AI Catalog manifest · Explorium

Explorium

Explorium serves an AI Catalog manifest at /.well-known/ai-catalog.json on explorium.ai, declaring 4 agentic resources that a discovery service can index without asking anyone’s permission.

Open the live manifest → Explorium provider profile

Structural grade · AI Catalog 1.0

Flavored

Fails a hard check in the data model. A catalog in spirit rather than in schema.

ARD conformance-test v0.9.1 (ards-project/ard-spec)

PASS

Run against this exact body with the project’s own conformance CLI.

Discovery path

predecessor

Answered only at /.well-known/ai-catalog.json. ARD v0.91 renamed the path to /.well-known/ard.json and made the old one an optional courtesy, so a consumer implementing only the current spec will not find this manifest.

Declared spec version

1.0

The specVersion in the manifest. 1.0 is current for the AI Catalog data model; anything lower is an earlier draft. ARD reads this field as transport-defined and ignores it.

⚠ Hard checks failed. An ARD client cannot assume this manifest parses to the model the specification defines.

host-no-identifier

Optional affordances missing. None of these break a client, but each one costs the publisher search relevance or verifiability.

content-type-not-ai-catalog-json
entry-no-representativeQueries

4 entries

4 media types

3 representative queries

4 trust manifests

Host identifier: none

What this manifest advertises

Explorium Business Data Hub (MCP)

urn:air:explorium.ai:server:business-data-hub

Hosted MCP server for B2B company and prospect search, matching, enrichment and business event signals. OAuth required.

application/mcp-server-card+json artifact →

“find software companies in Germany with more than 200 employees”
“enrich this list of domains with funding and headcount”
“which of my accounts raised a round in the last quarter”

Explorium Business Data Hub (A2A)

urn:air:explorium.ai:agent:business-data-hub

Agent-to-agent descriptor for the same capabilities, for clients that discover over A2A rather than MCP.

application/a2a-agent-card+json artifact →

Explorium REST API

urn:air:explorium.ai:api:rest

OpenAPI 3.1 description of the REST API: company and prospect search, match, enrichment and events. Authenticates with an api_key header.

application/vnd.oai.openapi+json artifact →

Explorium agent skills index

urn:air:explorium.ai:skills:index

Capability-level view of the platform, one level above the individual MCP tools.

application/json artifact →

How it is served

The publishing guide asks for three things at the transport layer, because a crawler is the consumer that matters and a crawler is a browser-shaped client.

HTTPS only — yes (HTTP 200)
Content-Type: application/json — yes
Access-Control-Allow-Origin: * — yes

Evidence. Fetched https://explorium.ai/.well-known/ai-catalog.json on 2026-09-13, HTTP 200. The verbatim body is stored alongside its manifest in the Explorium repository as ai-catalog/explorium-ai-catalog.json. Nothing on this page is derived or generated: an AI Catalog manifest is served from the publisher’s own domain or it does not exist, which makes it — like an A2A Agent Card — one of the few agent artifacts that cannot be produced on a provider’s behalf. Grades are recomputed on every build; the specification is a v0.9 draft and these verdicts will move when it does.

Work with this as data

Every descriptor here is available over the APIs.io API and to AI agents over MCP. Agent Discovery is not yet its own endpoint on the v1 API. Reach it through catalog search and the tag graph, or the MCP server.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for agent discovery

3 MCP tools reach this

apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

Search the catalog

curl "https://apis.io/api/v1/search?q=explorium&limit=10"

Everything under a tag

curl "https://apis.io/api/v1/tags/explorium"

Discovery needs no key. Ratings and market analysis are Pro.

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