What are scholarly resource APIs ?
APIs, short for application programming interface, are tools used to share content and data between software applications. APIs are used in a variety of contexts, but some examples include embedding content from one website into another, dynamically posting content from one application to display in another application, or extracting data from database in a more programmatic way than a regular user interface would allow.
Many scholarly publishers, databases, and products offer APIs to allow users with programming skills to more powerfully extract data to use for a variety of purposes. Some APIs allow programmatic bibliographic searching of a citation database, others allow extraction of statistical data, others allow dynamic querying and posting of blog content.
Below is a list of commonly used scholarly resources at MIT that make their APIs available for use. If you have programming skills and would like to use APIs in your research, use the table below to get an overview of some available APIs.
If you have any questions or know of an API you would like to see include in this list, please contact Mark Clemente, Library Fellow for Scholarly Publishing and Licensing in the MIT Libraries (contact information as the bottom of this page).
List of APIs for Scholarly Resources
|API||What it does||
How is it accessed
|Result format||Registration||Limitations (record numbers, fields accessible)||Contact for technical questions|
|Web of Science Web Services||Bibliographic search service. Allows automatic, real-time querying of records. Primarly for populating an institutional repository.||Uses SOAP protocol to access||XML||Free to register if you are affiliated with a host institution that subscribes to Web of Science.||Extractable data is limited to particular fields, databses, and filedepths, also depends on host institution's email@example.com|
|Nature Blogs API||Blog tracking and indexing service; tracks Nature blogs and other third-party science blogs||RESTful interface, queries are made as HTTP GET requests||Default is JSON, some queries return Atom/RSS, CSV||Free to register, developer account and API key needed; see here.
||2 calls per second; 5,000 calls per day; RSS results are limited to 100 items firstname.lastname@example.org|
|Nature OpenSearch API||Bibliographic search service for Nature content||REST API with two interfaces: 1) OpenSearch standard interface using keyword searches; 2) SRU search interface using CQL structed queries||RSS, JSON, ATOM, SRU XML, TURTLE, depending on interface used||Free to register, developer account and API key needed; see here.||2 calls per second; 5,000 calls per email@example.com|
|arXiv API||Gives programmatic access to all of the arXiv data, search and linking facilities||API calls are made using any web-enabled client (e.g. a web browser) to make an HTTP GET or POST request to an appropriate url. API users can use the programming language of their choice.||Atom||Free to use, no registration or API key required.
||No stated limitations, but high-volume users should contact arXiv: http://arxiv.org/help/contact||arXiv Google Group
|IEEE Xplore XML Search API||Allows IEEE customers and 3rd parties such as federated search vendors to query the IEEE Xplore content repository and retrieve results for manipulation and presentation on local web interfaces||HTTP requests using structured URL queries||XML||Must be an IEEE customer (i.e. belong to an institution that subscribes to IEEE Xplore). Contact firstname.lastname@example.org to receive API user guide.||Maximum of 200 results may be retrieved in a single query. A query term can only contain a maximum of 10 email@example.com|
|Springer Metadata API||Provides metadata for over 5 million online documents (e.g. journal articles, book chapters, protocols).||RESTful interface, using structured URL requests||XML in PRISM Aggregator message format, JSON, JSONP||Free to register. API key needed.
||No stated limitations. High-volume users should contact Springer.
|Springer Images API||Provides images and related text for over 300,000 free images available on Springer Images.||RESTful interface, using structured URL requests||XML, JSON, JSONP||Free to register. API key needed.
