paidfor is an index of x402 sellers built by paying them.
It buys their endpoints with USDC on Base, checks what was delivered, and records every failure: no delivery after payment, a quote above the listed price, a changed pay-to address, or a malformed response. The connector reads that public index.
https://mcp.paidfor.dev/mcpNone in the store listings. The server needs sign-in, so we could not check it