Railgun RAIL

What is Railgun?

Railgun is a privacy smart-contract system deployed on Ethereum, Polygon, BNB Chain, and Arbitrum. It allows users to shield ERC-20 tokens, execute swaps, and interact with DeFi protocols without exposing wallet addresses or transaction amounts on-chain. Railgun's privacy is enforced entirely by zero-knowledge proofs — there is no trusted hardware, off-chain relayer set, or wrapped-token mechanism.

The RAIL token governs the Railgun DAO and receives a share of protocol fee revenue. Unlike most privacy projects, Railgun does not build its own blockchain. Instead, it deploys shielded pool smart contracts on existing EVM chains, meaning users keep their preferred chain's security model and liquidity while gaining transaction privacy on top.

Railgun price today

RAIL is listed on Uniswap, SushiSwap, and a small selection of centralized venues. Liquidity is concentrated in DeFi pools, which makes the price sensitive to pool depth shifts.

What drives the RAIL price:

• Protocol fee revenue. RAIL stakers receive a portion of the shield/unshield fees collected across all supported chains. Higher protocol usage translates to higher staking yield.
• EVM chain expansion. Each new supported chain (e.g., Arbitrum, future L2 additions) increases total addressable shield volume.
• DeFi privacy narrative. Regulatory discussion of on-chain transaction tracing and MEV extraction tends to boost interest in privacy middleware like Railgun.
• OFAC sanction events. The Tornado Cash sanction in 2022 raised the regulatory risk profile of on-chain privacy tools broadly, including Railgun.
• zkSNARK performance improvements. Circuit optimizations that reduce proof generation time make the protocol cheaper and more attractive to end users.

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How Railgun zero-knowledge privacy works

Railgun implements a shielded pool based on Groth16 zk-SNARK proofs and a UTXO-style note model, similar in architecture to Zcash shielded transactions but deployed as a smart contract rather than a standalone chain. Users deposit ERC-20 tokens into the shielded pool and receive encrypted notes representing their balance. Every subsequent transfer or withdrawal generates a zk-SNARK proof that validates the inputs without revealing the sender, receiver, or amount.

• Shielding. Depositing tokens converts them to private balance notes. The on-chain event reveals only that tokens entered the pool, not who deposited or how much.
• Private transfers. Send tokens inside the shielded pool without any on-chain trace linking sender to receiver.
• Private DeFi. The RAILGUN Relayer system allows users to call any DeFi contract (Uniswap, Aave, etc.) from inside the shielded pool without exposing their wallet. A relayer broadcasts the transaction for a fee.
• Unshielding. Withdraw tokens back to a standard EVM address. The proof confirms the note was valid without revealing its origin.
• Compliance keys. Optional view keys allow accountants or auditors to read shielded transaction history without accessing spending authority.

The proving key was generated in a public multi-party computation ceremony. No single participant can break the privacy guarantee; all participants would have to collude and none is trusted individually.

Railgun tokenomics and RAIL supply

The total RAIL supply is 100 million tokens. Initial distribution covered team and investors on vesting schedules, a DAO treasury, and community incentives. Governance and fee-share mechanics give RAIL a dual function as both a voting token and a yield-bearing asset.

• Staking yield. RAIL stakers in the governance contract earn a portion of all shield and unshield fees collected across Ethereum, Polygon, BNB Chain, and Arbitrum.
• DAO governance. RAIL holders vote on protocol parameters, new chain deployments, fee rates, and treasury grants.
• Buyback potential. The DAO can vote to use treasury reserves to buy back RAIL from the market, reducing circulating supply.

Supported chains and ecosystem integrations

Railgun smart contracts are deployed on four EVM chains as of 2025: Ethereum mainnet, Polygon, BNB Chain, and Arbitrum. The Railway wallet is the primary interface, available as a browser extension and mobile app for iOS and Android. Third-party integrations include DEX aggregators that route through Railgun's private swap infrastructure.

