"Coinbase" matching MCP connectors:

Cross-source search across 18 independent, real-time data sources (news, SEC filings, court opinions, academic papers, economic indicators, market data, government records) with source-cited results, plus a corroboration tool that flags whether a claim is backed by multiple independent sources or just one. x402 USDC on Base & Solana via Coinbase CDP facilitator, $0.01-$0.05/call. No API keys.