Yes. The Free tier is 600 requests a month at 100 requests a minute, across every endpoint in the catalogue, with no credit card. Nothing about it expires.

What happens when I hit the quota?

Requests return 429 with the limit, what you have used, and which window you tripped — nothing is queued, and nothing is charged. The monthly quota resets on the 1st (UTC). There is no rollover: unused requests do not carry into the next month.

Do failed requests use up my quota?

A 5xx does not. If a source breaks on our side, the request is excluded from your monthly count. A 4xx does count — a wrong parameter is still a request we answered. Per-minute throttling counts everything, so a retry loop is still throttled.

Which tier do I need?

Start on Free. Every response carries the remaining quota in its headers, and the dashboard reads the same number enforcement uses, so you will see the ceiling coming rather than discovering it.

How is Zapi different from RapidAPI or Apify?

Zapi focuses on a consistent REST contract — one API key, one response format, one error pattern for every source. No need to learn per-provider quirks like on traditional marketplaces, and no need to set up scraping workflows like on Apify.

What about the legality of accessing public data?

Zapi only accesses data that is publicly available without a login. Responsibility for how it is ultimately used stays with the developer — make sure your use case complies with the original source's ToS and the regulations in your operating region.

Is there an official SDK?

One: zpi-sdk, for TypeScript and JavaScript. It carries a typed error hierarchy, retries only what is safe to retry, submits bulk jobs, and verifies webhook signatures. Everything else is plain REST — cURL or any HTTP client works.

Can I request a source that isn’t in the catalogue yet?

Yes, through the community Discord, on any tier.

Europe PMC

Europe PMC life-science literature — search, citations, references, full text, books, supplementary files, text-mined annotations and grants.

14 endpoints77 calls12/14 passing

Get API key

Annotations By Article

Text-mined entities for named articles. This replaces the retired textMinedTerms route; one unfiltered article can exceed 130 KB, so the body is read under a ceiling.

GET/v1/research:europepmc/annotations-by-article

passing · 0.7s5m cache

Parameters

Name	Type	In	Description
articleIds	string	query	One or more SOURCE:ID pairs separated by commas, such as MED:33301246,PMC:PMC7745181. Up to 8 per call. Required.
type	enum	query	Restrict to one entity type. Default all types. One of Gene_Proteins, Chemicals, Diseases, Organisms, Accession Numbers, Gene Ontology, Sequence Ontology, Experimental Methods, Cell, Cell Line, Body Part.
section	enum	query	Restrict to one article section. Default all sections. One of Title, Abstract, Introduction, Methods, Results, Discussion, Conclusion.
annotationProvider	string	query	Restrict to one annotation provider. Default all providers.

Example response

{"project":"research:europepmc",  "data": {"count":1,    "items": [      {"id":"33301246","count":8,"pmcid":"PMC7745181","source":"MED",        "annotations": [          {            "tags": [              {"uri":"http://linkedlifedata.com/resource/umls-concept/C3714514","name":"infestations and infections"              }            ],"type":"Diseases","exact":"infection","prefix":"coronavirus 2 (SARS-CoV-2)","postfix":"and the resulting","section":"Abstract (http://purl.org/dc/terms/abstract)","frequency":null,"annotationId":"http://europepmc.org/article/MED/33301246#europepmc-2faf2bd76e3bbc392264592dd9233545","annotationProvider":"Europe PMC"          },          {            "tags": [              {"uri":"http://linkedlifedata.com/resource/umls-concept/C5203670","name":"caused by sarscov2"              }            ],"type":"Diseases","exact":"coronavirus disease 2019","prefix":"and the resulting","postfix":"disease 2019 (Covid-19)","section":"Abstract (http://purl.org/dc/terms/abstract)","frequency":null,"annotationId":"http://europepmc.org/article/MED/33301246#europepmc-7e5d5f7cd73d9b67569981d4a0b22dcb","annotationProvider":"Europe PMC"          }        ],        "fullTextIds": [          "PMC7745181"        ]      }    ],"provider":"europepmc",    "articleIds": [      "MED:33301246"    ]  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Annotations By Provider

Bulk annotation stream for one provider. Measured at ~820 KB per article, so the page size is capped hard and the body is read against a ceiling and the deadline.

