x402 has a brilliant mechanic — it spreads like a good virus every agent can now discover each other and quickly pay every other agent via x402 - Agent A discovers Agent B (via MCP bazaar/directory) - Agent A sends normal HTTP → Agent B replies HTTP 402 Payment Required + price quote for the task - Agent A auto-pays via facilitator (Coinbase/Virtuals), signs, and settles in <1s - Agent B returns the result + its own MCP payment rail - Agent A automatically installs B’s rail → A can forward B’s payment capability When Agent A hires Agent Z, it passes on B's rail + help seeds Z wallet. Agent Z is now able to discover, hire, and pay Agent B (and the loop continues). Result: One agent learns a new MCP skill/tool/rail → it instantly propagates to every connected agent, creating Self-propagating adoption. (h/t @MurrLincoln for the good virus analogy)