MCP Payment Extensions in June 2026 — x402 v2, L402, and What Actually Works
The agent payment ecosystem is rapidly maturing with the introduction of new protocols and integrations. The x402 protocol has released version 2, featuring updated network identifiers and payment challenge headers, and is now available under the @x402 npm scope. Concurrently, L402, built on Bitcoin's Lightning Network, offers a self-sovereign payment verification method using macaroons and invoices. BoltzPay acts as a bridge, enabling cross-chain conversions for agents that need to operate with different cryptocurrencies. AI
IMPACT Agent payment infrastructure is rapidly developing, enabling agents to pay for APIs, data, and compute, potentially accelerating autonomous agent deployment.