An EVM-compatible testnet for the Songbird canary network, enabling low-cost CFLR-based testing of Flare’s State Connector and FTSO-enabled dApps before mainnet deployment.
Songbird Testnet Coston is Flare’s EVM-compatible test network that mirrors the Songbird canary chain, using CFLR as its faucet-funded gas token. It’s used to safely develop and validate smart contracts, cross-chain bridges, and integrations with Flare’s FTSO oracle and State Connector before promotion to Songbird or Flare mainnet. For quick benchmarking, public explorers typically show ~2–3s block times, sub-cent gas for simple transfers, and burst TPS in the low hundreds, depending on load.
Coston uniquely exposes Flare-native data protocols—FTSO (decentralized time‑series oracle) and the State Connector—so developers can test on-chain price feeds and cross-chain/data attestations without third-party oracles. It pairs this with fast finality and low-cost execution (negligible CFLR fees and ~2s blocks) to enable realistic performance testing with higher TPS headroom than many public EVM testnets. This blend of built-in data acquisition, EVM tooling parity, and high-frequency block production makes Coston ideal for interoperability, oracle, and bridge testing.
Songbird Testnet Coston uses CFLR as the gas token for transaction fees. You can obtain CFLR by bridging from other chains or purchasing using thirdweb Bridge, or through faucets (for testnet).
To bridge CFLR to Songbird Testnet Coston, connect your wallet to thirdweb bridge, select your source chain, choose the token you want to bridge, select Songbird Testnet Coston as the destination, enter the amount, and confirm the transaction. The bridge will handle the cross-chain transfer instantly.
To build on Songbird Testnet Coston 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 Songbird Testnet Coston 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 CFLR on Songbird Testnet Coston, ensure your wallet is connected to the Songbird Testnet Coston network, enter the recipient's address, specify the amount of CFLR to send, review the gas fee, and confirm the transaction in your wallet.