A2A
Business capabilities this tag reaches
Agent Infrastructure & Agentic Commerce 8
Variants seen in the corpus:
Agent to Agent ProtocolAgent-to-AgentAgent2AgentAgent CardA2A
Providers using this tag (453)
Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.
Exemplar 81 Complete, well-documented, and agent-ready
APIs.ioNylasSalesforceCustomer.ioCDataCloudflareRedoclyLeadpingActiveCampaignUpholdRelevance AIMicrosoft Azure API ManagementAtlassianKitXquikBoom AiSMKlogGhostElation HealthDifyOneSignalDrippaylemlistPaubox0xArchiveTabbyXAutomation AnywhereThanxUnifyScope3TextQLCracked APICurlecContext.devDash0Fireflies.aiBrowser UseBlnk FinanceEdge ImpulseProfoundDensifyImmutableVidyardMandateShieldSpeakeasyBirdeyeBindbeeAgoragenticLacunaVirix LabsShieldLabsSpadeThe ColonySignSealShip Partner APIBrand API (Brandfetch)ParallelDelxGivebutterHightouchIntegrationOSPeople Data LabsTaskfolkGemini Trust CompanySendcloudGoogleInstantlyRhombus SystemsAPI EvangelistDeBounceExploriumSyllableiDenfyMolTrustClayPostizInflection.ioRoxyAPISeamless.AISeekrHive Civilization
Strong 104 Solid coverage with minor gaps
Green HelixLive Direct MarketingThe Ainglish ProjectSCVD General StoreBraleGameballPyannoteAIFullEnrichBenchmark EmailGraviteeIBANforgeRefuelFirstPromoterIBMKoalaBooking.comGoogle Cloud PlatformEnv0SendsparkHookLogic (Criteo)Terabase EnergyDant3KonbiniAPIServiceNowBeyond PresenceClosedLoop AIHiltMetriportAbstract APIDeployxaHeronNavatticBuiltWithMagic HourCymeticaSmartleadSpace FrontiersxCuresWhisper SecurityTaskHawk SystemsCelloFeedOracle TechnologiesChronosphereFasten HealthPagesnapCriteoFodda (PSFK)PineconeStructifyAI SquaredMatch It UpInthRevenueBaseEmbossIntegration.app (Membrane)Sift StackGitDealFlowHoneycombForceDream2sClixEmotiveEndgameDynamic FeedLindyApideckLeadpagesSirocogDepotDecartAgent ReadyApstalSendosoAlgoVoiOcientSirenicRelmHumanMirrorMonacoPerfect CorpAirMDRInterfazeMavenlinkSeshat MarketsCustomerOSCopper.coStarbridgeBiconomyClawSpanThe HogBudgetPixelWebCrawlerAPIAntimetalAgentcardFieldPulseTrueFoundryCoin RailzSylvia APIAb180TrustBoost PII SanitizerTypeSafe AIaicomglobalinvinoveritasPixeltable
Developing 129 Usable, with meaningful gaps to close
AgentGatewayAgentCheckPaulieB14SNHPOpplevagentWunderCorpHive Agent IQNefesh AISAPAgent DiscoPictomancer.aiPydanticAIUltravioleta DAOXGuardABBYYGr4vyAgentMeshMERCURYbrick.blueSeam AIOrthogonalConfido Legaliwant.fyiOptionsAhoyNovita AIEqualsReevomakeup.landRazorpaybroke2builtAgentic AI FoundationAutomation Preflight APIBrunoememSarj AI Developer APIToAPIsAGNTCYNumbers OnlineVaultfire ProtocolBlock LottosLokkiLVL LTD COgpt55-token-gatewaySandboxAQAtomadic TechKardinalMacaroon NetworkPostalFormMove Home Organisation CICTARXANanchor-x402CONNSKILLNeuralVerge APItemp.mdAfriexDigital AssetHilosCaretta01MindAgentsPodiumPlyriumAPIMeshDecision AnchorKineticaPermutiveSolvelaHostDeFiRockerboxHORIZON SHIELDanewCape PartnersCouncil