A2A
Variants seen in the corpus:
Agent to Agent ProtocolAgent-to-AgentAgent2AgentAgent CardA2A
Providers using this tag (424)
Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.
Exemplar 69 Complete, well-documented, and agent-ready
Live Direct MarketingAPIs.ioSalesforceNylasSMKlogCustomer.ioCDataXquikRedoclyCloudflareAgoragenticKitElation HealthUpholdTabbyGhostBirdeyePauboxRelevance AIActiveCampaignBoom AiLeadpingMandateShieldHive CivilizationOneSignalAutomation AnywhereThanxDifyAtlassianParallellemlistDelxHiltSCVD General StoreDrippayIBANforge0xArchiveMicrosoft Azure API ManagementFireflies.aiFeedOracle TechnologiesTextQLUnifyCracked APITaskHawk SystemsDynamic FeedVidyardXBindbeeDeBounceGitDealFlowGoogleEdge ImpulseDensifyClixAlgoVoiFodda (PSFK)Gemini Trust CompanyBlnk FinanceContext.devProfoundiDenfyImmutableAPI EvangelistScope3SpadeIntegrationOSSignSealShip Partner APIStructifyHightouch
Strong 106 Solid coverage with minor gaps
The Ainglish ProjectGreen HelixcogDepotIBMSendcloudSpeakeasySeamless.AIServiceNowPeople Data LabsVirix LabsTaskfolkHumanMirrorRelmSyllableExploriumLacunaShieldLabsAgent ReadyPostizBooking.comThe ColonyWebCrawlerAPIInstantlyRoxyAPIClayGivebutterBenchmark EmailKonbiniAPIMetriportRhombus SystemsMolTrustCymeticaMatch It UpKoalaSeekrFirstPromoterEnv0ClosedLoop AISpace FrontiersGr4vyaicomglobalRefuelHeronBrand API (Brandfetch)Nefesh AIHookLogic (Criteo)PyannoteAIMagic HourAgent DiscoDant3FarmDash Agent HubChronosphereNavatticxCuresFullEnrichAbstract APIiwant.fyiNumbers OnlineIntegration.app (Membrane)SendsparkFieldPulseDeployxaSmartleadememUltravioleta DAOWhisper SecurityCriteoPineconeinvinoveritasMERCURYCelloPostalFormPagesnapCurlecbroke2builtSendosoAtomadic TechAI SquaredApideckEndgamebrick.blueSift StackSirenicmakeup.landLindyRevenueBaseCONNSKILLBiconomyLeadpagesLVL LTD COtemp.mdSiroApstalBlock LottosFasten HealthANP2APIMeshAb180MavenlinkPerfect CorpAirMDRClawSpanOcientCopper.coAgentsPodium2s
Developing 130 Usable, with meaningful gaps to close
AgentGatewayOpplevagentWunderCorpPaulieB14AgentCheckSNHPA2A402Hive Agent IQHORIZON SHIELDTerabase EnergyBudgetPixelBuiltWithOptionsAhoyAmbrVaultfire ProtocolClaixCustomerOSStarbridgeRett fra BondenRockerboxXGuardPixeltableCanFlyAntimetalReevoMove Home Organisation CICSylvia APIChainAware.aiInterfazeTypeSafe AIPlyriumAgentMeshOrthogonalViewsMeetSSSNACKKann KI das? Sponsoring AgentABBYYSolvelaThe HogMacaroon NetworkBrunoTARXANDecision AnchorPictomancer.aiTrustBoost PII SanitizerLuther SystemsMoirai LabsSAPAutomation Preflight APILokkiMonacoClawdChat 虾聊Confido LegalEnfuceEqualsSandboxAQCoin RailzAGNTCYAgentic AI FoundationEmotiveSeam AIHergert SynthoraTrueFoundryAfriexAvalixWagerXAgent Health MonitorHilosAgent ExchangeCharitySensePhos LabsPolycodeDigital AssetPydanticAIInfinite AudiencePermutiveingest0rNeuralVerge APIAngelListanchor-x402Piknik.SpotRenooLabVerified Digital Agents (VDA)SegmentStreamSeshat MarketsAI Crawler IndexPolicyCheck01MindMUJ428anewKimetsuGRITHPhi LongevityAgent ZeroNeuronto ARD RegistryNovita AIPrivateDAOSuperDialCybleHostDeFiBerrerToAPIsLiquid AgentMarz Greta-Lock NetworkMachine RealmsRazorpayMicrosoft Azure AI FoundryLangChainCo-Legalmicro1PoolPartyRosenticRS PerformanceCarettaPOLICYANDPLAY LTDNameWhisperTofuSchemaSureKineticaSarj AI Developer APIFinn-tannlegeAGENTUMLuminary LaneWarpPay402 StudioSuperscaleBMC XIVTavilyThe Culture CommonsAUX by PrdictionEdgeGONNA
Thin 63 Limited public surface area
