# ARD Registry API

**Canonical:** https://apis.io/apis/agentic-resource-discovery/ard-registry-api/  
**Provider:** Agentic Resource Discovery (ARD) — https://apis.io/providers/agentic-resource-discovery/  
**Documentation:** https://agenticresourcediscovery.org/spec/

ARD Registry API is one of 2 APIs that [Agentic Resource Discovery (ARD)](https://apis.io/providers/agentic-resource-discovery/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include Discovery, Search, and Federation. The published artifact set on APIs.io includes an OpenAPI specification and API documentation.

The discovery interface a conformant Agent Registry exposes. POST /search is the only mandatory endpoint and takes a natural-language `text` query plus optional structured `filter`, returning catalog entries ranked 0-100 by semantic relevance. POST /explore returns facet aggregations over the matched set, GET /agents is deterministic paged browsing. This is the standard's own contract, not an implementation of it — the OpenAPI declares no server, because every registry is its own host, discovered through an application/ai-registry+json entry in a manifest.

## Machine-readable artifacts (5)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/agentic-resource-discovery/refs/heads/main/openapi/_original/ard-discovery-openapi.yml
- **Specification** — https://agenticresourcediscovery.org/spec/
- **Documentation** — https://agenticresourcediscovery.org/how_ard_works/
- **TestSuite** — https://raw.githubusercontent.com/api-evangelist/agentic-resource-discovery/refs/heads/main/conformance/README.md
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/agentic-resource-discovery/refs/heads/main/apis.yml

## Other Agentic Resource Discovery (ARD) APIs (1)

- [AI Catalog Manifest](https://apis.io/apis/agentic-resource-discovery/ai-catalog-manifest/)

## Tags

Discovery, Search, Federation

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/agentic-resource-discovery/ard-registry-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/agentic-resource-discovery/.