# Gap v4: launch buys and the bundle kit

Pangea v3: every new launch, stock pairs and questions. Every launch since 2026-11-02 is a v3 launch, made by factory v3 on all five chains. This tab is everything new in v3: the factories, the fee hook, launch buys, stock pairs, the bridge price-gap fee, Solana, the security model, and plain-language questions and answers at the end. Bridging, routes and the APIs are in the V2 tab and hold for v3 except where this tab says otherwise. A Gap v4 coin lives on up to six worlds: Robinhood Chain, Base, Ethereum, BNB Chain (BSC), Solana and Elysium. The four EVM chains and Solana carry LayerZero and Hyperlane; Elysium (chain id 99901, gas in HYPE) carries Hyperlane only.

A v4 ticket answers `bundleKit: true` and `launchBuys: true` with `bundleKitV4`: each chain's mechanism and limits. The bundle kit is always on: it is never switched off, for any v4 launch kind on any chain. Neither choice locks out the other.

## Launch buys: inside our launch transaction

- EVM chains: the open runs every buy right after the seed, in the same transaction: your own buy, split dev buys, and other wallets' buys, each signed as one `LaunchBuy` (EIP-712). There is no count limit; the only limit is the transaction's gas (about 80 buys in 2^24 gas, `maxLaunchBuys` per chain). Ask at `POST /api/v1/launch/v4/sponsored/prepare` (`otherBuys`), send the signatures at `POST /api/v1/launch/v4/sponsored/submit`; a self-launch passes them to its own open.
- Solana: co-buys (`co_buys`) inside the one launch transaction, each co-payer a signer, or the creator's buy list.
- Solana buy list, who holds what: the money stays in the payer's own token account until the launch, which spends at most the approved amount and only for the launch the list names. The bought tokens wait in the list's own account until each is claimed to its named wallet (`claim_buy`, seconds after the launch), and the unused approval is ended with the reclaim the form offers right after the claims. A skipped or never-made launch spends nothing.

## The bundle kit: your own buys bundled with the launch

- The page hands out the held launch transaction (signed, not sent): your own open on a self-launch or open-later, or the platform's held open on a sponsored launch. The bundle builder puts it first and your buy transactions after it. Whoever sends the held transaction can only launch exactly that coin.
- Ethereum: a private bundle through Flashbots or Titan. BNB Chain: through 48 Club or BlockRazor. The bundle lands whole, in one block, launch first, or not at all.
- Base and Robinhood Chain have no bundle relay (one sequencer each). The kit sends the launch, waits until the sequencer accepts it, then sends every buy at once. They usually land in the same block, but that is not guaranteed and it is not atomic: a buy sent too early fails and costs its gas.
- Solana: one Jito bundle, the launch first, your buys after it.
- On Solana every v4 launch offers two ways for other wallets to buy at the launch, and you can use either or both. Launch buys: up to 8 co-payers (with any quote: USDC, SOL, Token-2022 or an xStock; 7 in a sponsored open, and 5 when the quote is priced through 2 route hops) sign the launch transaction itself and their buys run right after the pool opens, in the same transaction. Bundle kit: up to 12 more buyers sign their own small buy transactions, and the launch and their buys go to Jito as one bundle (at most 5 transactions): it lands all at once in one slot, the launch first, or not at all. The last buyer transaction pays the Jito tip. If the bundle relay does not take the launch transaction, the launch still goes out as usual with its launch buys, and the kit buyers simply do not buy.
- Buyers past the launch-buy gas limit go in the bundle kit. Using both: your launch buys run inside the launch, and your bundle's buys come right after it.

## The admin pause of new opens

The platform admin can pause new opens at once, with no wait: `setOpensPaused` on the EVM launch core, `set_paused` on the Solana launcher. While paused, every new launch and every open of a later chain is refused, the self launch and the platform-paid one alike. A coin already open is never touched: its trades, bridging, claims, launch-buy deposit withdrawals, handover and tokenomics all go on.

Part of the Pangea documentation, V3 (every new launch) tab: https://www.pangea.trade/app/docs.md