// FAQ
Frequently Asked Questions
What is Rails? +
Rails is a cross-chain bridge and swap protocol built on TRON. It allows users to transfer assets between 36+ blockchain networks in under 60 seconds, using MPC + ZK proofs for security, with a flat 0.1% fee.
How fast are bridge transfers on Rails? +
The average bridge transfer completes in 42 seconds. Solana takes ~28s, BSC ~30s, Polygon ~35s, and Ethereum ~45s — significantly faster than traditional bridges.
What security measures does Rails use? +
Rails uses Multi‑Party Computation (MPC) across 15+ nodes for private key management, and Zero‑Knowledge Proofs (ZK) to verify state changes across chains. Audited by CertiK, PeckShield, Hacken, and Trail of Bits.
What are the fees on Rails? +
A flat 0.1% bridge fee applies to all transfers. Combined with TRON’s near‑zero gas fees, Rails is one of the most cost‑effective bridges in DeFi.
Which assets can I bridge or swap on Rails? +
You can bridge native tokens (TRX, ETH, BNB, MATIC, SOL) and stablecoins (USDT, USDC) as well as many TRC‑20 and ERC‑20 tokens. New assets are added via governance votes.
How many blockchains does Rails support? +
Currently Rails supports 36+ chains including TRON, Ethereum, BSC, Polygon, Arbitrum, Optimism, Base, Solana, zkSync, and many others.
Is Rails a decentralized protocol? +
Yes, Rails is fully non‑custodial and governed by RAILX token holders through a DAO. No single entity controls the bridge or can freeze user funds.
What is the RAILX token used for? +
RAILX is the governance token of the protocol. Holders can vote on chain integrations, fee adjustments, treasury allocations, and protocol upgrades.
Can I swap tokens directly on Rails? +
Yes, Rails supports atomic bridge‑swaps — you can convert one asset to another (e.g., TRX to USDT on Ethereum) in a single transaction without intermediate steps.
What wallets are compatible with Rails? +
Rails supports TronLink, WalletConnect, MetaMask, TokenPocket, and any wallet that supports TRON or EVM chains.
How do I connect my wallet to Rails? +
Click the “Connect Wallet” button in the top‑right corner, choose your preferred wallet (TronLink, MetaMask, etc.), and follow the connection prompts.
Can I use Rails on mobile devices? +
Absolutely. The interface is fully responsive and works with mobile wallets like TronLink, Trust Wallet, and TokenPocket via WalletConnect.
How do I track my bridge transaction? +
All transfers are visible in the “History” tab with on‑chain transaction hashes at every hop. You can also check the status on the source and destination chain explorers.
What happens if a bridge transfer fails? +
In the rare event of a failure, funds are automatically refunded to your source address within 10 minutes. You can also manually retry the transfer using the same hash.
Is there a minimum or maximum amount for bridging? +
There is no minimum amount, but very small amounts may not be economically viable due to gas fees. The maximum is determined by the liquidity available on the destination chain.
How does Rails achieve such fast transfer times? +
Rails uses optimistic verification with pre‑funded relayer pools that settle transactions quickly, combined with TRON’s high throughput (2,000+ TPS) for near‑instant finality.
Are my funds safe if the protocol is hacked? +
The protocol has a 24‑hour time‑locked emergency pause that allows users to withdraw their funds before any upgrade takes effect. Additionally, MPC and ZK proofs minimize the attack surface.
What is the bug bounty program? +
Rails offers a $5M bug bounty — the highest in TRON DeFi — to reward security researchers who responsibly disclose vulnerabilities.
Can I earn yield on my bridged assets? +
Yes, many bridged assets can be used in liquidity pools or staking on the destination chain. Details are available in the respective ecosystem.
Does Rails support cross‑chain swaps without bridging? +
Yes, the atomic bridge‑swap feature allows you to swap assets across chains directly — e.g., swap TRX on TRON for USDC on Arbitrum in one transaction.
How are fees calculated? +
The 0.1% fee is deducted from the source amount. Gas fees are paid separately on each chain and are not included in the bridge fee.
Can I bridge stablecoins like USDT and USDC? +
Yes, both USDT and USDC are fully supported across all 36+ chains, using native versions where available.
Is there a limit on daily bridge volume? +
There is no hard cap, but large transfers may be subject to dynamic slippage protection and liquidity checks. The protocol can handle billions in daily volume.
How does Rails handle price slippage during swaps? +
Rails integrates with major DEX aggregators on each chain to get the best possible price with minimal slippage, and you can set your own slippage tolerance.
Can I cancel a pending transaction? +
Once a transaction is submitted to the blockchain, it cannot be cancelled. If it’s stuck, you can replace it with a higher gas fee using your wallet’s “speed up” feature.
What is the total value locked (TVL) on Rails? +
Currently the TVL exceeds $480 million, with a track record of zero security incidents.
How often are new chains added? +
New chains are added regularly through governance proposals. Typically 2‑4 new chains are integrated each month based on community demand.
Can I provide liquidity to the bridge? +
Yes, liquidity providers can deposit assets into the bridge pools and earn a share of the bridge fees and swap spreads. More details are available in the “Earn” section.
What happens to my funds during a protocol upgrade? +
All upgrades are time‑locked for 24 hours. During this period, you can withdraw your funds at any time. The bridge remains operational during most upgrades.
Is Rails audited? +
Yes, Rails has been audited by CertiK, PeckShield, Hacken, and Trail of Bits, with all reports publicly available on the website.
Can I use Rails without KYC? +
Absolutely. Rails is fully permissionless and non‑custodial — no KYC or registration is required. Just connect your wallet and start bridging.
What is the difference between a bridge and a swap on Rails? +
A bridge moves the same asset across chains (e.g., USDT on TRON → USDT on Ethereum). A swap exchanges one asset for another (e.g., TRX → USDT) and can optionally bridge the result to another chain.
Can I bridge non‑fungible tokens (NFTs)? +
Currently, Rails focuses on fungible tokens. NFT support is on the roadmap and will be added in a future version.
How does Rails compare to other bridges like Multichain or Wormhole? +
Rails is faster (42s avg.), cheaper (0.1% fee), and more secure with MPC+ZK. It also offers atomic swaps and is native to TRON, giving it lower latency and cost than many competitors.
Is there a referral or rewards program? +
Yes, Rails has a referral program where you can earn a percentage of the fees generated by users you invite. Check the “Referrals” page for details.
Can I use Rails with a hardware wallet? +
Yes, hardware wallets like Ledger and Trezor are supported via TronLink and MetaMask. Always ensure you approve transactions on your device.
What is the maximum slip‑age allowed for swaps? +
You can set your own slippage tolerance (default is 1%). For high‑volatility assets, you may want to increase it to avoid failed transactions.
Does Rails have a mobile app? +
There is no dedicated app yet, but the web interface is fully responsive and works perfectly on mobile browsers with any Web3 wallet.
How can I contact support if I have issues? +
You can reach out via the official Telegram group, Discord server, or submit a ticket through the support page. Our team responds within 24 hours.
What are the future plans for Rails? +
We plan to add more chains, support for NFTs, a mobile app, advanced limit orders, and deeper integration with leading DeFi protocols. All upgrades will be governed by the DAO.