G-P18 · TOPIC · interoperability-and-apisGCRI dossier · service level R0
GCRIDigital Public InfrastructureIn development
Topic dossier · Digital Public Infrastructure

Interoperability and apis

Interoperability lets systems run by different agencies, banks and firms exchange data and work together through common standards and application programming interfaces. It avoids lock-in, enables reuse and lets services be combined, and it requires governance, security and agreed meaning. This page sets out how interoperability is achieved, how it is measured, and what evidence serves the governments and standards bodies responsible.

Systems · around this subjectDesign, not a record

DPI service health

Interoperability and apis · Payment switch · Today

  • Transactions today
    2,943,7796Active
  • Authentication success, %
    99.1Normal
  • Availability, % this month
    99.78Normal
  • Grievances open
    298Watch
All rails operationalGCRI · Digital Public Infrastructure

Throughput

Rails

Identity verify3500.5Normal
Instant payment6120.3Normal
Data exchange6930.7Normal
Offline fallbackn/an/aStandby
DPI service health: the screen's structure, terms and states for Interoperability and apis.Placeholder names and illustrative values; a design, not a record or a live system.

Fig.DPI service health. Design wireframe with placeholder names and illustrative values, not a record or a live system.

01In brief

The short answer.

Interoperability is the ability of systems run by different agencies and firms to exchange data and use it with shared meaning. Common standards let systems speak, APIs expose capabilities under defined rules, semantic agreement keeps meaning intact, and governance keeps exchanges working over time.

02Geography

Connected activity in India.

For interoperability and apis, in GCRI's spatial-intelligence reading, the map opens on night lights, true-colour imagery and population density with true colour from NASA GIBS, framed on India; every other NASA layer, live feed and forecast waits in the layer list.

The interactive map needs JavaScript; the layer list and sources are below.

Layers 3

Connected activity, for this page

Latest available

NASA GIBS / EOSDIS · ASTER GDEM (METI, NASA) · Blue Marble (NASA) · © OpenStreetMap contributors (ODbL) · Natural Earth

Loading the latest NASA imagery.

Drag to move. Ctrl or ⌘ and scroll, pinch or the buttons to zoom; hover for the values under the pointer; reset returns to the region.

For interoperability and apis, in GCRI's spatial-intelligence reading, the map opens on night lights, true-colour imagery and population density with true colour from NASA GIBS, framed on India; every other NASA layer, live feed and forecast waits in the layer list.Satellite and model products as NASA publishes them, each with its own date; indicators, not assessments of any place; claim ceiling INTEGRATED.

Data: NASA GIBS · ASTER GDEM · Blue Marble · © OpenStreetMap contributors · Natural Earth · Copernicus Sentinel-2 L2A · NASA HLS S30Sources and licences

  • We acknowledge the use of imagery provided by services from NASA's Global Imagery Browse Services (GIBS), part of NASA's Earth Science Data and Information System (ESDIS). Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • We acknowledge the use of imagery provided by services from NASA's Global Imagery Browse Services (GIBS), part of NASA's Earth Science Data and Information System (ESDIS). Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • VIIRS Black Marble night-time lights, NASA Goddard Space Flight Center; distributed by the NASA Level-1 and Atmosphere Archive and Distribution System (LAADS DAAC); imagery via NASA GIBS. Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • VIIRS near-real-time products (flood, land surface temperature, snow cover, corrected reflectance), NASA LANCE; imagery via NASA GIBS. Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • Center for International Earth Science Information Network (CIESIN), Columbia University. 2018. Gridded Population of the World, Version 4 (GPWv4): Population Density, Revision 11. NASA Socioeconomic Data and Applications Center (SEDAC). Licensed under CC BY 4.0. Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). CC BY 4.0
  • MODIS land products (vegetation indices, gross primary production, land cover), NASA LP DAAC and LANCE; imagery via NASA GIBS. Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • ASTER GDEM is a product of METI and NASA (ASTER Global Digital Elevation Model V003, NASA LP DAAC); imagery via NASA GIBS. Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • Made with Natural Earth. Free vector and raster map data @ naturalearthdata.com. Public domain
  • © OpenStreetMap contributors (ODbL), via NASA GIBS (coastlines, boundaries, roads and place names). Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). ODbL
  • Blue Marble, NASA Earth Observatory; imagery via NASA GIBS. Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • Context on the globe and flat map: coastlines, boundaries, roads and place names from NASA GIBS reference layers (OpenStreetMap data, ODbL, © OpenStreetMap contributors); Blue Marble imagery as an optional base; 3D terrain and the elevation read-out from the ASTER GDEM elevation colour index (5 m to 200 m classes, exaggerated for legibility). Boundaries are drawn as published and imply no position on any territory.
  • Globe: MapLibre GL JS 6.9.1, BSD-3-Clause, © MapLibre contributors.
  • Observed (EO): Copernicus Sentinel-2 L2A (contains modified Copernicus Sentinel data 2026), Microsoft Planetary Computer
  • Observed (EO): NASA HLS S30 (contains modified Copernicus Sentinel data 2026). We acknowledge the use of imagery provided by services from NASA's Global Imagery Browse Services (GIBS), part of NASA's Earth Science Data and Information System (ESDIS).
  • Optional layers (35 sources in the layer list: live, forecast, observed and context) print their provider credit on the map and here when switched on; forecasts are model output and derived indices are estimates.

