An EVM-compatible testnet for the U2U ecosystem (chain ID 2484), Unicorn Ultra Nebulas offers high throughput, low fees, and fast finality using U2U for gas.
Unicorn Ultra Nebulas Testnet is the public pre-production network for the U2U blockchain, letting teams test EVM-compatible smart contracts, wallets, nodes, and the native cross-chain bridge with free faucet U2U before mainnet deployment. It targets low fees (average gas cost is negligible in testnet U2U), fast block speed (~1–2s target) and high throughput (hundreds of TPS under stress conditions), with live activity metrics (block time, TPS, gas) accessible via links on uniultra.xyz; for context, Ethereum Sepolia typically runs ~12s blocks with higher gas variability. This environment mirrors mainnet parameters so developers can validate performance, security, and cross-chain flows end-to-end.
Nebulas Testnet stands out for its native cross-chain bridging focus combined with EVM-equivalent execution, delivering low-fee, fast-finality blocks that accelerate developer feedback loops versus general-purpose testnets like Sepolia or Polygon Amoy. Its performance targets—negligible average gas cost in testnet U2U, ~1–2s block cadence, and burst throughput in the hundreds of TPS—offer quicker confirmations and higher load tolerance, while explorer dashboards linked from uniultra.xyz surface real-time activity for comparison. The stack also provides production-parity tooling (RPCs, faucets, monitoring, validator ops) so dApps can rehearse asset and message transfers across chains under realistic conditions.
Unicorn Ultra Nebulas Testnet uses U2U as the gas token for transaction fees. You can obtain U2U by bridging from other chains or purchasing using thirdweb Bridge, or through faucets (for testnet).
To bridge U2U to Unicorn Ultra Nebulas Testnet, connect your wallet to thirdweb bridge, select your source chain, choose the token you want to bridge, select Unicorn Ultra Nebulas Testnet as the destination, enter the amount, and confirm the transaction. The bridge will handle the cross-chain transfer instantly.
To build on Unicorn Ultra Nebulas Testnet you can use thirdweb, which provides an easy way to build, monetize and scale your apps, games or agents. You can find detailed guides and documentation on https://portal.thirdweb.com to get started quickly.
To add Unicorn Ultra Nebulas Testnet to your wallet, you can connect your wallet and click on [Add to Wallet] button at the top of the page. Alternatively, you can add the network manually using the RPC URL and chain details and add it to your wallet's network settings.
To send U2U on Unicorn Ultra Nebulas Testnet, ensure your wallet is connected to the Unicorn Ultra Nebulas Testnet network, enter the recipient's address, specify the amount of U2U to send, review the gas fee, and confirm the transaction in your wallet.