dev/api/pubmed-search (GET or POST)
- Price: 0.003 USDC on Base (3000 atomic USDC)
- MCP tool: pubmed_search
- Docs: https://agent-hub.dentreprise.workers.dev/tools/pubmed-search/

## Parameters

- `q` (string): PubMed query
- `pmid` (string): Comma-separated PMIDs (alternative to q)
- `max` (string): 1-20, default 5
- `sort` (string): relevance or pub_date
- `abstracts` (string): true/false, default true

## Unpaid example

```bash
curl -sS -D - "https://forge-tools.dentreprise.workers.dev/api/pubmed-search?q=x402+OR+%22agent+payments%22&max=3"
```

## Example 402 challenge

```json
{
  "x402Version": 2,
  "error": "Payment required",
  "resource": {
    "url": "https://forge-tools.dentreprise.workers.dev/api/pubmed-search",
    "description": "PubMed / MEDLINE search with full records: PMID, title, authors, journal, year, volume/pages, DOI, PMCID, publication types, MeSH terms and abstract. Accepts PubMed query syntax or a list of PMIDs. No API key needed.",
    "mimeType": "application/json"
  },
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:8453",
      "amount": "3000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "payTo": "0x7B8bf45ac6AcbA6D4CFB626b57D3f5fF3C9C89F7",
      "maxTimeoutSeconds": 120,
      "extra": {
        "name": "USD Coin",
        "version": "2"
      }
    }
  ]
}
```

## Example response

```json
{
  "total": 1234,
  "count": 3,
  "articles": [
    {
      "pmid": "38000000",
      "title": "…",
      "doi": "10.…",
      "abstract": "…"
    }
  ]
}
```

## Free demo / sample

This tool accepts `?demo=1` on the wave-1 worker (labelled sample, HTTP 200, not live data). The first 3 successful real calls per IP per UTC day are also free.

```bash
curl -sS "https://forge-tools.dentreprise.workers.dev/api/pubmed-search?q=x402+OR+%22agent+payments%22&max=3&demo=1"
```

```json
{
  "demo": true,
  "demo_label": "DEMO / SAMPLE — not live data. This is a labelled example response and was not charged.",
  "charged": false,
  "tool": "/api/pubmed-search",
  "docs": "https://agent-hub.dentreprise.workers.dev/tools/pubmed-search/",
  "how_to_get_live_data": "Call the same URL without demo=1. The first 3 successful real calls per IP per UTC day are free; after that attach an x402 v2 PAYMENT-SIGNATURE (USDC on Base).",
  "sample": {
    "total": 1234,
    "count": 3,
    "articles": [
      {
        "pmid": "38000000",
        "title": "…",
        "doi": "10.…",
        "abstract": "…"
      }
    ]
  }
}
```

## Clients

- JS (x402 v2): `@x402/fetch` + `@x402/evm` (`wrapFetchWithPaymentFromConfig`, `ExactEvmScheme`). The older package `x402-fetch` is deprecated v1.
- Python: PyPI package `x402` (`x402HttpxClient` or `x402_requests`, `register_exact_evm_client`, `EthAccountSigner`).
- MCP: stdio `node src/server.mjs` in [forge-agent-mcp](https://github.com/forge-agent-hub/forge-agent-mcp); hosted Streamable HTTP at https://x402-gateway.forge-x402.workers.dev/mcp (original gateway tools).
- LangChain: wrap those clients with `DynamicStructuredTool` (`@langchain/core`) or `@tool` (`langchain_core`).
- Copy-paste snippets: https://agent-hub.dentreprise.workers.dev/tools/pubmed-search/ and https://agent-hub.dentreprise.workers.dev/quickstart/