Proof x401
Open HTTP protocol and MCP server that let a website ask an AI agent to prove who it is acting for and have the person cryptographically sign the exact transaction terms, using Proof's agent identity wallet.
Updated
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Use cases
About Proof x401
Proof x401 is listed in our crypto category and is aimed at builders. Open HTTP protocol and MCP server that let a website ask an AI agent to prove who it is acting for and have the person cryptographically sign the exact transaction terms, using Proof's agent identity wallet. Pricing, as the maker states it: Open protocol; websites can pay per verified identity claim over x402, basic claims need no sales process. Maturity: Live; production launch Oct 15, 2026. We last checked the official link on 2026-10-16.
What is Proof x401?
x401, from Proof, is an identity protocol for agentic commerce that gives AI agents a way to prove what they're authorized to do.
Our listing notes it is an open HTTP protocol plus MCP server, with websites paying per verified identity claim over x402.
Sources: the official site and our directory listing, checked 2026-10-18. Official site: proof.com/x401.
Who is Proof x401 for?
Websites and agent builders needing verified identity.
Key features
- Agent identity protocol
- Authorization proofs
- MCP server
Proof x401 FAQ
What is Proof x401?
x401, from Proof, is an identity protocol for agentic commerce that gives AI agents a way to prove what they're authorized to do.
Who is Proof x401 for?
Websites and agent builders needing verified identity.
Is Proof x401 free?
Proof x401's pricing, as the maker states it: Open protocol; websites can pay per verified identity claim over x402, basic claims need no sales process. Check the official site for current plans.
What are alternatives to Proof x401?
Similar tools include EVM MCP Server, Alchemy MCP Server, BICScan MCP, Chainstack MCP, OpenZeppelin MCP and Pyth Pro MCP.
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🧭 Task guides: Agent payment tools for crypto agents · Agent wallet tools for crypto agents
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