GET /x402/catalog
GET /x402/match?q=0.01 USDC
GET /x402/license?track=&licensee=1 USDC
GET /x402/verify?id=
curl -i "https://sync.hucori.app/x402/match?q=calm+piano+for+a+study+video"
# HTTP/2 402  +  PAYMENT-REQUIRED header (x402 v2)  +  JSON body (x402 v1)
# pay 0.01 USDC with any x402 client, retry, get ranked tracks