Elysium network

Elysium is Kinetiq's Arbitrum Orbit chain. It settles on HyperEVM and uses HYPE for gas.

The testnet is chain 99801, with RPC https://testnet-rpc.elysium.kinetiq.xyz. It runs its own deployment, and none of the addresses in these docs apply there.

Which RPC to use#

Elysium has no open public sequencer endpoint yet. Community RPCs serve reads, but most only relay transactions for their own apps, and will refuse or silently drop yours. A wallet pointed at the wrong one can fail with a generic error, or show a transaction as pending forever.

Use the Tartarus RPC. It serves everything a wallet needs and gets Tartarus transactions onto the chain. If your wallet already has Elysium added with another RPC, change it there: wallets keep their own network settings and ignore what a site suggests.

Sending transactions#

eth_sendRawTransaction tries the sequencer relay first. If that refuses, the transaction goes through Elysium's delayed inbox on HyperEVM instead. This takes about 15 to 30 seconds rather than under a second. The same hash is returned either way, so your code does not change: just wait for the receipt.

That fallback is paid for by Tartarus, so it only carries transactions to Tartarus contracts, UniversalRouter, Permit2, launched tokens, approved quote tokens and rewards distributors. Other transactions, including plain HYPE transfers, may be declined with notAllowed.

Gas#

Gas costs very little: a swap costs a fraction of a cent. There are two things to get right.

• Set maxFeePerGas above the base fee. A transaction priced below it is dropped with no error, and never appears on chain. eth_gasPrice on the Tartarus RPC returns double the base fee to leave headroom, and wallets on an unrecognized network tend to use that value directly.
• Tips are not paid. Arbitrum Orbit chains have no priority auction, so maxPriorityFeePerGas of 0 is fine.

eth_estimateGas is reliable on every Tartarus path, since no swap can trigger a migration or any other hidden work. A plain launch uses about 1.55M gas.

Bridging HYPE#

The Bridge page calls Elysium's canonical rollup contracts directly, and nothing is held by Tartarus. HYPE moves 1:1 to the same address, with no bridge fee beyond network gas.

A withdrawal is two transactions. The first leaves Elysium straight away. The second pays out on HyperEVM once the rollup confirms it, after a challenge period of 483,840 HyperEVM blocks plus the wait for the next assertion. Nothing can shorten it or cancel it, and the claim needs a little HYPE for gas on HyperEVM. The wait is read from the rollup, since Kinetiq has not published the mainnet figure.

Use a regular wallet. depositEth credits a contract at an aliased address it cannot spend from, which includes Safes, smart accounts and EIP-7702 delegated accounts. The Bridge page refuses them.

To claim from your own code, GET /bridge/withdrawals/:address returns each withdrawal with the Outbox.executeTransaction arguments, proof included, once it is ready. See API.

Bridging only moves HYPE. Tartarus tokens do not bridge yet. See HyperCore.

Indexing#

Start from block 701345, where the factory was deployed. TokenLaunched gives you the token, pool and terms; LaunchSalt fires just before it in the same transaction. Swap on the PoolManager, filtered by poolId, gives you trades. The Events page has every topic0.

The node behind the RPC is pruned, so state older than a few minutes is unavailable, and calls pinned to an old block return a "missing trie node" error. Logs remain available. If you need historical state, you will need your own archive node. Or use the API, which indexes everything for you.