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Overview

The Bridge moves funds between your Spark account and external blockchains through Flashnet Orchestra. It works in both directions:
  • Deposit - Send assets from an external chain (for example USDC on Ethereum or Solana) and receive BTC or USDB on your Spark account.
  • Withdraw - Send from Spark to a supported destination on an external chain. Pasting an external-chain address in the Withdraw flow detects the compatible bridge routes automatically.
The Bridge moves funds across chains. To exchange one asset for another inside your wallet, use Swaps.

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Supported Networks

Available routes come from Flashnet Orchestra and can change over time. Networks surfaced in the bridge UI include Ethereum, Base, Arbitrum, Optimism, Polygon, Solana, Tron, Avalanche, BNB Chain, HyperCore, and HyperEVM, with common assets such as BTC, USDT, and USDC. Use the network filter and the BTC / USDT / USDC quick chips in the asset picker to narrow the route list. Bridge source asset picker listing BTC, USDC on Base, and USDT on Ethereum with a search field

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Bridging In (Deposit)

1

Open Bridge

Open Bridge from the dashboard.
2

Pick the Source

Choose the source chain and asset you will send from. Use the network filter or quick chips to find it faster.
3

Pick the Destination

Choose what you want to receive on Spark: BTC or USDB.
4

Get a Quote

Enter the amount. The extension fetches a quote showing the expected output, fees, and limits.
5

Send the Funds

The bridge shows a deposit address (with QR code) on the source chain. Send the quoted amount from your external wallet.
6

Track the Order

The order status updates as the deposit confirms and the funds arrive on Spark. Orders are persisted, so tracking resumes even if you close the extension mid-bridge.
Bridge deposit quote showing amount sent, estimated amount received, fee in basis points, and expiry above the deposit QR code Bridge deposit address with QR code, copyable address, a waiting for deposit status, and a field to paste the transaction hash

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Bridging Out (Withdraw)

Cross-chain withdrawals start from the regular Withdraw flow:
1

Paste the Destination

Paste an address on the destination chain (for example an EVM or Solana address). The extension detects which bridge routes can reach it.
2

Choose Route and Amount

Pick the destination asset and enter the amount. By default the amount pins what you send, and the quote shows the expected output. On eligible routes you can switch to a You receive (exact-out) mode that pins what the recipient gets instead.
3

Review and Confirm

Review the destination, output amount, and fees, then confirm. The extension pays from your Spark account and the bridge delivers on the destination chain.
4

Track the Order

Order progress is tracked persistently until completion, surviving extension restarts.
Cross-chain withdrawal detected in the Withdraw flow, with destination network, recipient address, receive token, exact-out amount, and fee

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Order Tracking and Recovery

Bridge orders are saved locally as a session. If the extension closes or the service worker restarts while an order is in flight, the bridge screen restores the pending order and continues tracking it. Completed and failed orders show their final status with the relevant transaction references. Bridge order processing with a six stage progress list from processing to completed, plus the route and order ID

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Tips

Cross-chain transfers are irreversible. Double-check the destination address and chain before confirming.
Quotes include minimum and maximum amounts. Sending outside the quoted amount on a deposit can delay or strand the order.
Tracking recovers automatically after a restart, but keeping the screen open gives you live status updates.

Access the Beta

Request access to the KaleidoSwap Extension closed beta.