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)