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API Evangelist LLC

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apis.ioUpdated

APIs.io is a catalog and search engine profiling API providers, their APIs, and artifacts.

Overview

APIs.io is a search engine and catalog for the API economy — profiling API providers, their APIs, and the machine-readable artifacts they publish, along with ratings, rankings, and analysis built on top. It is operated by API Evangelist LLC.

Mission statement

To help developers and organizations discover, evaluate, and engage with API offerings across industries.

Read recently by Perplexity, Meta

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What we offer

APIs.io

Find, compare, and govern APIs through a comprehensive searchable catalog.

Pricing not published

apis.io/

Market segments

Market size by segment

Growth potential (CAGR)

API discovery and marketplace

0.8 Billion USD25% CAGR

Capabilities for searching, browsing, comparing, and rating public and private APIs to accelerate discovery, procurement, and developer adoption.

Products: APIs.io

API catalog and governance

5.2 Billion USD15% CAGR

Centralized cataloging of API providers and APIs linked with governance artifacts, metadata, taxonomy, and lifecycle controls to support governance and compliance.

Products: APIs.io

API specification and artifact registry

0.3 Billion USD25% CAGR

Indexing, management, and retrieval of machine-readable API artifacts (OpenAPI, AsyncAPI, GraphQL, JSON-LD, schemas, headers) to enable reuse, validation, and toolchain integration.

Products: APIs.io

Event API discovery and orchestration

2 Billion USD15% CAGR

Discovery and integration of event channels and modeling of API-based workflows (real-time event processing and Arazzo workflows) to support event-driven architecture and integrations.

Products: APIs.io

More information about our offering

APIs.io

APIs.io is a search engine and catalog for the API economy. It profiles API providers, their APIs, and the machine-readable artifacts they publish, and presents ratings, rankings, and analysis to help discover, compare, and govern API surfaces.

Pricing not published

  • Evaluate Provider Readiness
    Provides a standardized score for API offerings based on verifiable data, assisting users in making informed decisions.
  • Access Diverse Artifacts
    Offers a rich repository of artifacts for developers, enabling easy access to various API specifications and guidelines.
  • Centralized API Information
    Enables users to access comprehensive metadata and governance documents related to APIs for better compliance and usage.
  • Model API Processes
    Facilitates integration and orchestration of multiple APIs into workflows, enhancing automation and efficiency.
  • Integrate Real-Time Events
    Streamlines communication between disparate systems by automatically triggering workflows based on specific events.
  • Enhance Discoverability
    Empowers users to efficiently find specific APIs and related documentation through advanced search capabilities.
  • Explore by Industry
    Helps users identify relevant APIs quickly based on industry requirements and specific use cases.

Sources

Methodology and sourcing behind the figures and links shown above.

API discovery and marketplace

Estimation based on published figures for the broader API management and adjacent network-API segments in the search results. MarketsandMarkets (cited in Devico) places the API management market at $5.1B (2023) with a 32.9% CAGR; network-API forecasts show much smaller but fast-growing subsegments (USD 0.55B in 2024; USD 7.6B by 2030). Treating API discovery & marketplace as a specialized subset of API management (approx. 10–20% share, midpoint ~15%) yields ~USD 0.75B, rounded to USD 0.8B. Growth potential (CAGR ~25%) reflects strong demand for discovery, monetization, and AI-driven developer experiences—below the overall API-management CAGR but still high given adoption and marketplace monetization trends.

API catalog and governance

Used the Hybrid Integration Platform market (USD 34.7B in 2025, 14.8% CAGR) as the primary anchor from search results and treated API catalog & governance as a focused subset of integration/API management. Assumed API cataloging, governance and lifecycle controls represent roughly 15% of the broader hybrid integration/API management spend (34.7B * 15% ≈ 5.2B). Growth potential aligned with the hybrid integration CAGR (~14.8%) and was rounded conservatively to 15% given accelerating demand for governance driven by API sprawl, security, and compliance.

API specification and artifact registry

Primary source: TH Global Capital estimates the global DevOps market at $16.1B (2025) rising to $43.2B (2030). The API specification & artifact registry segment maps to capability areas listed (artifact repository, API management) and is a small subset of DevOps/platform tooling. Assuming a 1–3% share of the 2025 DevOps platforms market (midpoint 2%) yields ~ $0.32B, rounded to $0.3B. Growth potential: the DevOps platforms CAGR implied by the source (~22%) is adjusted slightly upward to ~25% CAGR for API-spec/artifact registries due to accelerating API-first practices, platform engineering, and increased reuse/automation demands.

Event API discovery and orchestration

Estimated by positioning "Event API discovery and orchestration" as a niche overlap of API access management, data-integration/streaming integration, and event-focused booking/orchestration tools. Comparable segments in the search results: API Access Management (~USD 1.73B in 2026; 15.2% CAGR), broader data-integration/platforms (global base ~USD 17.57B in 2025; NA $7.44B in 2025 at 12.1% CAGR), and event booking software (USD 4.22B in 2026; 28.25% CAGR). Combining these benchmarks and the niche’s narrower scope (discovery, event-channel integration, API-based orchestration) yields an estimated current market size ~USD 2.0B and a strong growth potential near ~15% CAGR driven by adoption of event-driven architectures, streaming integration, and API-first orchestration.

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