Layers and dates

  • Night-time lights, daily: VIIRS Black Marble (VNP46A2), NASA LAADS DAAC · 12 Oct 2026
  • True colour: VIIRS NOAA-20 corrected reflectance, NASA LANCE · 13 Oct 2026
  • Population density, 2020: Population: CIESIN, Columbia University, Gridded Population of the World v4.11 (2018), NASA SEDAC, CC BY 4.0 · static
  • Land cover type (IGBP), yearly: MODIS Terra and Aqua land cover (MCD12Q1), NASA LP DAAC · 2024
  • Enhanced vegetation index, rolling 8 days: MODIS Terra EVI, NASA LANCE · 13 Oct 2026
  • Vegetation greenness (NDVI), rolling 8 days: MODIS Terra NDVI, NASA LANCE · 13 Oct 2026

03The question

Interoperability and apis: how the risk develops.

Standards, exchange and reliability. The dossier below sets out how the risk develops, what is measured, where the data come from, how it is modelled and who decides.

Mechanism

Standards make systems speak

Common data formats, vocabularies and protocols let systems exchange information without bespoke links for every pair.

Mechanism

APIs expose capabilities

Well-documented interfaces let other systems use a service, such as verifying identity or initiating a payment, under defined rules.

Mechanism

Meaning must match

Technical connection is not enough. Systems must agree on what data mean, or exchanges produce errors.

Mechanism

Governance keeps it working

Someone must maintain standards, approve participants, monitor use and resolve disputes, or interoperability decays over time.

04Key terms

Terms used on this page.

Each term as this page uses it. Where a standard-setting body defines the term, the wording follows that body.

TermDefinition
Semantic interoperabilityAgreement on the meaning of exchanged data so that systems interpret it the same way.
Data exchange layerShared infrastructure through which organizations exchange data securely under common rules.
API catalogueA published list of available interfaces with documentation and terms of use.
05Indicators

What is measured, and how well.

Each indicator carries its unit, its cadence, the kind of source behind it and the evidence label a value would carry. No values are shown: a programme supplies them under its own authority.

IndicatorUnitCadenceSource typeLabel
Government services with open APIscountper assessmentAPI cataloguesOBSERVED
Data exchange transactions between agenciescountmonthlyExchange platform logsOBSERVED
Systems conforming to national interoperability standardspercent of systemsper assessmentConformance testingOFFICIAL
Reuse of shared componentscount of services using shared componentsper assessmentArchitecture inventoriesDECLARED
API availabilitypercent of timemonthlyMonitoringOBSERVED
Interoperability frameworks adoptedstatusper assessmentPolicy reviewOFFICIAL
06Canvas

From sources to decisions.

The topic as a computational graph: named sources feed the methods, an evidence review gates the outputs, and the decisions stay with the authorities that hold them.

Pipeline canvas · Interoperability and apis as a run graphDesign, not a record
Interoperability and apis: a public service over digital public infrastructureA person proves who they are, consents to share data, the agency exchanges data through agreed interfaces, pays through the switch, and any grievance is redressed; every step is auditable. Design of the process, not a record of a run.

