Search the HTS by product words or a code prefix (pay per call in USDC via x402, no key)

Keyword search over every HTS line (its own text and the headings above it). Each result has the code, description, general rate, a one-line Section 301 summary and the reduction-list flag. Send a number to list the lines under that code prefix.

Pay per call with x402: $0.012 per call in USDC on Base. No key, no account: an unpaid call returns 402 with the payment requirements; retry with the X-PAYMENT (x402 v1) or PAYMENT-SIGNATURE (v2) header.