GET/v1/research:europepmc/annotations-by-provider

slow · 29.7s5m cache

Parameters

Name	Type	In	Description
annotationProvider	string	query	Annotation provider to stream, such as Europe PMC, IntAct or OpenTargets. Required.
cursor	string	query	Cursor for the next slice. Start at 0 then pass nextCursor.
limit	number	query	Articles per call. Default 1, max 3 — one article averages 820 KB.

Example response

{"project":"research:europepmc",  "data": {"count":1,    "items": [      {"id":"PMC11231130","count":4539,"pmcid":"PMC11231130","source":"PMC",        "annotations": [          {            "tags": [              {"uri":"http://linkedlifedata.com/resource/umls-concept/C0007222","name":"Cardiovascular Disease"              }            ],"type":"Diseases","exact":"Cardiovascular Disease","prefix":null,"postfix":null,"section":null,"frequency":43,"annotationId":null,"annotationProvider":"Europe PMC"          },          {            "tags": [              {"uri":"http://linkedlifedata.com/resource/umls-concept/C1609538","name":"Latent Tuberculosis Infection"              }            ],"type":"Diseases","exact":"Latent Tuberculosis Infection","prefix":null,"postfix":null,"section":null,"frequency":4,"annotationId":null,"annotationProvider":"Europe PMC"          }        ],        "fullTextIds": [          "PMC11231130"        ]      }    ],"limit":1,"hasMore":true,"provider":"europepmc","nextCursor":"28754.31123113","annotationProvider":"Europe PMC"  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Article

One Europe PMC record, resolved through the EXT_ID+SRC fast path of /search at resultType=core — the only shape that carries all 48 fields and the has* routing flags.

GET/v1/research:europepmc/article

passing · 0.2s5m cache

Parameters

Name	Type	In	Description
id	string	query	Article identifier within the source — a PMID for MED, a PMCID for PMC. Required.
source	enum	query	Source archive the id belongs to. Default MED. One of MED, PMC, PPR, AGR, CBA, CTX, ETH, HIR, PAT, NBK.