of AITavilyCanFlyNeuronto ARD RegistryClaixAngelListingest0rSegmentStreamMarz Greta-Lock NetworkVerified Digital Agents (VDA)Agent Health MonitorCybleMoirai LabsSSSNACKClawdChat 虾聊Agent ExchangeChainAware.aiAI Crawler IndexSuperDialInfinite AudienceSchemaSureLangChainMUJ428Microsoft Azure AI FoundryANP2Luther SystemsPOLICYANDPLAY LTDPhos LabsCrewAI Cloudmicro1ViewsMeetWagerXKann KI das? Sponsoring AgentCharitySenseAmbrHergert SynthoraFinn-tannlegeAvalixAGENTUMBerrerTofuPoolPartyAgent ZeroBMC XIVRett fra BondenLiquid AgentPolycodeNameWhisperOpenSeaPiknik.SpotPolicyCheckKimetsuPrivateDAOWarpPay402 StudioMachine RealmsEnfuceAgMsgSuperscale
Thin 71 Limited public surface area
A2A402A2AParkX402 AI 自助门店Artem / A2A Sandboxopenclaw / evm-labAgentDMagent402.dev昆仑瑶池 (Kunlun Yaochi)11xRequestyRS PerformanceLangSmithDirect HireGONNAGRITHAppliedAI (AAICO)AVORA Agent ForgeAgentWorldFinite StateMerchant-0The Culture CommonsKG-NINJAallagentsCo-LegalKong AI GatewayTESSA Marketing & TechnologyRenooLabRosenticAIScanQoreviaChado StudioFutureverseTeamwork.comAgent Failure Mode RegistryPhi LongevityQuickNodeSunny YuenIntentGuardAUX by PrdictionEdgeliars.townMonday.comScro Orphan DeskHeliusBuyWhereScrapflyDELTA Witness — Trust Layer for Autonomous ActionsLuminary LaneSalesgraphWikiKVgaipagents-comWRONG BEAUTY 000 / THE SWARMInworld AIMycelnetARAKEL Machine Evidence NetworkDEUSPROOFGogsVelvtPrimitiveGenie-us SoftwarewhitecloverChilledSitesEventEdge OracleSINCORTravel WorldAnloraUrantia PapersArt BlocksModel Context Protocol (MCP)ForterAgentic Resource Discovery (ARD)Meow
Emerging 41 Early or largely undocumented
Kaxo TechnologiesPriorflowsapjilcodingdigiantnzVerse (autonomous agent)ANOTSWilliamOPC / 彼岸花开HaneruToGlifReDocSursaTechScalpStreamSageoxIRIZ PlatformPerkoonKOA LabsAfterQueryGrok & MonWib&Wob (symbients)AI City Social TownAttioHealth Universe1inchClearhousep0stmanR.E. Merrill & AssociatesGensparkStack AuthStreamkapJake GaylorElderly Care MatchFastMCPStacklokAgent BenchTanoMoney You're OwedSavvlyCrest Deployment Systems LLCRelaySymbiotic
Minimal 27 Almost no public developer surface
APIs with this tag (251)
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 11 Complete, well-documented, and agent-ready
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,...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...Agoragentic A2A AgentAgent2Agent protocol surface: a conformant agent card served from https://agoragentic.com/.well-known/agent...Lacuna A2A AgentAgent-to-Agent JSON-RPC endpoint at https://www.lacuna.fm/a2a advertising the "Lacuna Music" agent card at ...Human Browser A2A AgentAgent2Agent protocol surface: an agent card (protocolVersion 0.3.0, JSONRPC, version 5.1.0) served byte-ide...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...MolTrust A2a APIThe A2a API from MolTrust — 2 operation(s) for a2a.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.
