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

Photon Agent discovery APIMachine-readable discovery resources for agents and integrations.66.8

Strong 3 Solid coverage with minor gaps

Airia Agent Discovery APIThe AgentDiscovery API from Airia — 1 operation(s) for agentdiscovery.65.7 ArthurAI Agent Discovery APIThe Agent Discovery API from ArthurAI — 2 operation(s) for agent discovery.63.9 OracleNet A2A AgentA2A 0.3 JSON-RPC agent at https://tooloracle.io/a2a/jsonrpc (message/send, tasks/*, push-notification confi...62.2

Developing 8 Usable, with meaningful gaps to close

AgentMesh MCP ServerHosted streamable-HTTP MCP server at https://app.agentmesh.link/mcp (MCP protocol 2025-06-18, server versio...53.5 Agent2Agent (A2A)Agent2Agent (A2A) is an open protocol that lets AI agents built by different organisations, on different fr...52.1 Agent Directory (DIR)Distributed announce and discovery of multi-agent systems. gRPC-first, with services for storage (content-a...51.8 tender-agents-com Agent Discovery APIThe agent-discovery API from tender-agents-com — 7 operation(s) for agent-discovery.50.7 TARX Courier and Souls APIPlain REST endpoints on tarx.com documented only for visiting AI agents in we.txt, skill.md and courier.md:...50.4 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...47.2 Machine Realms A2A AgentAgent2Agent 1.0 surface: an agent card at https://machinerealms.com/.well-known/agent-card.json (version ne...40.6 Machine Realms Network APIPublic HTTP+JSON surface indexed at https://machinerealms.com/api/v1 and /.well-known/machine-realms.json: ...40.6

Thin 2 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...38.4 GRITH Gate A2A AgentThe A2A 1.0 JSON-RPC bridge at https://grithgate.com/api/a2a (also on grithland.com and grithhold.com), des...38.2

Emerging 3 Early or largely undocumented

Priorflow Intelligent Agent/Service Selector APIOne operation: POST /v1/select with JSON {query, top_n?, constraints?, weights?, caller_agent?} returns ord...25.6 BotMarket MCP ServerRemote Model Context Protocol server at https://botmarket.bot/mcp (JSON-RPC 2.0 over HTTP, POST only, proto...24.0 BotMarket REST APIAnonymous JSON read surface for the BotMarket directory at https://botmarket.bot/v1 — documented in llms.tx...24.0

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...6.6

Companies reaching this through an API (8)

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 Airia ArthurAI GRITH Marz Greta-Lock Network Photon TARXAN tender-agents-com

Score breakdown

Frequency

40.1

log-scaled weighted occurrences

Breadth

0.2

spread across providers

Quality lift

52.9

mean composite of providers using it

Cohesion

1.3

strength of nearest seed neighbor

Where this tag comes from

Api tag18

Provider tag14

Openapi tag4

Openapi op tag13

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7 MCP tools reach this

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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.

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Agent Discovery

Providers using this tag (14)

APIs with this tag (18)