A2AParkArtem / A2A SandboxPriorflowopenclaw / evm-labX402 AI 自助门店Kaxo Technologies昆仑瑶池 (Kunlun Yaochi)agent402.devTESSA Marketing & Technology11xOpenSeaChilledSitesRequestyAppliedAI (AAICO)Cape PartnersFinite StateKG-NINJAAgMsgSINCORDEUSPROOFKong AI GatewayLangSmithAIScanAnloraAVORA Agent ForgeMerchant-0AgentWorldQoreviaDirect HireSunny Yuenliars.townWRONG BEAUTY 000 / THE SWARMAgent Failure Mode RegistryMycelnetTeamwork.comGogsQuickNodeVelvtScro Orphan DeskChado StudioWikiKVScrapflyFutureverseUrantia PapersMonday.comIntentGuardSalesgraphHeliusDELTA Witness — Trust Layer for Autonomous ActionsHaneruToGenie-us SoftwareARAKEL Machine Evidence NetworkInworld AITravel WorldallagentsEventEdge OraclePerkoonp0stmanPrimitivewhitecloverModel Context Protocol (MCP)SursaTechAI City Social Town
Emerging 35 Early or largely undocumented
sapjilcodingdigiantnzVerse (autonomous agent)WilliamOPC / 彼岸花开KOA LabsWib&Wob (symbients)Grok & MonArt BlocksReDocScalpStreamGlifMeowIRIZ PlatformAfterQueryAgentic Resource Discovery (ARD)SageoxForterElderly Care MatchHealth Universe1inchAttioGensparkMoney You're OwedJake GaylorR.E. Merrill & AssociatesAgent BenchFastMCPStack AuthStreamkapStacklokTanoRelaySavvlyAPEX
Minimal 20 Almost no public developer surface
Unrated 1 Not yet scored
APIs with this tag (214)
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 23 Complete, well-documented, and agent-ready
Agoragentic A2A AgentAgent2Agent protocol surface: a conformant agent card served from https://agoragentic.com/.well-known/agent...MandateShield Payment Authority Agent (A2A)JSONRPC A2A interface at https://mandateshield.com/a2a serving A2A 1.0 and 0.3 profiles (selected by the A2...Hive Civilization A2A AgentAgent-to-agent surface: A2A agent cards on the apex (protocolVersion 0.3.0, six HiveAttest/HiveWallet/HiveG...Hive Civilization A2a APIThe a2a API from Hive Civilization — 9 operation(s) for a2a.ForceDream A2A AgentAgent2Agent (A2A) protocol surface: a signed (ES256 JWS, kid in /.well-known/jwks.json) agent card served f...Delx A2a APIThe A2a API from Delx — 2 operation(s) for a2a.Delx Agent Operations Protocol (A2A)JSON-RPC A2A endpoint at https://api.delx.ai/v1/a2a exposing methods/list, agents/register, message/send, h...Hilt Pay Agent Gateway (MCP + A2A)Hosted MCP server at https://api.hilt.so/mcp (streamable HTTP, protocol 2025-06-18, server Hilt Pay Agent G...SCVD Evidence Agent (A2A)Agent2Agent protocol surface: an agent card served from https://scvd.store/.well-known/agent-card.json (and...SCVD General Store A2a APIThe A2a API from SCVD General Store — 4 operation(s) for a2a.Kong Agent GatewayKong Agent Gateway is a capability of Kong AI Gateway (GA April 2026 with AI Gateway 3.14) that governs age...Kong AI GatewayKong AI Gateway is the connectivity and governance layer for AI-native applications. Built on Kong Gateway,...OracleNet A2A AgentA2A 0.3 JSON-RPC agent at https://tooloracle.io/a2a/jsonrpc (message/send, tasks/*, push-notification confi...Dynamic Feed A2A AgentA2A 1.0 JSON-RPC agent at https://dynamicfeed.ai/a2a with a JWS-signed agent card (graded conformant) decla...GitDealFlow A2A AgentAgent-to-Agent (A2A 0.3.0) JSON-RPC 2.0 endpoint implementing message/send, tasks/get and tasks/cancel over...Inbox Check A2A Agent CardProvider-shaped agent card at https://check.live-direct-marketing.online/.well-known/agent.json listing 21 ...LDM.delivery A2A AgentA2A 0.3.0-shaped agent card served at https://api.live-direct-marketing.online/.well-known/agent.json (237 ...Live Direct Marketing A2A APIThe A2A API from Live Direct Marketing — 1 operation(s) for a2a.Live Direct Marketing Agent Card APIThe Agent Card API from Live Direct Marketing — 8 operation(s) for agent card.Emboss A2A AgentAgent2Agent interface at https://api.getemboss.ai/a2a (JSON-RPC, A2A 1.0) discovered through a signed agent...Clix A2A AgentAgent2Agent (A2A) protocol surface: a public agent card at https://api.clix.so/.well-known/agent-card.json ...AlgoVoi A2a APIThe A2a API from AlgoVoi — 12 operation(s) for a2a.Fodda Research Agent (A2A)Agent-to-Agent endpoint at mcp.fodda.ai/a2a (JSONRPC, A2A protocolVersion 0.3.0) discovered from https://ww...
