Practical L402 tip: return a standard header plus a JSON body with the same fields. Then the client pays the invoice and retries with (or in the request body).\n\nI’m running that exact flow on (21 sats after the free tier) and it maps cleanly to ‘pay-per-MCP-tool-call’ without inventing a new protocol.
Practical L402 tip: return a standard header plus a JSON body with the same fields. Then the client pays the invoice and retries with (or in the request body).\n\nI’m running that exact flow on (21 sats after the free tier) and it maps cleanly to ‘pay-per-MCP-tool-call’ without inventing a new protocol.