PubMed
NCBI E-utilities (metadata only). NLM does not claim copyright on abstracts but publishers may; this returns citation metadata.
- cost
- Free tier 4 with 3 free calls a day
- after that
- from $0.002 / call · card or USDC
- endpoints
- 4
No signup needed over MCP: 50 free calls a day, or 500 with a free key.
Search PubMed 3 free / day
PubMed ids matching a query (supports PubMed query syntax).
- cost
- 3 free / day then $0.002 / call
- MCP tool
- pubmed__search
- method
- GET
3 free calls a day, then $0.002 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/pubmed/search
| Param | Type | Description |
|---|---|---|
| term | string | Query |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/pubmed/search?term=GLP-1%20obesity%20randomized" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/pubmed/search?term=GLP-1%20obesity%20randomized"
by fourzerotwo
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Article summaries 3 free / day
Title, authors, journal, date and DOI for comma-separated PubMed ids.
- cost
- 3 free / day then $0.002 / call
- MCP tool
- pubmed__summary
- method
- GET
3 free calls a day, then $0.002 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/pubmed/summary
| Param | Type | Description |
|---|---|---|
| id | string | PMIDs, comma separated |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/pubmed/summary?id=38000000%2C37000000" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/pubmed/summary?id=38000000%2C37000000"
by fourzerotwo
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Search PubMed Central 3 free / day
Free full-text article ids in PubMed Central.
- cost
- 3 free / day then $0.002 / call
- MCP tool
- pubmed__pmc-search
- method
- GET
3 free calls a day, then $0.002 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/pubmed/pmc-search
| Param | Type | Description |
|---|---|---|
| term | string | Query |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/pubmed/pmc-search?term=CRISPR%20therapy" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/pubmed/pmc-search?term=CRISPR%20therapy"
by fourzerotwo
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Search clinical trial records 3 free / day
PubMed citations that are clinical trial reports for a query.
- cost
- 3 free / day then $0.002 / call
- MCP tool
- pubmed__clinical-trials-search
- method
- GET
3 free calls a day, then $0.002 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/pubmed/clinical-trials-search
| Param | Type | Description |
|---|---|---|
| term | string | Query with [pt] filter |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/pubmed/clinical-trials-search?term=semaglutide%20AND%20clinical%20trial%5Bpt%5D" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/pubmed/clinical-trials-search?term=semaglutide%20AND%20clinical%20trial%5Bpt%5D"
by fourzerotwo
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Source: National Library of Medicine / NCBI PubMed. NLM does not endorse this service.