Agent trust and registries: 4 companies ranked

Companies selling directories, registries and trust scores for AI agents and the businesses behind them, in SalesBook agentic-sector rank order. Every company has a profile with dated public sources and a live check of its agent interfaces (MCP, llms.txt). Ranks use the published SalesBook method; tell us who is missing.

• INAM Protocol#116Reputation registry for AI agents and x402 sellers, with two-party signed execution receipts and a pass/caution/fail check.
  MCP connector: yesllms.txt: yes
• allagents#124Directory of AI agents and MCP servers that tests listings itself; listing is free and done by API.
  MCP connector: yesllms.txt: yes
• Agentery#125Free discovery and price-tracking service for AI agents, MCP servers and APIs, with signed records available to agents.
  MCP connector: yesllms.txt: yes
• Nordax AI#126Entity trust infrastructure: cryptographically verified business profiles and trust scores that AI systems can query.
  MCP connector: yesllms.txt: yes