Agentic Web Protocols

Open ecosystem stack: identity, discovery, messaging, semantic schemas for cross-vendor agent collaboration.

REST-based, language-agnostic protocol for multi-agent collaboration across heterogeneous frameworks.

Decentralized agent discovery + identity for the open agentic web; W3C-style DIDs over HTTP.

Open protocol for AI-agent interoperability — discovery, capabilities, messaging across agent runtimes.

Schema layer for declaring agent capabilities, skills, and policies in a vendor-neutral way.

Reasoning channel exposed via API — adjacent to MCP for richer agent reasoning loops.

OAuth 2.1 + DCR authorization profile for MCP — secure scoped delegation to remote MCP servers.

Open standard for connecting LLMs to tools, data sources, and prompts. Foundation of the modern agent stack.

Standardized agent card location for cross-runtime discovery — paired with /llms.txt + agents.json.

Manifest at /.well-known/agents.json describing an agent's capabilities and endpoints — A2A-compatible.

Plain-text manifest at /llms.txt giving LLMs a concise context map of a website. De-facto standard.

Cryptographically verifiable decentralized identifiers — foundation for agent identity.

Tamper-evident credentials issued by one party and verified by another — used in AP2 + ANP.

Payment authorization layer for autonomous agent commerce; built on top of A2A + verifiable credentials.

EOA → smart-account upgrade; powers programmable agent wallets on Ethereum-compatible L2s.

Authentication + payment over HTTP using Lightning macaroons; widely adopted for paywalled APIs.

Reactivates HTTP 402 'Payment Required' so agents can pay for resources programmatically (USDC on Base).

Generalization of A2A to non-agent endpoints (humans, IoT, oracles).

Agentic Interoperability Transfer Protocol — chat-based message format for agent ↔ agent commerce.

Negotiation-first protocol where agents agree on shared schemas at runtime instead of hard-coded APIs.

On-chain registry of agent reputation, identity, and validation — anti-spam layer for the agentic web.

Natural Language Interaction Protocol — standardized envelope for human-agent and agent-agent dialog.

Micropayments for crowdsourced rate verification — agents and humans tip agents in USDC for proof contributions.

Route money across rails (banks, fintech, crypto) by querying adapters and selecting cheapest path.

Original /.well-known/ai-plugin.json spec — superseded by MCP for tool integrations.