Definition: The API Contract Service ABB is a technology service that defines and publishes formal interface contracts for APIs (operations/endpoints, request/response structures, error models, security requirements and versioning). It enables consistent implementation and validation of interfaces across different providers and platforms, supporting interoperable digital public services. Source: OpenAPI/WSDL/AsyncAPI specifications Last modification: 2026-02-02 Identifier: http://data.europa.eu/dr8/APIContractService LOST view: Technical view - infrastructure EIRA concept: eira:ArchitectureBuildingBlock ABB name: eira:APIContractServiceTechnologyService Synonym: API Specification , Interface Contract Example: OpenAPI (REST) contract , WSDL (SOAP) contract , AsyncAPI contract Interoperability Saliency: The API Contract Service is salient for technical interoperability because it standardises interface specifications (syntax, semantics, security and versioning) independently of implementation technology and deployment. Interoperability Dimension: Structural IoP Additional identifier: http://data.europa.eu/dr8/APIContractService EIF Layer: TechnicalInfrastructure