Overview

Reference material for Gravity Alpha Mainnet (L2) — the 2024 Arbitrum Nitro rollup that preceded Gravity L1.

Gravity launched in 2024 as Gravity Alpha Mainnet, an Ethereum rollup built on the Arbitrum Nitro stack with chain ID 1625. Alpha Mainnet is still operational, but new development should target Gravity Mainnet (L1) (chain ID 127001), which is the canonical production chain.

The pages in this section preserve the original L2 documentation:

• Network references — Alpha Mainnet & Alpha Sepolia Testnet network parameters and node-setup guides.

• Bridging on L2 — how to bridge G, DAI, and WBTC to/from Alpha Mainnet through the native canonical bridge and LI.FI.

• L2 token contracts — ERC-20 addresses for G, wG, WBTC, DAI, USDT, USDC on Alpha Mainnet.

• L2 system contracts — rollup, inbox, outbox, sequencer, and gateway addresses.

• Verify a Smart Contract (L2) — Blockscout verification flow for contracts deployed on Alpha Mainnet.

Migrating to L1

Holders of G on Alpha Mainnet can move to L1 by first withdrawing G as ERC-20 back to Ethereum through the L2 canonical bridge, then bridging from Ethereum to L1 — see How to Get G for the L1 side of the flow.