An EVM-compatible testnet for Flare, Coston2 enables low-cost smart-contract testing with native decentralized data: FTSO price feeds and State Connector cross-chain proofs.
Flare Testnet Coston2 is Flare’s public EVM-compatible test network, using the C2FLR token, for validating dApps, bridges, and on-chain data integrations before mainnet. Developers use it to test smart contracts, the FTSO decentralized price oracle, the State Connector for cross-chain/web2 data, and end‑to‑end bridging flows. Performance for comparison: gas is effectively free via faucet (testnet), block times are typically a few seconds (~2–3s), and throughput reaches tens of TPS under public test loads with steady activity from FTSO submissions and developer transactions.
Coston2 is unique because it exposes Flare’s native data acquisition stack—the FTSO oracle and the State Connector—directly at the protocol level, enabling trust-minimized cross-chain data and price feeds without relying on centralized bridges. Compared with typical EVM testnets, it offers faster blocks (few seconds vs ~12s on Ethereum), near-zero testnet fees with mainnet-equivalent gas semantics, and active validator/FTSO provider participation for realistic performance (tens of TPS under load) and integration testing.
Flare Testnet Coston2 uses C2FLR as the gas token for transaction fees. You can obtain C2FLR by bridging from other chains or purchasing using thirdweb Bridge, or through faucets (for testnet).
To bridge C2FLR to Flare Testnet Coston2, connect your wallet to thirdweb bridge, select your source chain, choose the token you want to bridge, select Flare Testnet Coston2 as the destination, enter the amount, and confirm the transaction. The bridge will handle the cross-chain transfer instantly.
To build on Flare Testnet Coston2 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 Flare Testnet Coston2 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 C2FLR on Flare Testnet Coston2, ensure your wallet is connected to the Flare Testnet Coston2 network, enter the recipient's address, specify the amount of C2FLR to send, review the gas fee, and confirm the transaction in your wallet.