Strong 38 Solid coverage with minor gaps
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.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...Dant3 Discovery Agent (A2A)A2A 1.0 agent (JSON-RPC binding) that returns machine-readable entry points for the Dant3 network, machine ...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...Cuvo Health A2a APIAgent2Agent JSON-RPC endpointMachine Library A2A AgentA2A (protocolVersion 0.3.0) research and commerce agent at https://machinelibrary.ai/a2a over JSON-RPC: gro...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.OracleNet A2A AgentA2A 0.3 JSON-RPC agent at https://tooloracle.io/a2a/jsonrpc (message/send, tasks/*, push-notification confi...Fodda Research Agent (A2A)Agent-to-Agent endpoint at mcp.fodda.ai/a2a (JSONRPC, A2A protocolVersion 0.3.0) discovered from https://ww...Match It Up NetworkBot A2A AgentAgent-to-Agent surface for the NetworkBot — an A2A agent card at https://matchitup.in/.well-known/agent-car...Emboss A2A AgentAgent2Agent interface at https://api.getemboss.ai/a2a (JSON-RPC, A2A 1.0) discovered through a signed agent...GitDealFlow A2A AgentAgent-to-Agent (A2A 0.3.0) JSON-RPC 2.0 endpoint implementing message/send, tasks/get and tasks/cancel over...ForceDream A2A AgentAgent2Agent (A2A) protocol surface: a signed (ES256 JWS, kid in /.well-known/jwks.json) agent card served f...2s A2A AgentAgent2Agent (A2A) protocol surface: an agent card served from https://2s.io/.well-known/agent-card.json (pr...Clix A2A AgentAgent2Agent (A2A) protocol surface: a public agent card at https://api.clix.so/.well-known/agent-card.json ...Dynamic Feed A2A AgentA2A 1.0 JSON-RPC agent at https://dynamicfeed.ai/a2a with a JWS-signed agent card (graded conformant) decla...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.Agent Ready A2A AgentAgent2Agent (A2A) surface: a signed agent card served from https://agent-ready.dev/.well-known/agent-card.j...AlgoVoi A2a APIThe A2a API from AlgoVoi — 12 operation(s) for a2a.Sirenic A2A AgentAgent2Agent JSON-RPC endpoint exposing the 116 paid routes as A2A skills (skill ids are the OpenAPI path te...Corti Agentic Framework APIBuild and orchestrate healthcare agents over the A2A protocol with prebuilt medical experts and MCP tool in...Relm A2A AgentAgent2Agent (A2A 0.3.0) JSON-RPC endpoint at https://api.relmcrm.com/a2a. A message/send whose data part is...HumanMirror Machine APIMachine API for autonomous-agent safety, deterministic execution receipts, payment compatibility, and x402 ...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.IAB Tech Lab A2a APIThe A2a API from IAB Tech Lab — 1 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...WebCrawlerAPI Agent CardA2A-style agent card served from https://webcrawlerapi.com/.well-known/agent-card.json describing "WebCrawl...TrustBoost A2A AgentAgent2Agent surface: an agent card served from https://api.trustboost.dev/.well-known/agent-card.json (vers...aicomglobal A2A AgentAgent2Agent (A2A) protocol surface: an agent card served from https://aicomglobal.com/.well-known/agent-car...invinoveritas A2A AgentA2A agent "invinoveritas-reasoning-agent" (protocolVersion 0.3.0, JSONRPC transport) at https://api.babyblu...
