x402 endpoint rankings and seller score leaderboard for paid API discovery: compare resources by revenue proof, buyer breadth, price, metadata quality, and reliability signals. Price 0.08 USDC on Base via x402. Free preview: https://x402-market-intel-mcp.mtree.workers.dev/preview/endpoint_rankings?source=x402_manifest. Demo: https://x402-market-intel-mcp.mtree.workers.dev/demo/endpoint_rankings. Contact: https://x402-market-intel-mcp.mtree.workers.dev/contact.