Cross Domain · specification · Agentic AI Foundation
Agent2Agent
The Agent2Agent (A2A) Protocol is an open standard for communication and interoperability among independent—often opaque—AI agent systems. Because agents may be built with different frameworks, languages, and vendors, A2A provides a common language and interaction model.
a2a-protocol.org/latest/The standard
Agentic AI FoundationGoverning body · Linux Foundation
v1.0.1 (28 May 2026)Current version
1306measured implementing it
453tagged with it
Also known as A2A.
Measured implementing Agent2Agent 1306
These providers were observed, not self-declared: they serve an A2A Agent Card at /.well-known/agent-card.json, graded against A2A 1.0. Read from each provider's Kin Score agent-readiness grade. The top 300 of 1306 are shown; the full section lists them all.
conformant · 838near-conformant · 113flavored · 355
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Providers that carry Agent2Agent 453
These providers' own APIs.json profiles carry Agent2Agent as a tag — the provider's statement that the standard is part of what it does. APIs.io has not verified the implementation on this page; the de facto profiles on this site are where that measurement exists. Ordered by Kin Score; the top 60 of 453 are shown, and the tag page lists them all.
APIs.ioexemplar · 95.4Nylasexemplar · 92.6Salesforceexemplar · 90.6Customer.ioexemplar · 86.9CDataexemplar · 83.8Cloudflareexemplar · 82.8Redoclyexemplar · 82.7Leadpingexemplar · 82.1ActiveCampaignexemplar · 82.0Upholdexemplar · 81.6Relevance AIexemplar · 81.4Microsoft Azure API Managementexemplar · 80.3Atlassianexemplar · 79.9Kitexemplar · 79.6Xquikexemplar · 79.6Boom Aiexemplar · 79.5SMKlogexemplar · 79.5Ghostexemplar · 79.4Elation Healthexemplar · 79.3Difyexemplar · 78.4OneSignalexemplar · 78.0Drippayexemplar · 76.8lemlistexemplar · 76.0Pauboxexemplar · 75.80xArchiveexemplar · 75.7Tabbyexemplar · 75.6Xexemplar · 74.7Automation Anywhereexemplar · 74.6Thanxexemplar · 74.4Unifyexemplar · 74.3Scope3exemplar · 73.8TextQLexemplar · 73.3Cracked APIexemplar · 73.1Curlecexemplar · 73.1Context.devexemplar · 72.9Dash0exemplar · 72.9Fireflies.aiexemplar · 72.7Browser Useexemplar · 72.5Blnk Financeexemplar · 71.7Edge Impulseexemplar · 71.5Profoundexemplar · 71.3Densifyexemplar · 71.2Immutableexemplar · 71.1Vidyardexemplar · 71.1MandateShieldexemplar · 70.7Speakeasyexemplar · 70.7Birdeyeexemplar · 70.5Bindbeeexemplar · 70.4Agoragenticexemplar · 70.1Lacunaexemplar · 70.0Virix Labsexemplar · 69.9ShieldLabsexemplar · 69.8Spadeexemplar · 69.8The Colonyexemplar · 69.8SignSealShip Partner APIexemplar · 69.7Brand API (Brandfetch)exemplar · 69.6Parallelexemplar · 69.5Delxexemplar · 69.4Givebutterexemplar · 69.4Hightouchexemplar · 69.4
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Read from the API Evangelist standards directory, facts verified 2026-11-05. Provider links come from the catalog's own identity tags and are rebuilt nightly. If this page is wrong about a standard or a provider, say so.