Example response

{"project":"research:europepmc",  "data": {"id":"33301246","doi":"10.1056/nejmoa2034577","pmid":"33301246","inPMC":true,"pmcid":"PMC7745181","title":"Safety and Efficacy of the BNT162b2 mRNA Covid-19 Vaccine.",    "grants": [      {"agency":"BioNTech and Pfizer","acronym":null,"grantId":null,"orderIn":0      }    ],"hasPDF":true,"inEPMC":true,"source":"MED","authMan":false,    "authors": [      {"orcid":null,"fullName":"Polack FP","initials":"FP","lastName":"Polack","firstName":"Fernando P",        "affiliations": [          "From Fundacion INFANT (F.P.P.) and iTrials-Hospital Militar Central (G.P.M.), Buenos Aires; State University of New York, Upstate Medical University, Syracuse (S.J.T.), and Vaccine…"        ],"collectiveName":null      }    ],"hasBook":false,"hasData":true,"license":null,"pubYear":2020,    "subsets": [      {"code":"IM","name":"Index Medicus"      }    ],"abstract":"<h4>Background</h4>Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection and the resulting coronavirus disease 2019 (Covid-19) have afflicted tens of millions of p…","hasSuppl":true,"language":"eng","pageInfo":"2603-2615","provider":"europepmc","pubModel":"Print-Electronic",    "pubTypes": [      "Clinical Trial, Phase III"    ],    "authorIds": [      {"type":"ORCID","value":"0000-0001-6269-2354"      }    ],    "chemicals": [      {"name":"Vaccines, Synthetic","registryNumber":"0"      }    ],"nihAuthMan":false,"affiliation":"From Fundacion INFANT (F.P.P.) and iTrials-Hospital Militar Central (G.P.M.), Buenos Aires; State University of New York, Upstate Medical University, Syracuse (S.J.T.), and Vaccine…","epmcAuthMan":false,    "fullTextIds": [      "PMC7745181"    ],    "journalInfo": {"issue":"27","volume":"383",      "journal": {"essn":"1533-4406","issn":"0028-4793","nlmId":"0255562","title":"The New England journal of medicine","isoAbbreviation":"N Engl J Med","medlineAbbreviation":"N Engl J Med"      },"journalIssueId":3059948,"dateOfPublication":"2020 Dec","yearOfPublication":2020,"monthOfPublication":12,"printPublicationDate":"2020-12-01"    },"authorString":"Polack FP, Thomas SJ, Kitchin N, Absalon J, Gurtman A, Lockhart S, Perez JL, Pérez Marc G, Moreira ED, Zerbini C, Bailey R, Swanson KA, Roychoudhury S, Koury K, Li P, Kalina WV, Co…","citedByCount":12438,    "fullTextUrls": [      {"url":"https://www.arca.fiocruz.br/handle/icict/46039","site":"Unpaywall","availability":"Open access","documentStyle":"html","availabilityCode":"OA"      }    ],"hasLabsLinks":true,"isOpenAccess":true,    "meshHeadings": [      {"majorTopic":false,"descriptorName":"Humans"      }    ],    "dataLinksTags": [      "altmetrics"    ],"hasReferences":true,    "investigators": [      {"orcid":null,"fullName":"Aberg J","initials":"J","lastName":"Aberg","firstName":"Judith","collectiveName":null      }    ],"dateOfCreation":"2020-12-10","dateOfRevision":"2026-01-27","firstIndexDate":"2020-12-11","hasEvaluations":false,"dateOfCompletion":"2021-01-12",    "tmAccessionTypes": [      "nct"    ],"hasTextMinedTerms":true,"publicationStatus":"ppublish",    "commentCorrections": [      {"id":"33301245","type":"Comment in","source":"MED","orderIn":1,"reference":"N Engl J Med. 2020 Dec 31;383(27):2677-2678. doi: 10.1056/NEJMe2034717."      }    ],"firstPublicationDate":"2020-12-10","fullTextReceivedDate":"2025-02-03","hasDbCrossReferences":false,"hasTMAccessionNumbers":true,"electronicPublicationDate":"2020-12-10"  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Book

Book XML from the NCBI Bookshelf mirror. NBK1116 alone is 4.1 MB, so the byte ceiling and the deadline are load-bearing, not decoration.

GET/v1/research:europepmc/book

failed last check5m cache

Parameters

Name	Type	In	Description
nbkId	string	query	NCBI Bookshelf identifier of the book or chapter. Required.

Example response

{"project":"research:europepmc",  "data": {"id":"NBK1116","bytes":4108845,"format":"xml","source":"NBK","content":"<!DOCTYPE book-part-wrapper PUBLIC \"-//NLM//DTD BITS Book Interchange DTD v2.0 20151225//EN\" \"BITS-book2.dtd\"><book-part-wrapper xmlns:ali=\"http://www.niso.org/schemas/ali/1.0/\" xm…","complete":true,"provider":"europepmc"  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Citations

Articles citing one Europe PMC record. Upstream pages by offset, not cursor.

GET/v1/research:europepmc/citations

slow · 0.8s5m cache

Parameters

Name	Type	In	Description
id	string	query	Article identifier within the source — a PMID for MED, a PMCID for PMC. Required.
source	enum	query	Source archive the id belongs to. Default MED. One of MED, PMC, PPR, AGR, CBA, CTX, ETH, HIR, PAT, NBK.
page	number	query	Page number. Default 1.
limit	number	query	Items per page. Default 25, max 100.