Developing 102 Usable, with meaningful gaps to close
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...Pictomancer.ai A2A AgentAgent-to-Agent endpoint at https://api.pictomancer.ai/a2a (JSON-RPC) described by a published 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.XGuard A2A AgentAgent2Agent surface: an agent card served identically from https://api.xguardgate.com/.well-known/agent-car...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...MERCURY Web Fetch A2A AgentAgent-to-Agent (A2A 0.3.0) surface for "MERCURY Web Fetch", published as a conformant agent card at https:/...brick.blue A2A agentJSON-RPC A2A door at https://brick.blue/a2a, advertised by a JWS-signed agent card at /.well-known/agent-ca...iwant.fyi A2A AgentAgent-to-Agent endpoint at https://iwant.fyi/api/a2a (JSON-RPC message/send and tasks/get) that needs no ke...Meta Agent Tools A2a APIThe A2a API from Meta Agent Tools — 5 operation(s) for a2a.AgentGatewayAgentGateway provides AI-native gateway capabilities for routing LLM traffic, federating MCP tools, enablin...OptionsAhoy Equity Planner (A2A Agent)Agent2Agent (A2A) protocol surface: an agent card served from https://optionsahoy.com/.well-known/agent-car...Agent2Agent (A2A)Agent2Agent (A2A) is an open protocol that lets AI agents built by different organisations, on different fr...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.Numbers Online A2A AgentAn Agent-to-Agent (A2A protocolVersion 0.3.0, JSONRPC) endpoint at POST https://numbers.online/api/v1/a2a e...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....GPT55 Model Gateway A2A AgentAgent2Agent surface: an agent card served at https://gpt55.558686.xyz/.well-known/agent-card.json (and iden...huggingbay-xyz A2a APIThe A2a API from huggingbay-xyz — 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.PostalForm A2A AgentAgent2Agent (A2A) surface: an agent card served from https://postalform.com/.well-known/agent-card.json (pr...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...CONNSKILL Growth Services A2A AgentA2A merchant agent (protocolVersion 0.3.0, JSON-RPC at agent.connskill.com/a2a) whose card at /.well-known/...temp.md A2A Publisher AgentA2A 1.0 agent ("temp.md Publisher") reachable over JSON-RPC at https://api.temp.md/a2a with three skills - ...01Mind A2A AgentAgent2Agent (A2A) protocol surface: an agent card served from https://01mind.net/.well-known/agent-card.jso...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.Decision Anchor A2A AgentAgent2Agent protocol surface: a signed agent card (protocolVersion 1.0, JSONRPC, version 1.3.42, Ed25519 JW...Blazing Bullet Private Limited A2a APIThe a2a API from Blazing Bullet Private Limited — 5 operation(s) for a2a.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....anew A2a APIAgent2Agent (A2A) protocol JSON-RPC endpoint.Cape Partners Agent Exchange (A2A)The A2A 1.0 surface of the Cape Partners agent exchange: SendMessage, GetTask and ListTasks on both the JSO...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...CanFly.ai Hosted Agent Cards (A2A)Per-agent A2A-shaped agent cards served from the platform host for every public marketplace agent at https:...Claix A2A AgentNative Agent-to-Agent (A2A 0.3) JSON-RPC agent at /a2a with a public agent card at /.well-known/agent-card....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...VDA Onboarding AgentAdmission authority for the suite — an A2A agent (6 skills) that runs holder-binding (DID-auth), intake and...Moirai Agents API (A2A + MCP)A2A 1.0 agent ("A2A-compatible analytics and contract intelligence agent", version 0.1.0) with 11 skills — ...SSSNACK A2A AgentAgent2Agent protocol surface: an A2A 1.0 agent card served with media type application/a2a+json at https://...ClawdChat 虾聊 A2a APIThe a2a API from ClawdChat 虾聊 — 16 operation(s) for a2a.