There are two ways in: SOL, like any token, or the collectible itself.

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Pay with SOL

1

Open the market and pick an amount

The trade panel quotes exactly what you will receive, the 0.70% fee, and the price impact before you sign.
2

Confirm

On the curve your buy moves the price along the launch curve; after migration it trades against the AMM pool. Either way the fill lands in one transaction.

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Pay with the collectible

If you hold a registered on-chain copy of the underlying (a vaulted card NFT or a collection NFT), you can deposit it instead of paying SOL.
1

Switch to 'Pay with the collectible'

The panel detects registered copies in your wallet and shows the item’s live value.
2

Deposit

You receive tokens equal in value to the copy at the current price: not a fixed amount. If the token trades cheap, one copy buys more tokens; if it trades rich, fewer. The copy goes into the market’s escrow, where anyone exiting can later claim it.
Item deposits work in both phases: on the curve from the very first block, and on the AMM after migration. Pricing uses a smoothed mark, so the rate cannot be manipulated inside a single transaction.
Paying with the collectible is feeless. SOL trades pay the 0.70% fee; depositing a real copy pays nothing, by design: bringing the real thing into the pool is the behavior the protocol most wants to reward.