Example response

{"project":"research:europepmc",  "data": {"id":"33301246","page":1,"count":3,    "items": [      {"id":"PPR1298176","doi":null,"essn":null,"issn":null,"issue":null,"title":"A full-flow microfluidic platform for synthesis, purification and concentrating of lipid nanoparticles (LNPs)","source":"PPR","volume":null,"pubYear":2026,"pageInfo":null,"authorString":"Tao J, Zhao J, Liu Y, Hu L, Zhou H, Wang B, Kang Y.","citationType":"preprint","citedByCount":0,"externalLink":null,"journalAbbreviation":null      },      {"id":"42595948","doi":null,"essn":null,"issn":null,"issue":null,"title":"Exploring the Polyethylene Glycol-Modified Drug Patent Landscape by Deep Learning.","source":"MED","volume":null,"pubYear":2026,"pageInfo":null,"authorString":"Zhang T, Deng D, Zhang X, Chen W, Wang P, Li X, Cong J, Wei B, Liu K.","citationType":"journal article","citedByCount":0,"externalLink":null,"journalAbbreviation":"Ther Innov Regul Sci"      }    ],"limit":3,"total":12080,"source":"MED","hasMore":true,"nextPage":2,"provider":"europepmc"  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Database Links

Cross-references from one Europe PMC record into the molecular databases (UniProt, PDB, ENA, ChEBI …). Upstream names the filter `database`.

GET/v1/research:europepmc/database-links

passing · 0.2s5m cache

Parameters

Name	Type	In	Description
id	string	query	Article identifier within the source — a PMID for MED, a PMCID for PMC. Required.
source	enum	query	Source archive the id belongs to. Default MED. One of MED, PMC, PPR, AGR, CBA, CTX, ETH, HIR, PAT, NBK.
database	string	query	Restrict to one database, such as EMBL, UNIPROT, PDB, CHEBI, OMIM, PRIDE.
page	number	query	Page number. Default 1.
limit	number	query	Items per page. Default 25, max 100.

Example response

{"project":"research:europepmc",  "data": {"id":"18407985","page":1,"count":0,"items":[],"limit":3,"total":null,"source":"MED","hasMore":false,"database":"EMBL","nextPage":null,"provider":"europepmc"  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Full Text

JATS full-text XML for one open-access PMC record. Non-JSON upstream, so this is a flat single object; the body is read against a byte ceiling and the 60s wall.

GET/v1/research:europepmc/full-text

passing · 0.8s5m cache

Parameters

Name	Type	In	Description
pmcid	string	query	PMC identifier of an article whose full text is in Europe PMC. Required.

Example response

{"project":"research:europepmc",  "data": {"id":"PMC3258128","bytes":94004,"format":"xml","source":"PMC","content":"<?xml version=\"1.0\" encoding=\"UTF-8\"?><article xml:lang=\"en\" article-type=\"research-article\"><front><journal-meta><journal-id journal-id-type=\"pmc-domain-id\">4</journal-id><journal…","complete":true,"provider":"europepmc"  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Grants

GRIST grant records. The upstream folds its whole query string into one path segment and mangles any parameter it does not know, so order and set are fixed.

GET/v1/research:europepmc/grants

failed last check5m cache

Parameters

Name	Type	In	Description
query	string	query	Free text, or a GRIST field expression such as gr.gid eq "23942" or pi.fn eq "Smith". Required.
resultType	enum	query	Field depth per record. Default core, which carries the abstract and amount. One of lite, core.
page	number	query	Page number. Default 1. Upstream fixes the page at 25 records.