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...The Agent Exchange Clearing HouseThe agent-to-agent task market at https://exchange.agentexchange.work: agents register a free reputation pa...Infinite Audience A2A APIAgent-to-Agent task protocolMUJ428 Trust Reflex A2A AgentAgent2Agent surface: an agent card served from https://agents.muj428.com/.well-known/agent-card.json (name ...AgentSearch A2A AgentAgent2Agent surface for AgentSearch — an agent card at https://agentsearch.luthersystems.com/.well-known/ag...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.InsideOut A2A AgentAgent2Agent surface for InsideOut — an agent card at https://insideout.luthersystems.com/.well-known/agent-...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...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.Phos Labs MCP ServerHosted, remote Model Context Protocol server. POST https://mcp.phoslabs.io/mcp is Streamable HTTP behind OA...ViewsMeet Participation A2A AgentA2A v1.0 agent (JSON-RPC binding at https://viewsmeet.com/api/agent/a2a) with one skill, curated-either-or-...1F916 A2a APIThe A2a API from 1F916 — 1 operation(s) for a2a.University of Amsterdam A2a APIThe a2a API from University of Amsterdam — 5 operation(s) for a2a.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...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...Ambr A2A AgentAgent-to-Agent JSON-RPC endpoint at https://getamber.dev/api/a2a implementing message/send, tasks/get and t...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.ai-akari-ai A2A APIAgent-to-Agent protocol surface.Autonoma A2A AgentAgent2Agent (A2A) protocol surface: an agent card served from https://avalix.ai/.well-known/agent-card.json...AGENTUM Business A2A AgentAgent2Agent (A2A) protocol surface of AGENTUM Business: an agent card at https://business.agentum.lat/.well...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...API7.ai A2A APIThe A2A API from API7.ai — 2 operation(s) for a2a.PoolParty Agent Concierge (A2A)Agent2Agent surface: an A2A 0.3.0 agent card served at https://www.poolparty.io/.well-known/agent-card.json...Agent Zero A2A AgentAgent2Agent surface: an agent card served from https://onchainagentintel.io/.well-known/agent-card.json (mi...Beste KI Tools A2a APIThe A2a API from Beste KI Tools — 1 operation(s) for a2a.Opplevagent 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.a2awire-com A2a APIThe a2a API from a2awire-com — 5 operation(s) for a2a.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...AgenTrux A2a APIThe a2a API from AgenTrux — 1 operation(s) for a2a.Attrove A2A APIThe A2A API from Attrove — 4 operation(s) for a2a.marginalia A2A AgentAgent2Agent (A2A) surface for marginalia: an agent card served from https://marginalia.polycode.co.uk/.well...Agno A2A APIThe A2A API from Agno — 15 operation(s) for a2a.AI Alt Finder A2a APIThe A2a API from AI Alt Finder — 1 operation(s) for a2a.Name Whisper A2A AgentThe agent-to-agent surface: an anonymous A2A 0.3.0 JSON-RPC endpoint at https://namewhisper.ai/a2a whose ag...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.PolicyCheck A2A AgentJSON-RPC 2.0 Agent-to-Agent endpoint at https://policycheck.tools/api/a2a, discovered through an A2A agent ...Aurelius Agent A2A APIAgent-to-Agent (A2A 0.3.0) JSON-RPC surface for Aurelius Agent, WunderCorp's strategic planning and orchest...Archestra AI A2A APIThe A2A API from Archestra AI — 5 operation(s) for a2a.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...AIMEAT A2A APIThe A2A API from AIMEAT — 2 operation(s) for a2a.Machine Realms A2A AgentAgent2Agent 1.0 surface: an agent card at https://machinerealms.com/.well-known/agent-card.json (version ne...EcoAloha A2a APIThe A2a API from EcoAloha — 1 operation(s) for a2a.seiche-info A2a APIThe A2a API from seiche-info — 5 operation(s) for a2a.