Fig. 02Nodes carry their type, two metric rows and a state; connectors show what feeds what; dashed frames name the owners; the timeline is the cadence. Design of the pipeline, not a record of a run.

07Sources

Where the evidence comes from.

Named public datasets and institutional records, each with its licence class. Sources by agreement are used only under their terms and never republished.

SourceWhat it givesLicence class
European Interoperability Framework and Interoperable Europe ActPrinciples and legal basis for public sector interoperabilityPublic, EU terms
X-Road documentation (Nordic Institute for Interoperability Solutions)Open-source data exchange layer used by several governmentsOpen source, MIT licence
OECD Digital Government Index and studiesDigital government practices across countriesPublic, OECD terms
National API cataloguesPublished government APIsOpen, licence per catalogue
GovStack specificationsBuilding block specifications for digital governmentOpen, licence to check
08Decisions

Who decides, and what the evidence serves.

Digital Public Infrastructure prepares evidence. The decisions below are taken by the authorities named, under their own rules, and never by the platform.

Who decidesThe questionEvidence this page serves
Digital government agenciesWhich standards and exchange layers to adoptMaturity reviews; standards evidence
Standards bodiesWhich specifications to maintain and updateConformance evidence
Service ownersHow to publish and secure APIsAPI quality assessments

Outputs this topic produces

  • Interoperability maturity reviews
  • API catalogue and quality assessments
  • Semantic alignment guides for common data
  • Evidence notes for interoperability governance
09Core questions

What experts ask.

Interoperability is what turns separate digital systems into infrastructure. It lets agencies share records instead of asking citizens to carry documents, lets payment providers connect to each other and lets states change vendors without rebuilding everything. Poor interoperability leads to duplicated systems, data silos and lock-in. But interoperability also spreads failures and data more widely, so it must be designed with security and rights in mind.

  • Which standards and interfaces are used, who governs them and are they open for anyone to implement?
  • Are data models and meanings shared, so that exchanged data are understood consistently?
  • How reliable are interfaces under load, and what happens to dependent services when one fails?
  • Can a component be replaced by another provider without breaking the systems around it?
10Mechanisms

Drivers and processes.

Interoperability works at technical, semantic, organizational and legal levels.

Technical

Interfaces and protocols

APIs, message formats and security protocols that let systems connect. Versioning and documentation determine whether they stay usable.

Semantic

Shared meaning

Common data models and code lists so that a field means the same thing in every system. Mismatches cause silent errors.

Organizational

Agreements and governance

Who maintains standards, how changes are agreed and what legal basis permits each exchange.

Many interoperability failures are not technical. Two agencies may use the same standard but define a household or an address differently; a ministry may lack the legal mandate to share data that it technically can exchange; a vendor may implement a standard with proprietary extensions. Durable interoperability therefore needs governance that keeps standards, meanings and legal permissions aligned over time.

11Methods and data

How the evidence is built, and its limits.

  1. 01

    Standards analysis

    Review of standards for openness, maturity and adoption. A standard that is open on paper may still be closed in practice if implementation is costly.

  2. 02

    Conformance testing

    Tests that implementations follow a standard. Passing tests is necessary but not sufficient for real-world interoperability.

  3. 03

    Reliability monitoring

    Interface availability and latency data, applying data engineering, interoperability and stewardship. Operators may not publish them.

  4. 04

    Architecture review

    Analysis of how components connect and where single points of failure or lock-in arise.

13Questions

Questions and answers.

What is interoperability?
The ability of different systems and organizations to exchange data and use it with shared meaning, across technical, semantic, organizational and legal levels.
What is an API?
An application programming interface, a defined way for one software system to request data or services from another.
What is X-Road?
An open-source data exchange layer, first developed in Estonia, that lets public and private systems exchange data securely.
Does open source mean interoperable?
No. Open-source code can still use closed data formats, and proprietary systems can implement open standards. Interoperability depends on standards and governance.
Is more interoperability always better?
Not without safeguards. Every new connection is a path for data and for failure, so exchanges should be purposeful, secured and governed.
Does the platform publish standards?
No. It analyses standards and their use. Standards are developed by the bodies that govern them.
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