One API catalog for every API in your enterprise — searchable, versioned, and always current. Self-service discovery for platform teams, API developers, and enterprise architects.
// Definition
An API catalog is the central inventory of every API in your enterprise — think product catalog, but for interfaces. It bundles OpenAPI, AsyncAPI, GraphQL, and SOAP specifications into a single searchable surface.
At its core, it solves three problems: API sprawl (too many unknown interfaces), shadow APIs (production APIs without documentation), and redundancy (the same functionality built multiple times). With self-service discovery, every integration becomes a matter of minutes, not weeks.
Unlike an API gateway or a docs-only platform, a modern API catalog combines discovery, versioning, access control, and governance in one system — the single front door to your entire API portfolio.
// Terminology
An API catalog goes by different names in enterprise contexts — the function is the same: the central inventory of every API in your organization.
In our work with Fortune-500 enterprises and fintechs we have built API catalogs with 500+ interfaces — backed by 15+ years of experience in API governance.
Particularly relevant for platform teams scaling API products, enterprise architects running compliance audits, and API developers who want self-service discovery instead of Slack archaeology.
// Capabilities
Every API format in one place — OpenAPI, AsyncAPI, RAML, SOAP, GraphQL, and Arazzo. No more documentation scattered across repos and wikis.
Full-text search, filters, and tags — find any API in seconds. Search across titles, descriptions, endpoints, and schema fields.
Organize APIs by business groups, domains, and subdomains. Clear API structure for any organization size.
// Organization & structure
Organize APIs hierarchically by business groups, domains, and environments. Whether it is 10 internal APIs in one department or 10,000+ APIs across a global enterprise — the API catalog mirrors your organization and scales with it. Each business group gets its own access rights, each environment its own version state. Your API portfolio stays searchable and governance-ready, even at hundreds of teams.
// Industries
Centralized API management is especially valuable in heavily regulated environments — where audit trails, compliance evidence, and multi-tenant governance are non-negotiable. The standards listed below describe requirements for your APIs — the portal supports them with versioning, access control, and a complete audit trail.
PSD2/XS2A, FinTS, Open Banking, SWIFT, EBICS — interfaces documented and versioned with a complete change trail for internal and external compliance reviews.
HL7 FHIR, KIM interfaces, medical device APIs, and patient portals — GDPR-compliant hosting in the EU plus role governance for clinicians, labs, and payers.
SAP IDoc and S/4HANA APIs, IoT telemetry, COVESA VSS, and vehicle-to-cloud — audit trails along the automotive supply chain as the basis for UNECE R155, ISO 21434, and TISAX evidence.
XÖV standards, government portals, eHealth, telco APIs (TM Forum Open APIs) — multi-tenant with full mandant isolation and EU hosting.
// Comparison
Many teams document APIs in Confluence pages, Git repositories, or Excel sheets. That doesn't scale — a dedicated API catalog solves three core problems.
API documentation in a wiki goes stale within weeks. No search index across specs, no automatic sync with the code.
API catalog: auto-synced from the OpenAPI spec.
Only developers with repo access find the spec. No API-level access control, no self-service discovery for consumers.
API catalog: self-service with role-based rights.
Hand-maintained, no interactivity. No schema validation, no changelog, no versioning of API contracts.
API catalog: try-it-out, schema validation, versioning.
// FAQ
Short answers for platform teams and enterprise architects.
Get in touch// Discover more
// Deep dive
From format comparison to discovery layer to versioning logic — from the api-portal.io resources hub.
Definition, capabilities, and tools — what sets an API catalog apart from a wiki, Git repo, or Excel sheet.
Read articleHierarchical tags, the QUERY method, and streaming markers — the format updates for modern API catalogs.
Read articleFormat background: how Swagger and OpenAPI relate in 2026 and which version applies where.
Read articleExperience the platform built for modern API management.