Strong 46 Solid coverage with minor gaps
cogDepot A2A AgentThe broker itself as an A2A agent: a signed (EdDSA, JWKS at api.cogdepot.com/.well-known/jwks.json) Agent C...cogDepot A2a APIThe A2A JSON-RPC 2.0 endpoint that an A2A client reaches from the Agent Card. Unauthenticated and free.Human Browser A2A AgentAgent2Agent protocol surface: an agent card (protocolVersion 0.3.0, JSONRPC, version 5.1.0) served byte-ide...Relm A2A AgentAgent2Agent (A2A 0.3.0) JSON-RPC endpoint at https://api.relmcrm.com/a2a. A message/send whose data part is...Lacuna A2A AgentAgent-to-Agent JSON-RPC endpoint at https://www.lacuna.fm/a2a advertising the "Lacuna Music" agent card at ...Agent Ready A2A AgentAgent2Agent (A2A) surface: a signed agent card served from https://agent-ready.dev/.well-known/agent-card.j...WebCrawlerAPI Agent CardA2A-style agent card served from https://webcrawlerapi.com/.well-known/agent-card.json describing "WebCrawl...Airia Agent Card APIThe AgentCard API from Airia — 2 operation(s) for agentcard.Gravitee AI Agent ManagementGravitee AI Agent Management brings the API management discipline to agentic AI ecosystems. It is delivered...MolTrust A2a APIThe A2a API from MolTrust — 2 operation(s) for a2a.Match It Up NetworkBot A2A AgentAgent-to-Agent surface for the NetworkBot — an A2A agent card at https://matchitup.in/.well-known/agent-car...Machine Library A2A AgentA2A (protocolVersion 0.3.0) research and commerce agent at https://machinelibrary.ai/a2a over JSON-RPC: gro...aicomglobal A2A AgentAgent2Agent (A2A) protocol surface: an agent card served from https://aicomglobal.com/.well-known/agent-car...Nefesh Human State Agent (A2A)A2A agent served from the MCP host: card at https://mcp.nefesh.ai/.well-known/agent-card.json, JSON-RPC 2.0...Dant3 Discovery Agent (A2A)A2A 1.0 agent (JSON-RPC binding) that returns machine-readable entry points for the Dant3 network, machine ...iwant.fyi A2A AgentAgent-to-Agent endpoint at https://iwant.fyi/api/a2a (JSON-RPC message/send and tasks/get) that needs no ke...Numbers Online A2A AgentAn Agent-to-Agent (A2A protocolVersion 0.3.0, JSONRPC) endpoint at POST https://numbers.online/api/v1/a2a e...emem A2A AgentAgent-to-agent surface: synchronous JSON-RPC message/send at POST /a2a/tasks, an async task extension at /v...emem A2a APIThe A2a API from emem — 7 operation(s) for a2a.emem Agent Card APIThe Agent Card API from emem — 1 operation(s) for agent card.Execution Market A2A AgentA2A protocol 0.3.0 JSON-RPC agent at api.execution.market/a2a/v1 advertising seven skills (publish task, ma...Ultravioleta DAO A2A APIThe A2A API from Ultravioleta DAO — 4 operation(s) for a2a.Whisper A2A AgentAgent2Agent surface: an A2A 1.0-shaped card at https://whisper.online/.well-known/agent-card.json (version ...Whisper Security A2a APIThe A2a API from Whisper Security — 1 operation(s) for a2a.invinoveritas A2A AgentA2A agent "invinoveritas-reasoning-agent" (protocolVersion 0.3.0, JSONRPC transport) at https://api.babyblu...MERCURY Web Fetch A2A AgentAgent-to-Agent (A2A 0.3.0) surface for "MERCURY Web Fetch", published as a conformant agent card at https:/...PostalForm A2A AgentAgent2Agent (A2A) surface: an agent card served from https://postalform.com/.well-known/agent-card.json (pr...Council of AI A2a APIThe A2a API from Council of AI — 1 operation(s) for a2a.Council of AI Measurement Agent (A2A)Agent2Agent v1.0 surface: an agent card served from https://councilof.ai/.well-known/agent-card.json (appli...GPT55 Model Gateway A2A AgentAgent2Agent surface: an agent card served at https://gpt55.558686.xyz/.well-known/agent-card.json (and iden...Corti Agentic Framework APIBuild and orchestrate healthcare agents over the A2A protocol with prebuilt medical experts and MCP tool in...brick.blue A2A agentJSON-RPC A2A door at https://brick.blue/a2a, advertised by a JWS-signed agent card at /.well-known/agent-ca...Sirenic A2A AgentAgent2Agent JSON-RPC endpoint exposing the 116 paid routes as A2A skills (skill ids are the OpenAPI path te...CONNSKILL Growth Services A2A AgentA2A merchant agent (protocolVersion 0.3.0, JSON-RPC at agent.connskill.com/a2a) whose card at /.well-known/...LVL LTD CO A2a APIThe A2a API from LVL LTD CO — 1 operation(s) for a2a.LVL LTD Skill Market A2A AgentAgent2Agent surface: an Ed25519-JWS-signed agent card (protocolVersion 1.0.0, JSONRPC transport, version 1....temp.md A2A Publisher AgentA2A 1.0 agent ("temp.md Publisher") reachable over JSON-RPC at https://api.temp.md/a2a with three skills - ...Blazing Bullet Private Limited A2a APIThe a2a API from Blazing Bullet Private Limited — 5 operation(s) for a2a.ANP2 A2A AgentAgent2Agent (A2A) protocol surface: an agent card at https://anp2.com/.well-known/agent-card.json (protocol...ANP2 A2a APIThe A2a API from ANP2 — 4 operation(s) for a2a.ClawSpan A2A APIAgent-to-agent JSON-RPC + signed agent card.ShardLink Control Plane A2A AgentAgent-to-Agent (A2A 0.3.0) surface of the ShardLink control plane: a JSON-RPC endpoint at https://app.claws...AgentsPodium A2A APIThe public agent-to-agent directory.AgentsPodium Hosting A2A AgentThe hosting service as an A2A agent (protocol 0.3.0, JSON-RPC message/send at https://a2a.agentspodium.com/...APIClaw A2a APIThe a2a API from APIClaw — 5 operation(s) for a2a.2s A2A AgentAgent2Agent (A2A) protocol surface: an agent card served from https://2s.io/.well-known/agent-card.json (pr...
