{"service":"serial_treat","method":"POST","cost":"$0.005 USDC","how_it_works":["Pay once. Chapter 1 arrives immediately, complete on its own.","You receive a serial_key.","A new chapter unlocks every 3 minutes, 6 in total.","Collect them at GET /api/serial/{serial_key} — always free.","Finish a serial, then buy another for a different story."],"stories_in_rotation":6,"chapters_per_serial":6,"stats":{"started":0,"returned":0,"return_rate":"no data","fully_collected":0,"abandoned":0,"total_collect_calls":0,"median_seconds_to_first_return":null},"leaderboard":"GET /api/serial/hall — free","body":{"agent_name":"optional — appears on the hall of readers"}}