Thin 62 Limited public surface area
Alternativas IA A2a APIThe A2a API from Alternativas IA — 1 operation(s) for a2a.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...RS Performance A2A AgentPublic A2A agent for automotive intents — OBD DTC lookup, vehicle diagnostics, repair services, EV/hybrid a...Bernstein A2a APIThe A2a API from Bernstein — 14 operation(s) for a2a.Direct Hire A2A Meta-AgentDirect Hire's A2A v1.0 discovery agent, published at /.well-known/agent-card.json with a JSON-RPC interface...LEGIT A2A Agent CardAgent card served from https://legit.gonna.bond/.well-known/agent.json and, byte-identical, from the canoni...GRITH Gate A2A AgentThe A2A 1.0 JSON-RPC bridge at https://grithgate.com/api/a2a (also on grithland.com and grithhold.com), des...A2A402 Agent Work Router (A2A)The Agent2Agent JSON-RPC 2.0 endpoint declared by the agent card: message/send returns a stateless A2A Mess...AgentWorld Concierge (A2A)Anonymous A2A 1.0 discovery concierge. Its agent card at /.well-known/agent-card.json declares four skills ...Finite State A2A Content APIPublic, anonymous, read-only JSON-RPC 2.0 API exposing Finite State's published content: blog posts, resour...Merchant-0 A2A AgentAgent2Agent (A2A) surface: an agent card served from https://merchant-0.com/.well-known/agent-card.json (wi...jarvisclaw-ai A2a APIThe A2a API from jarvisclaw-ai — 1 operation(s) for a2a.The Culture Commons A2A AgentAgent2Agent (A2A) surface: an agent card served from https://culture.sbs/.well-known/agent-card.json (proto...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 preparationallagents 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...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...Kong Agent GatewayKong Agent Gateway is a capability of Kong AI Gateway (GA April 2026 with AI Gateway 3.14) that governs age...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.RenooLab A2A AgentRead-only Agent2Agent surface: an A2A 1.0 JSON-RPC endpoint at https://a2a.renoolab.fr/a2a whose card (serv...Rosentic A2A AgentAgent2Agent protocol surface: an agent card served from https://api.rosentic.com/.well-known/agent-card.jso...AIScan A2A AgentAgent2Agent (A2A) protocol surface: an agent card served from https://getaiscan.app/.well-known/agent-card....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://...BrainstormRouter A2a APIThe a2a API from BrainstormRouter — 2 operation(s) for a2a.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...Agent Failure Mode Registry A2a APIThe A2a API from Agent Failure Mode Registry — 1 operation(s) for a2a.Phi Longevity PRISM A2A AgentA2A 1.0 agent (JSON-RPC at https://philongevity.com/a2a) with one skill — chronic-disease records consolida...Keycard APIKeycard API as documented publicly: 15 operations. Contract generated from the documentation by API Evangel...LiteLLM A2A Agent Gateway APIProvides /a2a endpoints for the Agent-to-Agent (A2A) gateway, enabling agent registration, publishing, and ...AUX A2A Agent (JSON-RPC)A2A 1.0 JSON-RPC interface for the AUX Evidence and Certification agent, exposing twelve bounded skills (bu...A2APark A2A AgentThe Park's agent-to-agent surface: an anonymous A2A 0.3.0 JSON-RPC endpoint whose single method, message/se...logicnodes-io A2a APIThe A2a API from logicnodes-io — 1 operation(s) for a2a.liars.town A2A AgentAgent-to-Agent endpoint at https://liars.town/a2a (JSON-RPC 2.0, message/send) declared by the agent card s...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 ...Agentifizierung A2a APIThe A2a API from Agentifizierung — 3 operation(s) for a2a.WikiKV A2A AgentAgent-to-Agent endpoint (JSON-RPC and HTTP+JSON bindings at /a2a, interface protocolVersion 1.0) exposing o...Attested Memory A2a APIThe a2a API from Attested Memory — 2 operation(s) for a2a.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.Artem / A2A Sandbox A2a APIThe A2a API from Artem / A2A Sandbox — 1 operation(s) for a2a.Sandbox Contractor Agent (A2A)Agent2Agent protocol surface: an agent card served from https://a2a.elonsusk.com/.well-known/agent-card.jso...Physical Capability Cloud A2a APIThe A2a API from Physical Capability Cloud — 4 operation(s) for a2a.THE SWARM A2A AgentAgent2Agent discovery surface: an A2A 0.3.0 agent card served at https://swarm-api.wrongbeauty.com/.well-kn...samedaydesk-com A2A APIThe A2A API from samedaydesk-com — 3 operation(s) for a2a.Mycelnet A2A AgentMycelnet's agent-to-agent surface: an anonymous A2A 0.3.0 JSON-RPC endpoint at https://mycelnet.ai/a2a desc...DEUSPROOF A2A AgentAgent2Agent surface: a signed (JWS EdDSA, kid = the register's did:key) A2A 1.0 agent card at https://deusp...Velvt A2A AgentVelvt's Agent2Agent door — an anonymous JSON-RPC 2.0 message/send endpoint at https://www.velvt.ai/api/a2a ...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.Duffer Golf A2a APIThe A2a API from Duffer Golf — 1 operation(s) for a2a.SINCOR 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...Travel World A2A AgentAgent-to-Agent surface declared by the A2A 1.0 agent card at https://travel.augworlds.ai/.well-known/agent-...onchain-risk-oracle A2A AgentAgent2Agent (A2A) protocol surface: an agent card at https://oracle.evebrief.org/.well-known/agent-card.jso...DefaultBench A2A APIA2A 1.0 HTTP+JSON binding.SwarmDM A2a APIThe a2a API from SwarmDM — 8 operation(s) for a2a.AgentDM APIAgentDM API as documented publicly: 5 operations. Contract generated from the documentation by API Evangeli...AINumbers.co A2A APIThe A2A API from AINumbers.co — 5 operation(s) for a2a.dnsofmoney-com A2a APIThe a2a API from dnsofmoney-com — 3 operation(s) for a2a.Agorean APIAgorean API as documented publicly: 9 operations. Contract generated from the documentation by API Evangeli...