Example response

{"project":"research:europepmc",  "data": {"page":1,"count":25,    "items": [      {        "grant": {"doi":"10.3030/101231026","type":"Consolidator Grant","alias":"101231026","title":"Evolution of Mechanisms for Sex Chromosome Dosage Compensation and Gene Regulation (EMERGE)","amount":1999177,          "funder": {"name":"European Research Council","fundRefId":"https://doi.org/10.13039/501100000781","searchTerm":"European Research Council"          },"stream":"Frontier Research","endDate":"2031-07-31","grantId":"101231026","abstract":"There is a remarkable diversity of phenotypes among multicellular animals, including differences between males and females. A major driver of phenotypic variation stems from differ…","category":"Horizon Europe","currency":"EUR","startDate":"2026-08-01","abstractType":"scientific","abstractLanguage":"en"        },        "person": {"orcid":"0000-0003-4135-5927","title":"Dr","initials":"C","givenName":"Claudia","familyName":"Keller Valsecchi"        },        "institution": {"name":"University of Basel","rorId":"02s6k3f65","department":null,"officialName":"University of Basel"        }      }    ],"limit":25,"query":"malaria","total":1683,"hasMore":true,"nextPage":2,"provider":"europepmc","resultType":"core"  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Labs Links

External provider links (Altmetric, Publons, BioStudies, Faculty Opinions …) for one Europe PMC record. Upstream returns the whole provider set in one call.

GET/v1/research:europepmc/labs-links

passing · 0.7s5m cache

Parameters

Name	Type	In	Description
id	string	query	Article identifier within the source — a PMID for MED, a PMCID for PMC. Required.
source	enum	query	Source archive the id belongs to. Default MED. One of MED, PMC, PPR, AGR, CBA, CTX, ETH, HIR, PAT, NBK.

Example response

{"project":"research:europepmc",  "data": {"id":"33301246","count":4,    "items": [      {"name":"Publons",        "links": [          {"url":"https://publons.com/p/35654943/","title":"Read 1 peer review on Publons","imageUrl":null          },          {"url":"https://publons.com/review/create/post/35654943/","title":"Add a post publication review on Publons","imageUrl":null          }        ],"frontTab":false,"linksCount":2,"providerId":1529,"description":"Our mission is to speed up science by working with peer reviewers, publishers, and research institutions to make peer review a rewarding activity."      },      {"name":"BioStudies: supplemental material and supporting data",        "links": [          {"url":"http://www.ebi.ac.uk/biostudies/studies/S-EPMC7745181?xr=true","title":"Safety and Efficacy of the BNT162b2 mRNA Covid-19 Vaccine.","imageUrl":null          }        ],"frontTab":false,"linksCount":1,"providerId":1518,"description":"Database of biological studies"      }    ],"source":"MED","provider":"europepmc"  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Profile

Hit counts for one query, faceted by source, publication type and subset — the cheapest way to size a search before paging it.

GET/v1/research:europepmc/profile

slow · 2.9s5m cache

Parameters

Name	Type	In	Description
query	string	query	Search terms, same grammar as the search endpoint. Required.
synonym	enum	query	Expand the query with MeSH and UniProt synonyms. Default false. One of true, false.

Example response

{"project":"research:europepmc",  "data": {"count":15,    "items": [      {"name":"AGR","count":489,"group":"source"      },      {"name":"CBA","count":117,"group":"source"      },      {"name":"CTX","count":9,"group":"source"      },      {"name":"ETH","count":1024,"group":"source"      },      {"name":"HIR","count":4,"group":"source"      },      {"name":"MED","count":254752,"group":"source"      },      {"name":"PAT","count":2254,"group":"source"      },      {"name":"CIT","count":0,"group":"source"      }    ],"query":"malaria","provider":"europepmc"  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

References

The reference list of one Europe PMC record. Upstream pages by offset, not cursor.

GET/v1/research:europepmc/references

slow · 2.1s5m cache

Parameters

Name	Type	In	Description
id	string	query	Article identifier within the source — a PMID for MED, a PMCID for PMC. Required.
source	enum	query	Source archive the id belongs to. Default MED. One of MED, PMC, PPR, AGR, CBA, CTX, ETH, HIR, PAT, NBK.
page	number	query	Page number. Default 1.
limit	number	query	Items per page. Default 25, max 100.

