Is this payer a real repeat customer, or a one-shot sampler? — The payer-trust mirror of x402-seller-check. Reads a wallet's outgoing USDC payments on Base over 90 days: distinct sellers paid (breadth), total payments and USDC (depth), and whether it ever paid the same payee twice. Breadth with no depth in a short burst is the crawler/sampler pattern; a repeat or sustained payer is the opposite. Sees only Base USDC; absence reads as 'thin', never bad. Not financial advice. Required input: wallet. Priced $0.03 per call over x402 on Base; send a prepaid x-credit-token header for unlimited calls, or get 1 free call/day per tool. No wallet or API key required.