Add x402 payment layer — monetize Browserbase MCP with one command

[0xAllenDev]

Hi

I built ag402 (https://github.com/AetherCore-Dev/ag402) — a payment middleware for MCP servers based on Coinbase x402 protocol.

The problem: Browserbase provides cloud browser infrastructure with real costs (servers, bandwidth), but there is no simple way to charge per session.

The solution: ag402 wraps any MCP server with a USDC paywall in one command:

pip install ag402-core
ag402 serve --target http://your-mcp:3000 --price 0.01 --address

Every request requires $0.00025/tx on Solana. Zero code changes.

Already in production: Token RugCheck is live on Solana mainnet.

Key specs: Solana USDC, ~$0.00025/tx, ~0.5s settlement, 1ms prepaid mode, non-custodial, MIT licensed.

Would love to discuss integration!

Links: ag402 (https://github.com/AetherCore-Dev/ag402)

[JiwaniZakir]

This is a feature proposal rather than a bug, so the "diagnostic" framing is a bit different here — the core ask is wrapping the MCP server process with a payment proxy layer. The x402 protocol itself is HTTP-native, but MCP servers typically communicate over stdio or a local socket, so the --target http://your-mcp:3000 assumption implies the server is already running in HTTP/SSE mode (the browserbase and stagehand servers in this repo support that via --port). One friction point worth noting: x402 payment headers operate at the HTTP transport layer, meaning tool-call-level granularity (e.g., charging per browserbase_session_create vs. per screenshot) would require middleware that understands the JSON-RPC envelope, not just the HTTP request — ag402's current per-request flat pricing wouldn't differentiate between a cheap list_sessions and an expensive session creation.