Example response

{"project":"research:europepmc",  "data": {"id":"33301246","page":1,"count":3,    "items": [      {"id":"18797453","doi":null,"essn":"1525-0024","issn":"1525-0016","issue":"11","title":"Incorporation of pseudouridine into mRNA yields superior nonimmunogenic vector with increased translational capacity and biological stability.","source":"MED","volume":"16","matched":true,"pubYear":2008,"pageInfo":"1833-1840","citedOrder":1,"authorString":"Kariko K, Muramatsu H, Welsh FA, Ludwig J, Kato H, Akira S, Weissman D.","citationType":"JOURNAL ARTICLE","externalLink":null,"journalAbbreviation":"Mol Ther","unstructuredInformation":null      },      {"id":"31828291","doi":null,"essn":"1537-6591","issn":"1058-4838","issue":"7","title":"Comparative Immunogenicity of Several Enhanced Influenza Vaccine Options for Older Adults: A Randomized, Controlled Trial.","source":"MED","volume":"71","matched":true,"pubYear":2020,"pageInfo":"1704-1714","citedOrder":2,"authorString":"Cowling BJ, Perera RAPM, Valkenburg SA, Leung NHL, Iuliano AD, Tam YH, Wong JHF, Fang VJ, Li APY, So HC, Ip DKM, Azziz-Baumgartner E, Fry AM, Levine MZ, Gangappa S, Sambhara S, Bar…","citationType":"JOURNAL ARTICLE","externalLink":null,"journalAbbreviation":"Clin Infect Dis","unstructuredInformation":null      }    ],"limit":3,"total":7,"source":"MED","hasMore":true,"nextPage":2,"provider":"europepmc"  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Search Post

Europe PMC searchPOST — the same index as `search`, reached with a form body so a query too long for a URL still fits. Same cursor-walk pagination, same envelope.

POST/v1/research:europepmc/search-post

passing · 0.3s5m cache

Parameters

Name	Type	In	Description
query	string	body	Search terms. Supports the field grammar SRC:, EXT_ID:, DOI:, PUB_YEAR:, AUTHORID:, JOURNAL:, AFF:, GRANT_AGENCY:, HAS_FT:, OPEN_ACCESS:, LICENSE:. Required.
resultType	enum	body	Field depth per record. Default lite, core carries all 48 fields. One of idlist, lite, core.
page	number	body	Page number. Default 1, max 10 — pass cursor for anything deeper.
cursor	string	body	Cursor for unbounded deep paging. Start with * then pass nextCursor. Overrides page.
limit	number	body	Items per page. Default 25, max 100.
sort	enum	body	Sort order. Default relevance. One of relevance, dateAsc, dateDesc, citedAsc, citedDesc, author, title.
synonym	enum	body	Expand the query with MeSH and UniProt synonyms. Default false. One of true, false.