Developing 78 Usable, with meaningful gaps to close
HORIZON SHIELD Femtech Source Registry MCPA separate product line by the same company: a neutral, verifiable registry of femtech information sources ...HORIZON SHIELD KIRA A2A AgentAgent2Agent surface of the same service: a JWS-signed agent card at https://mcp.horizonshield.dev/.well-kno...JIDEC Verification Ledger APIAppend-only, Bitcoin-anchored (OpenTimestamps) public ledger of the verification process at https://ledger....OptionsAhoy Equity Planner (A2A Agent)Agent2Agent (A2A) protocol surface: an agent card served from https://optionsahoy.com/.well-known/agent-car...Ambr A2A AgentAgent-to-Agent JSON-RPC endpoint at https://getamber.dev/api/a2a implementing message/send, tasks/get and t...Claix A2A AgentNative Agent-to-Agent (A2A 0.3) JSON-RPC agent at /a2a with a public agent card at /.well-known/agent-card....Rett fra Bonden A2A AgentA2A JSON-RPC 2.0 endpoint at https://rettfrabonden.com/a2a (message/send, tasks/get, tasks/list, agent/auth...Rett fra Bonden A2a APIThe A2a API from Rett fra Bonden — 1 operation(s) for a2a.Rett fra Bonden MCP ServerRemote MCP server (Streamable HTTP, protocol 2025-06-18 negotiated) at https://rettfrabonden.com/mcp with 1...AgentGatewayAgentGateway provides AI-native gateway capabilities for routing LLM traffic, federating MCP tools, enablin...XGuard A2A AgentAgent2Agent surface: an agent card served identically from https://api.xguardgate.com/.well-known/agent-car...CanFly.ai Hosted Agent Cards (A2A)Per-agent A2A-shaped agent cards served from the platform host for every public marketplace agent at https:...MoveHome.org A2A Agent Registry APIPublic registry of real-estate A2A agents operated by MoveHome, exposed two ways. REST under https://moveho...MoveHome.org A2A Property AgentAgent2Agent (A2A 0.3.0) surface: an agent card served from https://movehome.org/.well-known/agent-card.json...ChainAware A2A Agent and x402 APIAgent-facing surface on api.chainaware.ai: an A2A 0.3.0 agent card at /.well-known/agent-card.json (also at...AgentMesh A2a APIThe A2a API from AgentMesh — 1 operation(s) for a2a.AgentMesh A2A GatewayJSON-RPC A2A endpoint at https://app.agentmesh.link/a2a, advertised by the agent card served at /.well-know...ViewsMeet Participation A2A AgentA2A v1.0 agent (JSON-RPC binding at https://viewsmeet.com/api/agent/a2a) with one skill, curated-either-or-...SSSNACK A2A AgentAgent2Agent protocol surface: an A2A 1.0 agent card served with media type application/a2a+json at https://...Kann KI das? Sponsoring Agent (A2A)Read-only Agent2Agent JSON-RPC endpoint at https://kannkidas.de/api/a2a described by the agent card at /.we...IAB Tech Lab A2a APIThe A2a API from IAB Tech Lab — 1 operation(s) for a2a.Macaroon Network A2A AgentAn Agent2Agent 0.3.0 endpoint at https://api.macaroonnetwork.com/a2a (JSON-RPC; message/send, tasks/get and...Macaroon Network A2a APIThe A2a API from Macaroon Network — 2 operation(s) for a2a.Decision Anchor A2A AgentAgent2Agent protocol surface: a signed agent card (protocolVersion 1.0, JSONRPC, version 1.3.42, Ed25519 JW...Pictomancer.ai A2A AgentAgent-to-Agent endpoint at https://api.pictomancer.ai/a2a (JSON-RPC) described by a published agent card — ...TrustBoost A2A AgentAgent2Agent surface: an agent card served from https://api.trustboost.dev/.well-known/agent-card.json (vers...AgentSearch A2A AgentAgent2Agent surface for AgentSearch — an agent card at https://agentsearch.luthersystems.com/.well-known/ag...API7.ai A2A APIThe A2A API from API7.ai — 2 operation(s) for a2a.API7.ai APIAPI7.ai API as documented publicly: 29 operations. Contract generated from the documentation by API Evangel...InsideOut A2A AgentAgent2Agent surface for InsideOut — an agent card at https://insideout.luthersystems.com/.well-known/agent-...Moirai Agents API (A2A + MCP)A2A 1.0 agent ("A2A-compatible analytics and contract intelligence agent", version 0.1.0) with 11 skills — ...ClawdChat 虾聊 A2a APIThe a2a API from ClawdChat 虾聊 — 16 operation(s) for a2a.Agent2Agent (A2A)Agent2Agent (A2A) is an open protocol that lets AI agents built by different organisations, on different fr...Autonoma A2A AgentAgent2Agent (A2A) protocol surface: an agent card served from https://avalix.ai/.well-known/agent-card.json...WagerX A2a APIThe A2a API from WagerX — 1 operation(s) for a2a.Wagie A2A AgentA2A JSON-RPC endpoint accepting A2A 1.0 SendMessage and 0.3.0 message/send for bounded iGaming and regulato...The Agent Exchange Clearing HouseThe agent-to-agent task market at https://exchange.agentexchange.work: agents register a free reputation pa...Phos Labs MCP ServerHosted, remote Model