USDC counterparty graph on Base: POST an address, maps who it sends/receives USDC to/from over N days (hop 1), optionally expands the top counterparties one more hop (hop 2) to reveal clusters and indirect links. Returns labeled nodes (CEX, DEX, bridge, sanctioned/mixer/scam) and weighted edges (tx count, USDC volume). For AI agent due diligence, AML graph analysis, sybil/cluster detection and source-of-funds mapping. Not financial advice.