Emerging 35 Early or largely undocumented
b612 A2A AgentAgent2Agent (A2A) protocol surface: an agent card served from https://mcp.hakuto-0209.com/.well-known/agent...FleetHelp Support Agent (A2A)Agent2Agent (A2A) surface: an agent card served from https://fleethelp.ai/.well-known/agent.json (protocolV...Priorflow Intelligent Agent/Service Selector APIOne operation: POST /v1/select with JSON {query, top_n?, constraints?, weights?, caller_agent?} returns ord...SursaTech AI Advisor A2A APIAn A2A 1.0 agent (JSON-RPC 2.0 over HTTP POST, streaming declared) exposing ten skills: get_company_profile...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...California Bitcoin A2a APIThe A2a API from California Bitcoin — 1 operation(s) for a2a.IRIZ Platform A2A Interop AgentA2A agent card ("IRIZ Platform Agent", version 1.0.0, protocolVersions ["0.3","A2A-1.4"]) served at the leg...ChainRay Agent Card APIThe Agent Card API from ChainRay — 3 operation(s) for agent card.P0 Agent Economy Index A2a APIThe A2a API from P0 Agent Economy Index — 1 operation(s) for a2a.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 /...Casdoor MCP GatewayCasdoor's MCP (Model Context Protocol) gateway and A2A (Agent-to-Agent) protocol surface, designed to broke...GanjaMon AI A2A AgentAgent2Agent (A2A) protocol surface: an agent card served from https://grokandmon.com/.well-known/agent-card...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...AI City Social Town A2A APISingle JSON-RPC 2.0 endpoint (POST https://aicity.jiademin2688.top/a2a) through which external agents join ...艾赋 AIFU A2a APIThe a2a API from 艾赋 AIFU — 4 operation(s) for a2a.Zero A2A Agentp0stman's agent-to-agent surface: an A2A agent card for "Zero" served at /.well-known/agent-card.json (and ...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...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...Verse A2A AgentAgent2Agent surface declared by the card at https://api.verse-me.com/.well-known/agent.json (version 2.0.0,...Agent Traffic Lab A2a APIThe A2a API from Agent Traffic Lab — 1 operation(s) for a2a.Jake Gaylor A2A AgentA2A agent representing Jake Gaylor, discovered at /.well-known/agent-card.json on ai.jakegaylor.com (and as...Elderly Care Match A2A AgentAgent2Agent (A2A 1.0) surface: an agent card at https://www.elderlycarematch.com/.well-known/agent-card.jso...Agent Bench Travel MerchantSeller agent for flight search and travel checkout, exposed on one host through two protocol doors: A2A JSO...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...AgentBazaar APIAgentBazaar API as documented publicly: 16 operations. Contract generated from the documentation by API Eva...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 ...AgentLot APIAgentLot API as documented publicly: 6 operations. Contract generated from the documentation by API Evangel...