Context Protocol server. POST https://mcp.phoslabs.io/mcp is Streamable HTTP behind OA...marginalia A2A AgentAgent2Agent (A2A) surface for marginalia: an agent card served from https://marginalia.polycode.co.uk/.well...Infinite Audience A2A APIAgent-to-Agent task protocolOpplevagent A2A AgentA2A JSON-RPC 2.0 endpoint at https://opplevagent.no/a2a described by a signed agent card (protocolVersion 1...Opplevagent A2a APIThe A2a API from Opplevagent — 1 operation(s) for a2a.Piknik.Spot A2A AgentAgent-to-Agent (A2A 1.0) agent served from the provider's own host: the agent card at /.well-known/agent-ca...Piknik.Spot A2a APIThe A2a API from Piknik.Spot — 1 operation(s) for a2a.RenooLab A2A AgentRead-only Agent2Agent surface: an A2A 1.0 JSON-RPC endpoint at https://a2a.renoolab.fr/a2a whose card (serv...VDA Onboarding AgentAdmission authority for the suite — an A2A agent (6 skills) that runs holder-binding (DID-auth), intake and...PolicyCheck A2A AgentJSON-RPC 2.0 Agent-to-Agent endpoint at https://policycheck.tools/api/a2a, discovered through an A2A agent ...01Mind A2A AgentAgent2Agent (A2A) protocol surface: an agent card served from https://01mind.net/.well-known/agent-card.jso...Aurelius Agent A2A APIAgent-to-Agent (A2A 0.3.0) JSON-RPC surface for Aurelius Agent, WunderCorp's strategic planning and orchest...MUJ428 Trust Reflex A2A AgentAgent2Agent surface: an agent card served from https://agents.muj428.com/.well-known/agent-card.json (name ...anew A2a APIAgent2Agent (A2A) protocol JSON-RPC endpoint.Kimetsu A2A APIDeterministic guidance; no delegated actions or writes.Sidequest Commons Guide (A2A)A2A agent (JSON-RPC; 0.3 message/send by default, 1.0 SendMessage with A2A-Version 1.0) that returns determ...GRITH Gate A2A AgentThe A2A 1.0 JSON-RPC bridge at https://grithgate.com/api/a2a (also on grithland.com and grithhold.com), des...Phi Longevity PRISM A2A AgentA2A 1.0 agent (JSON-RPC at https://philongevity.com/a2a) with one skill — chronic-disease records consolida...Agent Zero A2A AgentAgent2Agent surface: an agent card served from https://onchainagentintel.io/.well-known/agent-card.json (mi...Berrer A2a APIThe A2a API from Berrer — 2 operation(s) for a2a.BerrerGate A2A AgentAgent2Agent surface: an agent card served from https://api.berrergate.com/.well-known/agent-card.json (cont...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...Machine Realms A2A AgentAgent2Agent 1.0 surface: an agent card at https://machinerealms.com/.well-known/agent-card.json (version ne...Co-Legal Public Assistant (A2A Agent)Agent2Agent 1.0 surface of Co-Legal's public legal/fiscal assistant. The agent card at https://agent.co-leg...PoolParty Agent Concierge (A2A)Agent2Agent surface: an A2A 0.3.0 agent card served at https://www.poolparty.io/.well-known/agent-card.json...Rosentic A2A AgentAgent2Agent protocol surface: an agent card served from https://api.rosentic.com/.well-known/agent-card.jso...RS Performance A2A AgentPublic A2A agent for automotive intents — OBD DTC lookup, vehicle diagnostics, repair services, EV/hybrid a...AgentCheck A2A AgentAgent2Agent (A2A 0.3.0) surface of the same service - a conformant agent card at /.well-known/agent-card.js...AgentCheck A2a APIThe A2a API from AgentCheck — 1 operation(s) for a2a.Archestra AI A2A APIThe A2A API from Archestra AI — 5 operation(s) for a2a.fetch-price A2A AgentAgent-to-Agent surface declared by the A2A 1.0.0 agent card at https://fetch-price.com/.well-known/agent-ca...Name Whisper A2A AgentThe agent-to-agent surface: an anonymous A2A 0.3.0 JSON-RPC endpoint at https://namewhisper.ai/a2a whose ag...Finn-tannlege A2A AgentThe agent-to-agent surface: an anonymous A2A JSON-RPC 2.0 endpoint at https://finn-tannlege.com/a2a impleme...Finn-tannlege A2a APIThe A2a API from Finn-tannlege — 1 operation(s) for a2a.University of Amsterdam A2a APIThe a2a API from University of Amsterdam — 5 operation(s) for a2a.AGENTUM Business A2A AgentAgent2Agent (A2A) protocol surface of AGENTUM Business: an agent card at https://business.agentum.lat/.well...Agno A2A APIThe A2A API from Agno — 15 operation(s) for a2a.A2A402 Agent Work Router (A2A)The Agent2Agent JSON-RPC 2.0 endpoint declared by the agent card: message/send returns a stateless A2A Mess...The Culture Commons A2A AgentAgent2Agent (A2A) surface: an agent card served from https://culture.sbs/.well-known/agent-card.json (proto...AUX A2A Agent (JSON-RPC)A2A 1.0 JSON-RPC interface for the AUX Evidence and Certification agent, exposing twelve bounded skills (bu...LEGIT A2A Agent CardAgent card served from https://legit.gonna.bond/.well-known/agent.json and, byte-identical, from the canoni...