• Railway wallet. Non-custodial wallet with built-in shielding, private token transfers, and private swaps via 0x and other DEX aggregators.
• WalletConnect support. Any WalletConnect-compatible dApp can be accessed through the Railway wallet in private mode.
• Relayer network. A decentralized set of relayers broadcasts shielded transactions for users who do not want to pay gas from a linked wallet.
• Proof-of-Innocence. An opt-in compliance tool that generates a zero-knowledge proof showing a user's shielded funds are not derived from OFAC-sanctioned addresses, without revealing any balance or history.

How to buy Railgun (RAIL)

RAIL is primarily a DeFi-traded token. Most buyers acquire it on-chain through Uniswap or SushiSwap.

1. Set up an EVM wallet. MetaMask or any WalletConnect wallet works. For maximum privacy, use Railgun's own Railway wallet.
2. Acquire ETH or USDC on Ethereum mainnet or Polygon for lower gas costs.
3. Connect to Uniswap at app.uniswap.org and swap for RAIL on Ethereum. The RAIL/ETH and RAIL/USDC pools are the most liquid.
4. Compare exchange options first. Our exchange ratings page lists centralized venues that may carry RAIL with fiat on-ramp options.
5. Optionally stake RAIL in the governance contract to earn protocol fee revenue. Instructions are at app.railgun.org.

There is no native bridge; RAIL exists on Ethereum as the primary contract. Polygon and other chain deployments are bridged representations.

Railgun vs Tornado Cash: protocol comparison

Railgun is frequently compared to Tornado Cash, the Ethereum mixer sanctioned by OFAC in August 2022. The two systems target overlapping privacy needs but use different designs. See also our Monero page for a non-EVM privacy baseline.

• Architecture. Tornado Cash uses fixed-denomination deposit pools with Merkle proofs. Railgun uses a full UTXO note model that supports arbitrary amounts and native private DeFi calls.
• Sanctions. OFAC sanctioned Tornado Cash smart contract addresses in August 2022. Railgun operates under a different legal posture and added Proof-of-Innocence as a compliance feature.
• DeFi integration. Tornado Cash has no native DeFi routing. Railgun allows private interaction with any EVM DeFi protocol from inside the shielded pool.
• Multi-chain. Tornado Cash was primarily on Ethereum. Railgun is live on Ethereum, Polygon, BNB Chain, and Arbitrum.
• Governance. Tornado Cash had no active governance post-sanction. Railgun has an active RAIL-governed DAO that controls protocol parameters and treasury.

The architectural differences give Railgun a stronger compliance story, but regulatory risk for on-chain privacy infrastructure remains elevated across the board.

Risks of holding Railgun

Regulatory risk is the dominant concern for Railgun, followed by liquidity risk and smart-contract risk.

• Regulatory action. The OFAC sanction of Tornado Cash in 2022 shows that US regulators are willing to target on-chain privacy infrastructure. Railgun's Proof-of-Innocence feature is a mitigation, not immunity.
• Liquidity. RAIL primarily trades in DeFi liquidity pools. A large sell into a thin pool can move price 20-40% without centralized exchange backstop.
• Smart contract risk. Shielded pool contracts are audited but not immune to zero-day exploits. A bug could allow drain of the shielded pool.
• Proof system trust. The initial proving key ceremony is trusted setup. While the multi-party ceremony reduces this risk, it cannot fully eliminate it without a transparent setup.
• Adoption ceiling. Privacy tooling faces friction from on-chain analytics firms, centralized exchange KYC, and user education barriers.
• Drawdown. RAIL has experienced 80%+ drawdowns in bear markets. Position sizing should account for this.

For price trajectory scenarios, see our Railgun price forecast. For context on the privacy coin landscape, our Monero page covers the leading privacy-native asset.

This page is for informational purposes only and does not constitute financial advice. Privacy tools may be restricted in certain jurisdictions. Verify legal status before use.