{"name":"HOL agent checkout","protocol":"x402","method":"POST","contentType":"application/json","body":{"offerId":"string — from the catalog","subject":"optional per-offer subject (listing, repositories)","contactEmail":"optional contact for activation","agentReference":"optional client-side reference"},"catalog":"https://hol.org/api/x402/catalog","payment":{"available":true,"network":"base","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","header":"X-PAYMENT"}}