Thin 43 Limited public surface area
Kunlun Yaochi A2A JSON-RPC APIThe agent-to-agent surface named in the company's A2A agent card: a JSON-RPC 2.0 endpoint exposing 16 metho...TESSA A2A AgentA2A agent (protocolVersion 0.3.0, JSONRPC) for TESSA Marketing & Technology with nine skills — services cat...TESSA Marketing & Technology A2a APIThe A2a API from TESSA Marketing & Technology — 1 operation(s) for a2a.Cape Partners Agent Exchange (A2A)The A2A 1.0 surface of the Cape Partners agent exchange: SendMessage, GetTask and ListTasks on both the JSO...Finite State A2A Content APIPublic, anonymous, read-only JSON-RPC 2.0 API exposing Finite State's published content: blog posts, resour...Agent Verification Utility A2A AgentAgent2Agent (A2A) 1.0 surface: an agent card served from https://agent-economy.kgninja.dev/.well-known/agen...KG-NINJA A2a APISynchronous A2A 1.0 JSON-RPC quote preparationSINCOR Agent Swarm A2A APIA2A 1.0.1 agent surface over JSON-RPC 2.0 exposing sixteen skills. Discover via the agent card, quote a ski...DEUSPROOF A2A AgentAgent2Agent surface: a signed (JWS EdDSA, kid = the register's did:key) A2A 1.0 agent card at https://deusp...Kong Agent GatewayKong Agent Gateway is a capability of Kong AI Gateway (GA April 2026 with AI Gateway 3.14) that governs age...AIScan A2A AgentAgent2Agent (A2A) protocol surface: an agent card served from https://getaiscan.app/.well-known/agent-card....Merchant-0 A2A AgentAgent2Agent (A2A) surface: an agent card served from https://merchant-0.com/.well-known/agent-card.json (wi...AgentWorld Concierge (A2A)Anonymous A2A 1.0 discovery concierge. Its agent card at /.well-known/agent-card.json declares four skills ...Qorevia A2a APIThe A2a API from Qorevia — 1 operation(s) for a2a.Qorevia Universal Agent Gateway (MCP + A2A)The free discovery and routing layer in front of the paid tools, served from the same origin. MCP: https://...Direct Hire A2A Meta-AgentDirect Hire's A2A v1.0 discovery agent, published at /.well-known/agent-card.json with a JSON-RPC interface...liars.town A2A AgentAgent-to-Agent endpoint at https://liars.town/a2a (JSON-RPC 2.0, message/send) declared by the agent card s...THE SWARM A2A AgentAgent2Agent discovery surface: an A2A 0.3.0 agent card served at https://swarm-api.wrongbeauty.com/.well-kn...Agent Failure Mode Registry A2a APIThe A2a API from Agent Failure Mode Registry — 1 operation(s) for a2a.A2APark A2A AgentThe Park's agent-to-agent surface: an anonymous A2A 0.3.0 JSON-RPC endpoint whose single method, message/se...Mycelnet A2A AgentMycelnet's agent-to-agent surface: an anonymous A2A 0.3.0 JSON-RPC endpoint at https://mycelnet.ai/a2a desc...Velvt A2A AgentVelvt's Agent2Agent door — an anonymous JSON-RPC 2.0 message/send endpoint at https://www.velvt.ai/api/a2a ...Scro Orphan Desk A2A agent cardAn A2A 0.3.0 agent card served at https://dualregistry.dev/.well-known/agent-card.json (and byte-identical ...Chado Studio A2a APIThe A2a API from Chado Studio — 2 operation(s) for a2a.crvUSD Yield Optimizer A2A AgentAgent2Agent surface of the same service: an agent card at https://llama.box/yo/.well-known/agent.json (prot...WikiKV A2A AgentAgent-to-Agent endpoint (JSON-RPC and HTTP+JSON bindings at /a2a, interface protocolVersion 1.0) exposing o...LiteLLM A2A Agent Gateway APIProvides /a2a endpoints for the Agent-to-Agent (A2A) gateway, enabling agent registration, publishing, and ...Artem / A2A Sandbox A2a APIThe A2a API from Artem / A2A Sandbox — 1 operation(s) for a2a.Priorflow Intelligent Agent/Service Selector APIOne operation: POST /v1/select with JSON {query, top_n?, constraints?, weights?, caller_agent?