Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →

Exemplar 1 Complete, well-documented, and agent-ready

OracleNet A2A AgentA2A 0.3 JSON-RPC agent at https://tooloracle.io/a2a/jsonrpc (message/send, tasks/*, push-notification confi...69.1

Strong 1 Solid coverage with minor gaps

ArthurAI Agent Discovery APIThe Agent Discovery API from ArthurAI — 2 operation(s) for agent discovery.58.7

Developing 13 Usable, with meaningful gaps to close

Photon Agent discovery APIMachine-readable discovery resources for agents and integrations.52.7 AgentMesh MCP ServerHosted streamable-HTTP MCP server at https://app.agentmesh.link/mcp (MCP protocol 2025-06-18, server versio...52.4 AgentMesh Network APIThe AgentMesh REST API on https://app.agentmesh.link — 48 operations generated by FastAPI and served anonym...52.4 Agent2Agent (A2A)Agent2Agent (A2A) is an open protocol that lets AI agents built by different organisations, on different fr...50.4 TARX Courier and Souls APIPlain REST endpoints on tarx.com documented only for visiting AI agents in we.txt, skill.md and courier.md:...50.3 Agent Directory (DIR)Distributed announce and discovery of multi-agent systems. gRPC-first, with services for storage (content-a...48.4 AgentSearch HTTP APIPublic, no-auth HTTP API for AgentSearch, Luther Systems' daily-scored index of AI agents and MCP servers, ...46.9 brick.blue Hub APIThe REST surface of the hub on https://brick.blue/api/v1 — 144 operations over 133 paths, served anonymousl...44.6 kimetsu.dev Agent GatewayCredential-free, read-only JSON discovery API on agents.kimetsu.dev (OpenAPI 3.1.0, 15 operations): the gat...44.4 Marz Greta-Lock Network A2A Agent CardA2A agent card served at /.well-known/agent-card.json (aliases /.well-known/agent.json and /.well-known/age...43.5 GRITH Gate A2A AgentThe A2A 1.0 JSON-RPC bridge at https://grithgate.com/api/a2a (also on grithland.com and grithhold.com), des...42.7 Machine Realms A2A AgentAgent2Agent 1.0 surface: an agent card at https://machinerealms.com/.well-known/agent-card.json (version ne...42.3 Machine Realms Network APIPublic HTTP+JSON surface indexed at https://machinerealms.com/api/v1 and /.well-known/machine-realms.json: ...42.3

Thin 3 Limited public surface area

Direct Hire A2A Meta-AgentDirect Hire's A2A v1.0 discovery agent, published at /.well-known/agent-card.json with a JSON-RPC interface...33.4 Direct Hire APIREST API for the Direct Hire agent network: public discovery (directory, search, stats, health, per-agent A...33.4 Priorflow Intelligent Agent/Service Selector APIOne operation: POST /v1/select with JSON {query, top_n?, constraints?, weights?, caller_agent?} returns ord...31.8

Emerging 2 Early or largely undocumented

BotMarket MCP ServerRemote Model Context Protocol server at https://botmarket.bot/mcp (JSON-RPC 2.0 over HTTP, POST only, proto...23.5 BotMarket REST APIAnonymous JSON read surface for the BotMarket directory at https://botmarket.bot/v1 — documented in llms.tx...23.5

Minimal 1 Almost no public developer surface

Asgardian Village A2A Agent CardA2A agent card served at https://asgardian-village.grok.me/.well-known/agent-card.json (HTTP 200, applicati...8.8

Companies reaching this through an API (6)

These companies publish an API, specification or operation carrying “Agent Discovery” but do not classify their business under it. Listed unranked and kept out of the count above, because one tagged operation is not a statement about what a company does.

Agentic AI Foundation ArthurAI GRITH Marz Greta-Lock Network Photon TARXAN

Score breakdown

Frequency

42.5

log-scaled weighted occurrences

Breadth

0.4

spread across providers

Quality lift

54.7

mean composite of providers using it

Cohesion

1.8

strength of nearest seed neighbor

Where this tag comes from

Api tag21

Provider tag14

Openapi tag2

Openapi op tag5

Work with this as data

Every tag here is available over the APIs.io API and to AI agents over MCP.

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Tools for tags

7 MCP tools reach this

find_tagsBrowse and filter every tag in the catalog.
get_cohortThis tag as a scored cohort — every provider carrying it, with scores.
cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.
cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.
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

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This tag

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All tags

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As a scored cohort

curl "https://apis.io/api/v1/cohorts/tag/agent-discovery"

The distribution (Pro)

curl "https://apis.io/api/v1/cohorts/tag/agent-discovery/stats" \
  -H "X-API-Key: $APIS_IO_KEY"

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Agent Discovery

Providers using this tag (14)

APIs with this tag (21)