# Aggregation

**Canonical:** https://apis.io/providers/aggregation/  
**Website:** https://apievangelist.com  
**APIs profiled:** 0

An index and topic collection covering API aggregation, marketplaces, directories, unified APIs, and catalog platforms. API aggregation brings together multiple APIs under a single interface, simplifying integration, reducing maintenance overhead, and enabling consistent authentication and data normalization across disparate services. This collection includes API marketplaces like RapidAPI, unified API platforms like Merge and Apideck, API directories like APIs.guru and APIs.io, web scraping aggregators, and open-source catalog tools like Backstage.

## Kin Score — 8.7 / 100 (minimal)

Scored 2026-10-17 under rubric 0.24.0. Trend: flat (+0.1 from 8.6).

| Facet | Score |
|---|---|
| Discoverability | 39.3 |
| Contract Quality | 14.7 |
| Contract Governance | 0.0 |
| Operational Transparency | 5.3 |
| Developer Ergonomics | 9.5 |
| Access Clarity | 0.0 |

Regulatory layer — **Horizontal (data, software, accessibility, platform)**: 4.9 (matched via fallback).

## Agent readiness — 0.0 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## Use cases (5)

- **Unified HR and CRM Integration** — Unified API platforms like Merge and Apideck enable applications to sync with dozens of HR systems (BambooHR, Workday, ADP) through a single normalized API.
- **API Marketplace Distribution** — API providers publish their APIs to marketplaces like RapidAPI to reach new developer audiences and monetize access through tiered subscription plans.
- **Internal API Governance** — Organizations use API catalogs like Backstage or Stoplight to document, version, and govern internal APIs across product teams.
- **Financial Data Aggregation** — Platforms like Plaid and Codat aggregate financial account data from banks and accounting systems into normalized APIs for fintech applications.
- **AI Agent Tool Federation** — Aggregation platforms like Composio expose hundreds of third-party APIs as unified tool sets that AI agents can discover and invoke.

## Tags

API Aggregation, API Directory, API Marketplace

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/aggregation/). Scores are computed from the provider's own public artifacts under a published rubric.