Across Protocol integration for Belgian tax reporting
Bridge your assets faster between Ethereum and Layer 2s and let Cryptotax automatically calculate the tax impact. We detect every intent, bridging fee and ACX reward so your report matches Belgian rules exactly.
Start Across trackingWhat is Across Protocol?
Across is a cross-chain bridge that uses intent-based transfers to move value at high speed between Ethereum and Layer 2 networks such as Arbitrum, Optimism and Base. The protocol builds on UMA's optimistic oracle and competitive relayers for security and efficiency.
Intents instead of lock & mint
Users formulate an intent such as "move 1 ETH from Ethereum to Arbitrum". Relayers compete to fulfil the intent and advance the funds on the destination chain. After the oracle validates it, they receive their stake back plus a fee.
Capital-efficient design
Across uses a single global liquidity pool instead of fragmented pools per chain. This keeps liquidity concentrated, lowers costs and allows bridging to settle within minutes.
Supported chains and tokens
Ethereum mainnet, Arbitrum, Optimism, Base, Polygon and other rollups are supported. Popular assets such as ETH, WETH, USDC, DAI and WBTC can be moved via Across and in some intents swapped immediately.
How does Across work technically?
The protocol consists of three layers that together deliver fast, cheap and safe bridge experiences.
Request for Quote layer
- User or dApp defines intent, desired asset and destination chain.
- Fees are shown transparently upfront, including a component for relayers and LPs.
- Cryptotax stores this metadata to book fees correctly.
Relayer network
- Solvers front-run liquidity on the destination chain and receive compensation later.
- Competition keeps wait times low; most transfers settle within minutes.
- We identify these fast outgoing and incoming movements as a single bridge transaction.
Settlement with UMA oracle
- The UMA ecosystem validates whether a relayer acted correctly.
- Errors or fraud are disputed within the optimistic window.
- For tax purposes we record when final settlement occurs and what value was settled.
Why is Across relevant for Belgian tax?
Cross-chain activity brings unique reporting obligations. Cryptotax helps Belgian users to correctly distinguish between bridge transfers, swaps and income.
Bridging is a transfer
An intent that sends asset A on chain X to chain Y is typically a non-taxable movement. You still need to show that the asset remains the same. We link the outgoing and incoming transaction and value the fee in EUR.
Intents can include swaps
Some intents simultaneously swap into a different token or trigger an action on the destination chain. Cryptotax detects this combination and splits the swap as a sale/purchase event when needed for tax purposes.
ACX and LP rewards
Liquidity providers receive fees and sometimes ACX token incentives. These proceeds are recorded as income and added to your portfolio history so write-downs or sales can be correctly accounted for later.
Costs as a deduction
Relayer fees and gas on both the source and destination chain are registered separately. This gives you a complete cost statement for any deductible expenses or valuation of the net bridge.
How does Cryptotax support your Across activity?
Our tax engine is built with bridge detection, cross-chain matching and price data in mind.
Automated intent matching
- Identifies Across contracts and events based on our bridge registry.
- Matches outgoing and incoming transfers within the same intent and labels the chains involved.
- Adds context to reports so your exact route is visible.
Fee analysis
- Books protocol fees, relayer tips and gas separately.
- Calculates EUR value at the moment of bridging using CoinGecko prices.
- Provides a cost overview so accountants can verify easily.
ACX tracking
- Detects ACX airdrops, staking or accelerator rewards.
- Classifies income in the correct tax category (e.g. miscellaneous income).
- Tracks later sales or staking of ACX for correct capital gain calculation.
LP position monitoring
- Records deposits, withdrawals and returns from the Across pool.
- Values positions daily in EUR for portfolio overviews.
- Makes a clear distinction between capital and rewards.
Key tax considerations
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Bridge transfers remain linked.
We link your outgoing and incoming transaction, including timestamps and chains, so you can demonstrate that it is a technical transfer and not a sale. Read more about transfer matching →
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Swaps during intents = realizations.
When Across converts to a different token along the way, we record a sale/purchase event with the correct cost price and realized capital gain or loss in EUR.
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Fees form cost basis.
Gas, relayer fees and protocol costs are booked separately and can be deducted when you use the bridge for transfers between your own wallets.
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LP rewards are taxable.
ACX and fee income from the hub pool are classified as movable income or miscellaneous income, valued at the moment of receipt.
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Risk events are logged.
Longer wait times or potential disputes with the UMA oracle are noted as warnings, so you know when settlement occurred later and whether additional supporting documents are needed.
Belgian crypto tax 2026
Start your Across reporting today
Connect your wallet, import your Across intent history and get immediate insight into your Belgian tax position. Cryptotax makes it easy to document bridges, swaps and rewards.
Try Cryptotax for free