} returns ord...Sandbox Contractor Agent (A2A)Agent2Agent protocol surface: an agent card served from https://a2a.elonsusk.com/.well-known/agent-card.jso...b612 A2A AgentAgent2Agent (A2A) protocol surface: an agent card served from https://mcp.hakuto-0209.com/.well-known/agent...onchain-risk-oracle A2A AgentAgent2Agent (A2A) protocol surface: an agent card at https://oracle.evebrief.org/.well-known/agent-card.jso...Travel World A2A AgentAgent-to-Agent surface declared by the A2A 1.0 agent card at https://travel.augworlds.ai/.well-known/agent-...X402 AI 自助门店 A2A AgentThe store's agent-to-agent surface: an anonymous A2A 0.3 JSON-RPC endpoint the agent card points at, where ...X402 AI 自助门店 A2a APIThe A2a API from X402 AI 自助门店 — 1 operation(s) for a2a.FleetHelp Support Agent (A2A)Agent2Agent (A2A) surface: an agent card served from https://fleethelp.ai/.well-known/agent.json (protocolV...allagents Operator (A2A Agent)The directory as an A2A agent. POST a JSON-RPC 2.0 message/send stating a need ("I need a translation agent...Perkoon Agent Data Layer (A2A)Perkoon's agent-to-agent surface: an A2A agent card served at /.well-known/agent-card.json and the legacy /...Zero A2A Agentp0stman's agent-to-agent surface: an A2A agent card for "Zero" served at /.well-known/agent-card.json (and ...whiteclover A2A AgentAgent2Agent (A2A) protocol surface: an agent card served from https://whiteclover.ai/.well-known/agent-card...whiteclover A2A APIThe Agent2Agent JSON-RPC endpoint.SursaTech AI Advisor A2A APIAn A2A 1.0 agent (JSON-RPC 2.0 over HTTP POST, streaming declared) exposing ten skills: get_company_profile...AI City Social Town A2A APISingle JSON-RPC 2.0 endpoint (POST https://aicity.jiademin2688.top/a2a) through which external agents join ...
Emerging 21 Early or largely undocumented
Korean News Agent (A2A)Agent2Agent agent at https://news-agent.songt50.us — a JSON-RPC 2.0 endpoint at the host root (POST only) w...Korean Public Data Agent (A2A)Agent2Agent agent at https://publicdata-agent.songt50.us — a JSON-RPC 2.0 endpoint at the host root (POST o...GanjaMon AI A2A AgentAgent2Agent (A2A) protocol surface: an agent card served from https://grokandmon.com/.well-known/agent-card...AirScoutMachine-payable air-quality queries over x402 with global coverage: current US AQI and pollutant breakdown ...BorderScoutMachine-payable US border-crossing queries over x402. Ranks all 85 US ports of entry by all-in time - the d...FuelScoutMachine-payable cheapest-fuel queries over x402. Station-level prices for Spain, France and Italy and offic...RecallScoutMachine-payable US recall lookups over x402. Given a product, brand, ingredient or vehicle (make/model/year...ScalpStream ResearchMachine-payable, impersonal research feeds over x402: ranked 0-30 DTE options candidates (/picks), dividend...IRIZ Platform A2A Interop AgentA2A agent card ("IRIZ Platform Agent", version 1.0.0, protocolVersions ["0.3","A2A-1.4"]) served at the leg...Casdoor MCP GatewayCasdoor's MCP (Model Context Protocol) gateway and A2A (Agent-to-Agent) protocol surface, designed to broke...Elderly Care Match A2A AgentAgent2Agent (A2A 1.0) surface: an agent card at https://www.elderlycarematch.com/.well-known/agent-card.jso...a2a-browser A2A AgentPay-per-search web agent (version 0.1.0-alpha) served from a2a-browser.digiant.nz: a JSON-RPC 2.0 POST endp...Verse A2A AgentAgent2Agent surface declared by the card at https://api.verse-me.com/.well-known/agent.json (version 2.0.0,...Money You're Owed Catalog Agent (A2A)A2A 1.0 agent ("Money You're Owed catalog agent", version 1.0.0) with a JSONRPC binding at https://agent.mo...Jake Gaylor A2A AgentA2A agent representing Jake Gaylor, discovered at /.well-known/agent-card.json on ai.jakegaylor.com (and as...R.E. Merrill & Associates A2A APIThe same line finder over the Agent2Agent protocol v1.0 (JSON-RPC 2.0).RE Merrill Pump Application Agent (A2A)Agent2Agent protocol surface: a JWS-signed (ES256, JWKS at /.well-known/jwks.json) A2A v1.0 agent card at h...Agent Bench Travel MerchantSeller agent for flight search and travel checkout, exposed on one host through two protocol doors: A2A JSO...Agent Communication Mesh GatewayThe join gateway for Agent Communication Mesh. One anonymous mutating operation, POST /attach, takes a Disc...Relay A2A AgentA2A JSON-RPC 2.0 endpoint for the Relay agent, deployed as a Val Town val. GET on the root returns a plain-...China On-Site Video Service (A2A agent)A2A agent operated by Lei Zhang: you provide a Google Maps link or coordinates of any place in China and a ...