Example response

{"project":"research:europepmc",  "data": {"page":null,"count":3,    "items": [      {"id":"33069326","doi":"10.1016/s0140-6736(20)30925-9","pmid":"33069326","inPMC":true,"pmcid":"PMC7567026","title":"Global burden of 369 diseases and injuries in 204 countries and territories, 1990-2019: a systematic analysis for the Global Burden of Disease Study 2019.","hasPDF":false,"inEPMC":true,"source":"MED","authMan":null,"hasBook":false,"hasData":null,"license":null,"pubYear":2020,"abstract":null,"hasSuppl":true,"language":null,"pageInfo":"1204-1222","pubModel":null,        "pubTypes": [          "research-article; journal article"        ],"nihAuthMan":null,"affiliation":null,"epmcAuthMan":null,        "fullTextIds": [          "PMC7567026"        ],        "journalInfo": {"issue":"10258","volume":"396",          "journal": {"essn":null,"issn":"0140-6736; 1474-547x; ","nlmId":null,"title":"Lancet","isoAbbreviation":null,"medlineAbbreviation":null          },"journalIssueId":null,"dateOfPublication":null,"yearOfPublication":null,"monthOfPublication":null,"printPublicationDate":null        },"authorString":"GBD 2019 Diseases and Injuries Collaborators.","citedByCount":14449,"hasLabsLinks":true,"isOpenAccess":true,"hasReferences":true,"dateOfCreation":null,"dateOfRevision":null,"firstIndexDate":"2020-10-20","hasEvaluations":null,"dateOfCompletion":null,        "tmAccessionTypes": [          "doi"        ],"hasTextMinedTerms":true,"publicationStatus":null,"firstPublicationDate":"2020-10-01","fullTextReceivedDate":null,"hasDbCrossReferences":false,"hasTMAccessionNumbers":true,"electronicPublicationDate":null      }    ],"limit":3,"query":"SRC:MED AND PUB_YEAR:2020 AND malaria","total":13355,"hasMore":true,"nextPage":null,"provider":"europepmc","nextCursor":"AoJQ8AMoNDIwMTUxNDc=","resultType":"lite"  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Search

Europe PMC REST search — open JSON, no key, rung 1 (direct) per recon. Measured 2026-08-29: upstream ignores `page` and paginates by cursorMark alone, so a

GET/v1/research:europepmc/search

passing · 0.2s5m cache

Parameters

Name	Type	In	Description
query	string	query	Search terms. Supports the field grammar SRC:, EXT_ID:, DOI:, PUB_YEAR:, AUTHORID:, JOURNAL:, AFF:, GRANT_AGENCY:, HAS_FT:, OPEN_ACCESS:, LICENSE:. Required.
resultType	enum	query	Field depth per record. Default lite, core carries all 48 fields. One of idlist, lite, core.
page	number	query	Page number. Default 1, max 10 — pass cursor for anything deeper.
cursor	string	query	Cursor for unbounded deep paging. Start with * then pass nextCursor. Overrides page.
limit	number	query	Items per page. Default 25, max 100.
sort	enum	query	Sort order. Default relevance. One of relevance, dateAsc, dateDesc, citedAsc, citedDesc, author, title.
synonym	enum	query	Expand the query with MeSH and UniProt synonyms. Default false. One of true, false.

Example response

{"project":"research:europepmc",  "data": {"page":null,"count":3,    "items": [      {"id":"33069326","doi":"10.1016/s0140-6736(20)30925-9","pmid":"33069326","inPMC":true,"pmcid":"PMC7567026","title":"Global burden of 369 diseases and injuries in 204 countries and territories, 1990-2019: a systematic analysis for the Global Burden of Disease Study 2019.","hasPDF":false,"inEPMC":true,"source":"MED","authMan":null,"hasBook":false,"hasData":null,"license":null,"pubYear":2020,"abstract":null,"hasSuppl":true,"language":null,"pageInfo":"1204-1222","pubModel":null,        "pubTypes": [          "research-article; journal article"        ],"nihAuthMan":null,"affiliation":null,"epmcAuthMan":null,        "fullTextIds": [          "PMC7567026"        ],        "journalInfo": {"issue":"10258","volume":"396",          "journal": {"essn":null,"issn":"0140-6736; 1474-547x; ","nlmId":null,"title":"Lancet","isoAbbreviation":null,"medlineAbbreviation":null          },"journalIssueId":null,"dateOfPublication":null,"yearOfPublication":null,"monthOfPublication":null,"printPublicationDate":null        },"authorString":"GBD 2019 Diseases and Injuries Collaborators.","citedByCount":14449,"hasLabsLinks":true,"isOpenAccess":true,"hasReferences":true,"dateOfCreation":null,"dateOfRevision":null,"firstIndexDate":"2020-10-20","hasEvaluations":null,"dateOfCompletion":null,        "tmAccessionTypes": [          "doi"        ],"hasTextMinedTerms":true,"publicationStatus":null,"firstPublicationDate":"2020-10-01","fullTextReceivedDate":null,"hasDbCrossReferences":false,"hasTMAccessionNumbers":true,"electronicPublicationDate":null      }    ],"limit":3,"query":"SRC:MED AND PUB_YEAR:2020 AND malaria","total":13355,"hasMore":true,"nextPage":null,"provider":"europepmc","nextCursor":"AoJQ8AMoNDIwMTUxNDc=","resultType":"lite"  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Supplementary Files