||No stated limitations. High-volume users should contact Springer.||firstname.lastname@example.org|
|Springer Open Access API||Provides metadata, full-text content, and images for over 80,000 open access articles from BioMed Central and SpringerOpen journals.||RESTful interface, using structured URL requests||XML in Springer's A++ format, JSON||Free to register. API key needed.||No stated limitations. High-volume users should contact Springer.||email@example.com|
|PLoS Article-Level Metrics API||Retrieves article-level metrics (including usage statistics, citation counts, and social networking activity) for articles published in PLOS journals and articles added to PLOS Hubs: Biodiversity||RESTful interface, queries are made as HTTP GET requests||XML, JSON, CSV||Free to register. API key needed. Go to http://api.plos.org/registration/.||Max is 1000 requests a day. Users should wait 5 seconds for each query to return results. High-volume users should contact firstname.lastname@example.org. API users are limited to no more than five concurrent connections from a single IP email@example.com; Questions can also be posted in PLoS API Google Group|
|PLoS Search API||Allows PLoS content to be queried using the 23 terms in the PLoS search, for integration into web, desktop, or mobile applications||RESTful interface, queries are made as HTTP GET requests||XML||Free to register. API key needed. Go to http://api.plos.org/registration/.||Max is 7200 requests a day, 300 per hour, 10 per minute. Users should wait 5 seconds for each query to return results. Requests should not return more than 100 rows. High-volume users should contact firstname.lastname@example.org. API users are limited to no more than five concurrent connections from a single IP email@example.com; Questions can also be posted in PLoS API Google Group|
|BioMed Central API||Retrieves: 1) BMC Latest Articles; 2) BMC Editors picks; 3) Data on article subscription and access; 4) Bibliographic search data||RESTful interface, queries are made as HTTP GET requests||JSON||Free to access, no registration required.
||No limitations at firstname.lastname@example.org|
|PubMed E-Utilities API||Set of 8 server-side programs for searching 38 NCBI Entrez databases of biomedical literature and data||To access data, a piece of software posts an URL using a fixed sytax to NCBI's E-Utilities server, then retrieves and processes data. Users can use any programming langauge that can send the URL and interpret the XML response (e.g. Perl, Python, Java, C++, etc.)||XML||Free to register; registration is not necessary but strongly encouraged.
||3 URL requests per second; large jobs should be limited to weekends or business email@example.com|
|NLM APIs||NLM offers 21 different APIs for accessing various NLM databases.||Varies depending on API.||Varies depending on API.||Varies depending on API.||Varies depending on API.||Varies depending on API.
|World Bank Indicators||Provides access to nine World Bank statistical databases:||RESTful interface||XML, JSON||Free to use, no registration or API key required.
||Requests volume, while not specified, should be "reasonable"||firstname.lastname@example.org|
|World Bank Projects||Provides access to data on all closed, active, and planned World Bank projects||RESTful interface||XML, JSON, Atom||Free to use, no registration or API key required.
||Requests volume, while not specified, should be "reasonable"||email@example.com|
|World Bank Finances||Provides access to the data on the World Bank’s loans, credits, financial statements and other data related to the financial operations||RESTful interface||XML, JSON and RDF||Free to use, no registration or API key required.||Requests volume, while not specified, should be "reasonable"||firstname.lastname@example.org|
|ORCID API||Queries and searches the ORCID researcher identifier system and obtain researcher profile data||RESTful interface||HTML, XML, or JSON||Two options: 1) Users can access the Public API,which only returns data marked as "public"; 2) Become an Orcid member to receive API credentials: see here.||Data retrieved through Public API is limited||http://about.orcid.org/help/contact-us|
|UN ComTrade||Allows access to data on International Merchandise Trade Statistics (IMTS) and the work of the International Merchandise Trade Statistics Section (IMTSS) of the United Nations Statistics Division||Some services in REST, some in SOAP||XML, CSV, depending on service||Comtrade Web Services requires IP authentication, users must have site license account. However, access to metadata and data availability is not restricted.
||Depending on access rights, the following data can be obtained: Comtrade Data, Tariff Line Data, Total Trade, Annual Totals, Processed Data or Original Data. The latest three are restricted for data exchange between UN and OECD.||email@example.com|
|STAT!Ref OpenSearch API||Bibliographic search service for displaying syndicated results on a website.||Uses OpenSearch specifications.||RSS, ATOM, HTML
||Free to register for users at subscribing host institution.||Limits exist but are not specified; high-volume users should contact STAT!Ref.||firstname.lastname@example.org|
Publishers and products without APIs
The following publishers, databases, or products do not currently offer APIs (as of 2013):
ACM Digital Library
CAS - Scifinder
Knovel (a search API is currently in development)
OECD (an API for OECD Delta is currently in development)
SPIE Digital Library
Wiley Online Library (a search API is currently in development)