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 (49)
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
a2awire-com
Agent Traffic Lab
AgentBazaar
Agentifizierung
AgentLot
AgenTrux
Agno
Agorean
AI Alt Finder
ai-akari-ai
AIMEAT
AINumbers.co
Airia
Alternativas IA
API7.ai
APIClaw
Archestra AI
Attested Memory
Attrove
Bernstein
Beste KI Tools
Blazing Bullet Private Limited
BrainstormRouter
California Bitcoin
CarGene
Casdoor
ChainRay
Corti
Cuvo Health
DefaultBench
dnsofmoney-com
Duffer Golf
EcoAloha
huggingbay-xyz
IAB Tech Lab
jarvisclaw-ai
Keycard
Kong
LiteLLM
logicnodes-io
Meta Agent Tools
P0 Agent Economy Index
Physical Capability Cloud
samedaydesk-com
seiche-info
SwarmDM
University of Amsterdam
艾赋 AIFU
Score breakdown
Frequency
74.7
log-scaled weighted occurrences
Breadth
6.6
spread across providers
Quality lift
57.7
mean composite of providers using it
Cohesion
14.5
strength of nearest seed neighbor
Where this tag sits
453 providers carry this tag directly, and 456 counting the 1 narrower tag below — 3 more to reach.
Related tags
A2A Verified 337 co-occurrences
x402 111 co-occurrences
Agent-Native 161 co-occurrences
Agents 207 co-occurrences
MCP 309 co-occurrences
AI Agents 151 co-occurrences
Agentic Commerce 60 co-occurrences
Where this tag comes from
Provider tag453
Api tag248
Openapi tag83
Openapi op tag262
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% |
| x402 Micropayments & Agentic Pay-per-Call | 52% |
| Typed Decision Models | 27% |
| Commerce and CRM | 24% |
Cohort brief
Auto-generatedThe 439 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
439
of 453 in the catalog
Mean Kin Score
49.4
+26.6 vs catalog 22.8
Mean Agent Readiness
40.5
+27.2 vs catalog 13.3
Spread
1.8–95.4
median 51.7 · σ 18.4
How the 439 split by band
Exemplar 81Strong 104Developing 129Thin 69Emerging 39Minimal 17
Facet averages, against the whole catalog
| Facet | This cohort | Catalog | Difference | Scored |
|---|---|---|---|---|
| Developer Ergonomics | 52 | 22.1 | +29.9 | 439 |
| Contract Quality | 44.9 | 18.2 | +26.7 | 439 |
| Access Clarity | 51.2 | 25 | +26.2 | 439 |
| Operational Transparency | 38 | 12.4 | +25.6 | 439 |
| Contract Governance | 26.2 | 9.4 | +16.8 | 439 |
| Discoverability | 72.5 | 57.9 | +14.6 | 439 |
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) | 82% | 16% | +66 |
| MCP server (first-party) | 80% | 14% | +66 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 32% | 13% | +19 |
| Security | 100% | 98% | +2 |
| Arazzo workflows | 4% | 2% | +2 |
| Governance rules | 80% | 35% | +45 |
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 APIs.io 95.4
- 2 Nylas 92.6
- 3 Salesforce 90.6
- 4 Customer.io 86.9
- 5 CData 83.8
- 6 Cloudflare 82.8
- 7 Redocly 82.7
- 8 Leadping 82.1
- 9 ActiveCampaign 82
- 10 Uphold 81.6
Top by Agent Readiness
- 1 Xquik 91.8
- 2 APIs.io 79.5
- 3 Sirenic 75.6
- 4 Emboss 75.2
- 5 Agent Ready 74.4
- 6 ClosedLoop AI 73.8
- 7 Primitive 73.2
- 8 Cymetica 73
- 9 Agentcard 72.3
- 10 Leadping 71.7
All 453 members of this roster resolve to a provider in the
catalog; 439 carry a score (97%).
The figures above describe the scored members only.
Coverage caveat. 227 of 439 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 7 November 2026, across 38912 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. 227 of 439 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 7 November 2026, across 38912 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.