stale · -0.5

Open Standard

Score 15.5 / 100 12 providers 11 APIs Search apis.io →

Providers using this tag (12)

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Developing 1 Usable, with meaningful gaps to close
FDC3FDC3 (Financial Desktop Connectivity and Collaboration Consortium) is an open standard hosted by FINOS for ...6 APIs46.8
Thin 7 Limited public surface area
Cloud FoundryCloud Foundry is an open-source, multi-cloud Platform as a Service (PaaS) governed by the Cloud Foundry Fou...12 APIs32.9Open Connectivity for Tours, Activities, and AttractionsOCTO (Open Connectivity for Tours, Activities, and Attractions) is an open standard API specification for t...4 APIs32.6MatrixMatrix is an open standard and decentralized protocol for real-time communication, providing federated mess...20 APIs31.6AMQPAMQP (Advanced Message Queuing Protocol) is an open standard for message-oriented middleware governed by OA...1 API29.9SAMLSAML (Security Assertion Markup Language) is an XML-based open standard for exchanging authentication and a...3 APIs28.7FINOSThe Fintech Open Source Foundation (FINOS) is a Linux Foundation project dedicated to open source innovatio...34 APIs28.4SpaceAPISpaceAPI is an open standard for hackerspaces, makerspaces, fablabs, and similar community spaces to publis...1 API27.2
Emerging 4 Early or largely undocumented
Agentic AI FoundationThe Agentic AI Foundation (AAIF) is a Linux Foundation project formed in December 2025 that brings together...2 APIs21.7BrunoBruno is an open-source (MIT), git-native API client - a lightweight, offline-first alternative to Postman ...5 APIs21.2Citation File FormatThe Citation File Format (CFF) is a human- and machine-readable YAML schema for providing citation metadata...6 APIs19.7FOCUS (FinOps Open Cost and Usage Specification)FOCUS, the FinOps Open Cost and Usage Specification, is an open standard maintained under the FinOps Founda...1 API17.7

APIs with this tag (11)

Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →

Developing 5 Usable, with meaningful gaps to close
FDC3 App Directory APIThe FDC3 App Directory (AppD) is a REST API standard for registering and discovering financial desktop appl...46.8FDC3 Context DataFDC3 Context Data defines a standard set of typed data structures used to carry information between financi...46.8FDC3 Desktop Agent APIThe FDC3 Desktop Agent API is the primary interface for application interoperability on the financial deskt...46.8FDC3 Desktop Agent BridgingFDC3 Desktop Agent Bridging (DAB) is a wire protocol that enables multiple Desktop Agent implementations to...46.8FDC3 IntentsFDC3 Intents are standardized verbs that applications use to request functionality from other applications ...46.8
Thin 4 Limited public surface area
Open Service Broker APIThe Open Service Broker API is the open specification originally developed by Cloud Foundry and now used by...32.9Common Cloud ControlsFINOS Common Cloud Controls is an open standard project that describes consistent controls for compliant pu...28.4Common Domain ModelThe Common Domain Model (CDM) is a standardized, machine-readable, and machine-executable model that repres...28.4FDC3FDC3 is an open standard for financial desktop interoperability, defining how applications launch, share co...28.4
Emerging 2 Early or largely undocumented
Model Context Protocol (MCP)The Model Context Protocol (MCP) is an open-source standard for connecting AI applications to external syst...21.7OpenCollection FormatOpenCollection is the open, YAML-based collection format Bruno now recommends for new collections as an alt...21.2

Score breakdown

Frequency
34.6
log-scaled weighted occurrences
Breadth
0.3
spread across providers
Quality lift
33.7
mean composite of providers using it
Cohesion
0.0
strength of nearest seed neighbor

Where this tag comes from

Api tag11
Provider tag8