A2A alternatives in 2026: 19 tools like A2A

Closest: Agent Communication Protocols

ACP

Agent Communication Protocol by IBM/BeeAI

Curated

0 use thisCompare with A2A
Agentic Commerce Protocol

Open standard by Stripe and OpenAI for agent-driven checkout flows

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AGENTS.md

Open convention for giving coding agents build, test, and style instructions

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ANP

Agent Network Protocol for decentralized agent communication

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AP2

Google Cloud's open-source Agent Payments Protocol for AI agent transactions

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Trusted Agent Protocol

Visa specification letting merchants verify trusted AI shopping agents

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More in AI Protocols

MCP

Model Context Protocol by Anthropic for tool and data access

Curated

1 use thisCompare with A2A
Arcade

Runtime for authorizing, executing, and governing AI agent tool calls

Curated

0 use thisCompare with A2A
Composio

Managed toolset and integrations platform for AI agents via MCP

CuratedWeb

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Glama

Directory and gateway for MCP servers

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Merge Agent Handler

Merge platform connecting AI agents to third-party tools over MCP

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Nango

Integration platform connecting products and AI agents to external APIs

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Smithery

Registry for discovering and deploying MCP servers

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Nevermined

Payments infrastructure for AI agents to meter usage and settle charges

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Stripe Agentic Commerce Suite

Stripe suite for accepting agentic payments and selling via AI agents

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EM

Excel MCP Server

MCP server for reading and editing Excel files without Excel installed

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S

Skyfire

Identity and payment tooling for AI agents to log in and check out

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VI

Visa Intelligent Commerce

Visa program enabling AI agents to make card payments for consumers

Curated

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Novamira

Open-source WordPress plugin that exposes a site to AI agents over MCP

CommunityWeb

0 use thisCompare with A2A

Questions

What are the closest alternatives to A2A?

ACP, Agentic Commerce Protocol and AGENTS.md sit on the same sub-line as A2A (Agent Communication Protocols) on AI Landscape, with 3 more.

How are these alternatives chosen?

They are the other products on the AI Protocols stop of the map: curated products first, the ones on A2A's sub-line before the rest, then by name until members have marked enough of them.