Minimal 3 Almost no public developer surface
Bot Hub (A2A)Anonymous A2A 0.3.0 agent at https://baconhollow.com (JSON-RPC, POST only). Four skills: portfolio-status, ...Neva A2A AgentNeva's agent-to-agent surface: an anonymous A2A 0.3.0 JSON-RPC endpoint at the root of neva.dt-agent.co.uk ...Asgardian Village A2A Agent CardA2A agent card served at https://asgardian-village.grok.me/.well-known/agent-card.json (HTTP 200, applicati...
Companies reaching this through an API (14)
These companies publish an API, specification or operation carrying “A2A” 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.
1F916
Agno
Airia
API7.ai
APIClaw
Archestra AI
Blazing Bullet Private Limited
Casdoor
Corti
Council of AI
IAB Tech Lab
Kong
LiteLLM
University of Amsterdam
Score breakdown
Frequency
77.1
log-scaled weighted occurrences
Breadth
10.0
spread across providers
Quality lift
53.2
mean composite of providers using it
Cohesion
16.7
strength of nearest seed neighbor
Where this tag sits
Related tags
A2A Verified 326 co-occurrences
x402 93 co-occurrences
Agent-Native 147 co-occurrences
Agents 182 co-occurrences
MCP 267 co-occurrences
AI Agents 135 co-occurrences
Agentic Commerce 55 co-occurrences
Where this tag comes from
Provider tag442
Api tag215
Openapi tag48
Openapi op tag168
Markets provisional
Kin Score markets whose measured providers carry this tag. Share is the fraction of the market's measured providers that carry it — it describes the market, not this tag.
| Market | Share of the market's providers |
|---|---|
| AI Agents (A2A agent cards) | 74% |
| Typed Decision Models | 27% |
| Commerce and CRM | 24% |
Cohort brief
Auto-generatedThe 435 providers in the APIs.io catalog tagged A2A, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.
Providers
435
of 441 in the catalog
Mean Kin Score
49.4
+26.5 vs catalog 22.9
Mean Agent Readiness
39.2
+27.3 vs catalog 11.9
Spread
1.2–93.2
median 51 · σ 17.7
How the 435 split by band
Exemplar 73Strong 114Developing 132Thin 68Emerging 32Minimal 16
Facet averages, against the whole catalog
| Facet | This cohort | Catalog | Difference | Scored |
|---|---|---|---|---|
| Developer Ergonomics | 57.4 | 23.2 | +34.2 | 435 |
| Access Clarity | 53.1 | 26.5 | +26.6 | 435 |
| Operational Transparency | 40.1 | 13.7 | +26.4 | 435 |
| Contract Quality | 42.4 | 17.6 | +24.8 | 435 |
| Discoverability | 72 | 58.1 | +13.9 | 435 |
| Contract Governance | 17.4 | 6.3 | +11.1 | 435 |
A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.
What this cohort publishes
| Artifact | This cohort | Catalog | Difference |
|---|---|---|---|
| MCP server (any) | 81% | 14% | +67 |
| MCP server (first-party) | 80% | 12% | +68 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 32% | 11% | +21 |
| Security | 100% | 98% | +2 |
| Arazzo workflows | 4% | 2% | +2 |
| Governance rules | 15% | 14% | +1 |
mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.
Top by Kin Score
- 1 Nylas 93.2
- 2 Salesforce 91
- 3 APIs.io 90.1
- 4 Xquik 88.7
- 5 CData 84.4
- 6 Customer.io 83.8
- 7 Redocly 82.6
- 8 Cloudflare 80.6
- 9 Agoragentic 79.8
- 10 Kit 78.5
Top by Agent Readiness
- 1 Xquik 91.4
- 2 OneSignal 75.4
- 3 APIs.io 75.3
- 4 Primitive 75.2
- 5 ClosedLoop AI 74.2
- 6 Agent Ready 72.9
- 7 Cloudflare 72.5
- 8 Sirenic 70.9
- 9 Taskfolk 69.2
- 10 Ultravioleta DAO 69.1
All 441 members of this roster resolve to a provider in the
catalog; 435 carry a score (99%).
The figures above describe the scored members only.
Coverage caveat. 290 of 435 scored members had under half their catalog-attributable points satisfied at all (catalog_earned / catalog_max < 0.5). They are INCLUDED in the mean above. A large share here means the cohort mean is partly a measurement of how far our enrichment reached, not only of how these providers publish.Generated from the catalog build of 5 October 2026, across 29093 providers, using the same computation served by the APIs.io cohort API. Briefs are published for rosters of 5 or more scored providers; below that a distribution is not meaningful.
Coverage caveat. 290 of 435 scored members had under half their catalog-attributable points satisfied at all (catalog_earned / catalog_max < 0.5). They are INCLUDED in the mean above. A large share here means the cohort mean is partly a measurement of how far our enrichment reached, not only of how these providers publish.Generated from the catalog build of 5 October 2026, across 29093 providers, using the same computation served by the APIs.io cohort API. Briefs are published for rosters of 5 or more scored providers; below that a distribution is not meaningful.
Work with this as data
Every tag here is available over the APIs.io API and to AI agents over MCP.