Standards compared 50 head-to-heads
Side-by-side comparisons of agentic web standards that are often confused, often paired, or compete for the same job. Every cell comes from the two records; nothing is editorial.
- Agent2Agent Protocol vs Model Context Protocol Coordinate / Act
- x402 vs Agent Payments Protocol Pay
- x402 vs Machine Payments Protocol Pay
- x402 vs L402 Pay
- Agent Payments Protocol vs Agentic Commerce Protocol Pay
- Universal Commerce Protocol vs Agentic Commerce Protocol Pay
- llms.txt vs AGENTS.md Read
- llms.txt vs Agentic Resource Discovery Read / Discover
- AGENTS.md vs agents.txt Read / Discover
- Agentic Resource Discovery vs api-catalog: A Well-Known URI and Link Relation to Help Discovery of APIs Discover
- Agentic Resource Discovery vs AI Catalog well-known file Discover
- Agent Client Protocol vs Agentic Commerce Protocol Act / Pay
- Agent Client Protocol vs Agent Communication Protocol Act / Coordinate
- Agent2Agent Protocol vs Agent Communication Protocol Coordinate
- Model Context Protocol vs WebMCP Act
- Model Context Protocol vs Agent Client Protocol Act
- A2UI (Agent to UI) Protocol vs Agent-User Interaction Protocol Present
- MCP Apps vs OpenAI Plugins (formerly Apps SDK) Present / Act
- MCP Server Cards (SEP-2127) vs Agentic Resource Discovery Discover
- Web Bot Auth HTTP Message Signatures vs HTTP Message Signatures Identify
- Web Bot Auth HTTP Message Signatures vs SPIFFE (Secure Production Identity Framework for Everyone) Identify
- SPIFFE (Secure Production Identity Framework for Everyone) vs Workload Identity in Multi System Environments (WIMSE) Architecture Identify
- Agent Identity and Discovery vs DNS for AI Discovery Discover
- ERC-8004: Trustless Agents vs Agent Name Service v2 (ANS) Identify
- Agent Identity and Discovery vs Agent2Agent Protocol Discover / Coordinate
- Text and Data Mining Reservation Protocol vs AIPREF Vocabulary Permit
- Really Simple Licensing vs AIPREF Vocabulary Permit
- Content Signals Policy vs AIPREF Vocabulary Permit
- AI Crawler User-Agent Tokens in robots.txt vs agent-permissions.json Permit
- Cloudflare Pay per crawl vs x402 Pay
- OAuth Protected Resource and Authorization Server Metadata (as used for agent authorization) vs auth.md Permit
- Agent Authorization Grant vs Identity Assertion JWT Authorization Grant Permit
- Agent Audit Trail vs AI Agent Execution Profile of SCITT Account
- NLWeb vs Model Context Protocol Act
- agents.json vs Agentic Resource Discovery Act / Discover
- Agent Readability Spec vs llms.txt Read
- Agent Client Protocol vs Agent Connect Protocol (AGNTCY) Act
- Agent Communication Protocol vs Agent Connect Protocol (AGNTCY) Coordinate / Act
- Agent Communication Protocol vs Agentic Commerce Protocol Coordinate / Pay
- Agent Connect Protocol (AGNTCY) vs Agentic Commerce Protocol Act / Pay
- Cloudflare Pay per crawl vs L402 Pay
- Cloudflare Pay per crawl vs Machine Payments Protocol Pay
- Cloudflare Pay per crawl vs s402 Pay
- L402 vs Machine Payments Protocol Pay
- L402 vs s402 Pay
- Machine Payments Protocol vs s402 Pay
- s402 vs x402 Pay
- AIPREF Content-Usage Attachment vs AIPREF Vocabulary Permit
- HTTP Message Signatures vs Signature Agent Card (Web Bot Auth registry) Identify
- Signature Agent Card (Web Bot Auth registry) vs Web Bot Auth HTTP Message Signatures Identify