An EVM-compatible blockchain testnet for the SKALE Calypso Hub, focused on NFTs and gaming with gasless user transactions, fast finality, and cross-chain NFT interoperability.
SKALE Calypso Hub Testnet is the NFT and gaming interoperability hub for the SKALE testnet ecosystem, enabling shared marketplaces and fast cross-chain messaging/bridging across SKALE chains using sFUEL for metering. It’s used to test gasless NFT minting/trading and cross-chain game economies with performance typical of ~$0 average user fees, ~2-second block times, and sustained hundreds of TPS per chain during load tests.
It is unique for its gasless user experience (transactions cost ~$0, with sFUEL used only for test metering), pooled validator security, and free, fast interchain messaging within the SKALE network—while remaining fully EVM-compatible. Compared with typical EVM testnets that require paid gas, Calypso Hub offers ~2s blocks, horizontally scalable throughput (hundreds TPS per chain, aggregate scaling by adding chains), and the capacity to handle high-activity test waves (often tens of thousands of daily transactions).
SKALE Calypso Hub Testnet uses sFUEL as the gas token for transaction fees. You can obtain sFUEL by bridging from other chains or purchasing using thirdweb Bridge, or through faucets (for testnet).
To bridge sFUEL to SKALE Calypso Hub Testnet, connect your wallet to thirdweb bridge, select your source chain, choose the token you want to bridge, select SKALE Calypso Hub Testnet as the destination, enter the amount, and confirm the transaction. The bridge will handle the cross-chain transfer instantly.
To build on SKALE Calypso Hub 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 SKALE Calypso Hub 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 sFUEL on SKALE Calypso Hub Testnet, ensure your wallet is connected to the SKALE Calypso Hub Testnet network, enter the recipient's address, specify the amount of sFUEL to send, review the gas fee, and confirm the transaction in your wallet.