Stored in the metadata JSON on IPFS, not on-chain, no byte cap from the pad.
Bare handles are expanded to full links before they are pinned.
HYPE spent buying your own coin in the same transaction that creates the pool. The token caps any wallet at 3% of supply for the first hour, and the cap is enforced inside the launch, going over does not trim the buy, it reverts the entire launch. 1.2 HYPE buys 2.898% and is the measured ceiling.