The supplementary-material archive for one PMC record. Upstream serves application/zip, so the handler resolves and sizes it and hands back the URL.

GET/v1/research:europepmc/supplementary-files

passing · 0.9s5m cache

Parameters

Name	Type	In	Description
pmcid	string	query	PMC identifier of an article with supplementary material. Required.

Example response

{"project":"research:europepmc",  "data": {"id":"PMC7654321","url":"https://www.ebi.ac.uk/europepmc/webservices/rest/PMC7654321/supplementaryFiles","bytes":100956,"format":"zip","source":"PMC","complete":true,"filename":"PMC7654321_SupplementaryFiles.zip","provider":"europepmc"  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Try it

Live request with your key

const data = await client.run(  "research:europepmc",  "annotations-by-article",  { articleIds: "MED:33301246", type: "Diseases", section: "Abstract", annotationProvider: "Europe PMC" });

Europe PMC

Europe PMC life-science literature — search, citations, references, full text, books, supplementary files, text-mined annotations and grants.

14 endpoints77 calls12/14 passing

Get API key

Text-mined entities for named articles. This replaces the retired textMinedTerms route; one unfiltered article can exceed 130 KB, so the body is read under a ceiling.

GET/v1/…europepmc/annotations-by-article

passing · 0.7s5m cache

Try it

Parameters

articleIds

string · query · required

One or more SOURCE:ID pairs separated by commas, such as MED:33301246,PMC:PMC7745181. Up to 8 per call.

type

enum · query · optional

Restrict to one entity type. Default all types.

section

enum · query · optional

Restrict to one article section. Default all sections.

annotationProvider

string · query · optional

Restrict to one annotation provider. Default all providers.

Example response

{"project":"research:europepmc",  "data": {"count":1,    "items": [      {"id":"33301246","count":8,"pmcid":"PMC7745181","source":"MED",        "annotations": [          {            "tags": [              {"uri":"http://linkedlifedata.com/resource/umls-concept/C3714514","name":"infestations and infections"              }            ],"type":"Diseases","exact":"infection","prefix":"coronavirus 2 (SARS-CoV-2)","postfix":"and the resulting","section":"Abstract (http://purl.org/dc/terms/abstract)","frequency":null,"annotationId":"http://europepmc.org/article/MED/33301246#europepmc-2faf2bd76e3bbc392264592dd9233545","annotationProvider":"Europe PMC"          },          {            "tags": [              {"uri":"http://linkedlifedata.com/resource/umls-concept/C5203670","name":"caused by sarscov2"              }            ],"type":"Diseases","exact":"coronavirus disease 2019","prefix":"and the resulting","postfix":"disease 2019 (Covid-19)","section":"Abstract (http://purl.org/dc/terms/abstract)","frequency":null,"annotationId":"http://europepmc.org/article/MED/33301246#europepmc-7e5d5f7cd73d9b67569981d4a0b22dcb","annotationProvider":"Europe PMC"          }        ],        "fullTextIds": [          "PMC7745181"        ]      }    ],"provider":"europepmc",    "articleIds": [      "MED:33301246"    ]  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Code

const data = await client.run(  "research:europepmc",  "annotations-by-article",  { articleIds: "MED:33301246", type: "Diseases", section: "Abstract", annotationProvider: "Europe PMC" });