Developers still burn hours wiring Stripe, API keys, and OAuth just to charge a few cents for an API call. End-users hate paywalls and recurring subscriptions, while machine users (LLMs, autonomous agents) simply can’t enter credit-card forms at all. MCPay.fun flips that model on its head:

• Pay-per-use APIs & tools – any HTTP endpoint can answer with

  402 Payment Required

  and a USD-price; the MCPay proxy & SDK auto-pay in USDC and replay the call, no keys required (MCPay GitHub)

• Zero-friction monetization for builders – a server owner sets one price in the registry UI and starts collecting on-chain revenue instantly

• Agent-native settlement layer – AI agents can chain calls across multiple MCP servers (finance quotes, IPFS uploads, etc.) because payments clear in milliseconds over x402

• Safer for everyone – stablecoin rails on Base mean ~$0.01 fees and finality in a single block; no hot keys leak to the frontend, because CDP Wallet signs on the server side only.

With one registry, one proxy, and one line of SDK code, MCPay brings real micropayments to the Model Context Protocol.