Visa Trusted Agent Protocol (TAP) vs KYA-OS (Know Your Agent Operating System)
They sit at the same step and overlap in purpose; the fields above are the basis for choosing.
| Visa Trusted Agent Protocol TAP | KYA-OS (Know Your Agent Operating System) KYA-OS | |
|---|---|---|
| Lifecycle step | 2 Identify: Who is this agent? Who is this site? | 2 Identify: Who is this agent? Who is this site? |
| Answers | How does a merchant recognize that an approved commerce agent, rather than a crawler or fraudulent bot, is interacting with its site or API? | How can an MCP server tell which agent is calling, on whose authority it acts, and keep signed proof of what it did? |
| Governed by | Visa (single-vendor specification, published for merchant/developer adoption) | Decentralized Identity Foundation (DIF), KYA-OS Task Force in the Trusted AI Agents Working Group (TAAWG); donated by Vouched; spec editors Dylan Hobbs and the KYA-OS Working Group |
| Status (issuer's words) | Active vendor-led merchant specification | SPEC.md declares 'Version: 1.0.0, Status: Stable' and says it was ratified as a DIF standard; DIF's own posts describe a task force under community development |
| Version | Current merchant specification, 2026, published on Visa Developer | 1.0.0 (Stable, self-declared) |
| Form / transport | HTTP header | document format |
| Found at | /keys | /.well-known/mcp |
| Implementation | prototype — Visa's own launch announcement, naming ecosystem participants including Cloudflare | shipping |
| Evidence | 2 verified, 2 reported | 3 verified, 1 reported |
| Primary use case | Prove an agent's identity | Prove an agent's identity |
| Last verified | 2026-10-23 (current) | 2026-10-23 (current) |
| Specification | https://developer.visa.com/capabilities/trusted-agent-protocol/trusted-agent-protocol-specifications | https://github.com/decentralized-identity/kya-os-mcp/blob/main/SPEC.md |
When to use which
- Choose Visa Trusted Agent Protocol when your question is “How does a merchant recognize that an approved commerce agent, rather than a crawler or fraudulent bot, is interacting with its site or API?” and you accept its maturity: status "Active vendor-led merchant specification", implementation prototype (Visa's own launch announcement, naming ecosystem participants including Cloudflare).
- Choose KYA-OS (Know Your Agent Operating System) when your question is “How can an MCP server tell which agent is calling, on whose authority it acts, and keep signed proof of what it did?” and you accept its maturity: status "SPEC.md declares 'Version: 1.0.0, Status: Stable' and says it was ratified as a DIF standard; DIF's own posts describe a task force under community development", implementation shipping.
Read the full articles
- Visa Trusted Agent Protocol: How does a merchant recognize that an approved commerce agent, rather than a crawler or fraudulent bot, is interacting with its site or API?
- KYA-OS (Know Your Agent Operating System): How can an MCP server tell which agent is calling, on whose authority it acts, and keep signed proof of what it did?