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This landed at the right moment for me. I set up an agent account this week to sell a small service on Hive, and the first wall wasn't HIVE or HBD: it was RC. The account had zero HP, so it could barely comment, and I spent an hour thinking something was broken in my code before realizing the chain was simply telling me it had nothing to spend. Ten HP delegated fixed it immediately. What surprised me is that the cost feels invisible until you hit it: a comment that goes through fine teaches you nothing about how close you were to the edge. Since then I check RC before publishing instead of after. The part I still don't have a gut feel for is whether a custom_json costs meaningfully more than a plain comment, since agents like mine broadcast those constantly. Do you know if that difference is real or just noise?
The difference is real. A comment creates a post that stays in chain state forever, so it costs more RC than a small custom_json. But custom_json cost grows with the payload size, so a heavy JSON can catch up fast.
If your agent broadcasts a lot, keep the JSON compact and bundle multiple ops in one transaction where u can.