Testnet Faucet
Umbra runs on Flare Coston2. The Faucet page helps you get the three Coston2 testnet assets, plus a fourth card for bridging in real Bitcoin (signet).
What you can get
| Asset | Name | Decimals |
|---|---|---|
C2FLR | Coston2 Flare — native gas token | 18 |
FXRP | FAssets XRP — real bridge | 6 |
USDT0 | Tether USD — testnet | 6 |
BTC | Real Bitcoin, signet | 8 |
The first three are real Coston2 assets minted by Flare’s own faucet.
FXRP in particular comes from the actual FAssets bridge, not a simulated
mint. BTC is real signet Bitcoin, bridged in via a Noir proof — see
Bitcoin Bridge.
How the Coston2 cards work
The page deep-links to Flare’s faucet rather than minting anything itself — the point of this app is genuine FAssets integration, not a fake token.
When you open the faucet link from an asset card, Umbra records your current balance as a baseline and starts watching. It polls every 5 seconds and refetches the moment you tab back in, so the card flashes Received as soon as tokens land. No manual balance checking.
How the BTC card works
The BTC card auto-derives a signet deposit address from your connected wallet the moment you connect — no separate wallet, no manual “Derive” step. Copy that address, send it real signet BTC from any signet faucet or wallet, and wait for it to confirm (real Bitcoin block time, roughly ~10 minutes on average but with real variance).
Once confirmed, the card automatically builds, signs, and broadcasts
the deposit transaction itself — no click required. From there, proving
and minting are handled entirely by the backend; your WrappedBTC balance
just appears once it lands.
Minting can still take a little while — that’s normal. The last step before minting — an on-chain Bitcoin “checkpoint” advancing to cover your deposit’s exact confirming height — now happens automatically (a scheduled worker proves and submits each advance, no admin step), but it still paces real signet block production, roughly 10 minutes per block. If your balance doesn’t update within about an hour of your deposit transaction confirming, check whether that worker is actually running for this deployment before assuming something’s wrong — see Bitcoin Bridge for the full explanation.
Requirements
- Wallet connected
- Network set to Flare Coston2, chain ID
114, for the three Coston2 cards (the BTC card’s own address derivation and balance work as soon as a wallet is connected, independent of which EVM network is selected)
Coston2 balances only load on Coston2; on any other network those three cards stay inert.
USDC is not available. There’s no official USDC on Coston2 yet. The page shows it as coming soon rather than faking a mint, and a clearly-labeled testnet mock will ship if and when it’s needed.
Next
With C2FLR for gas and at least one tradeable asset, head to Shield to make your first deposit.