Bifrost Slpx Stake

Execute liquid staking operations on Bifrost SLPx protocol across Ethereum, Base, Optimism, and Arbitrum. Mint vETH by staking ETH/WETH, redeem vETH back to ETH, and claim after redemption completes. Supports manual signing and agent-side signing via ERC-4626 vault. Use when users want to stake, unstake, mint, redeem, or claim ETH on Bifrost DeFi.

Execute Bifrost vETH liquid staking operations: mint, redeem, and claim.

Contract & Network

vETH is deployed on Ethereum and three L2 networks. The same contract address is used across all chains.

Chain	ChainId	VETH Contract	WETH (underlying)	Default RPC	Fallback RPC
Ethereum	1	0xc3997ff81f2831929499c4eE4Ee4e0F08F42D4D8	0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2	https://ethereum.publicnode.com	https://1rpc.io/eth
Base	8453	0xc3997ff81f2831929499c4eE4Ee4e0F08F42D4D8	0x4200000000000000000000000000000000000006	https://base.publicnode.com	https://1rpc.io/base
Optimism	10	0xc3997ff81f2831929499c4eE4Ee4e0F08F42D4D8	0x4200000000000000000000000000000000000006	https://optimism.publicnode.com	https://1rpc.io/op
Arbitrum	42161	0xc3997ff81f2831929499c4eE4Ee4e0F08F42D4D8	0x82aF49447D8a07e3bd95BD0d56f35241523fBab1	https://arbitrum-one.publicnode.com	https://1rpc.io/arb

Configuration

On first run, ask the user whether they want to configure custom settings. If not, use the defaults above.

Environment Variables

Variable	Description	Default
BIFROST_CHAIN	Target chain name (ethereum, base, optimism, arbitrum)	ethereum
BIFROST_RPC_URL	Custom RPC endpoint	Per-chain default from table above
BIFROST_VETH_ADDRESS	VETH contract address (override)	0xc3997ff81f2831929499c4eE4Ee4e0F08F42D4D8
BIFROST_PRIVATE_KEY	Private key for agent-side signing (hex, with or without 0x prefix)	Not set (manual signing mode)

Wallet Setup

Two signing modes. Default is manual signing (no setup needed).

Default: Manual Signing

Output complete transaction details (to, value, data, gas, chainId). User signs with their own wallet (MetaMask, Ledger, CLI, etc.).

Option: Agent-Side Signing

Set BIFROST_PRIVATE_KEY as an environment variable, or import via Foundry keystore:

bash

cast wallet import bifrost-agent --interactive

When BIFROST_PRIVATE_KEY is set, the agent can sign and broadcast transactions directly using cast send.

Quick Reference

Write Operations

Operation	Function	Selector	Description
Mint vETH (via ETH)	depositWithETH()	0x1166dab6	Stake native ETH to mint vETH. ETH is sent as msg.value. The contract wraps ETH → WETH internally — no ERC-20 approval needed. Reverts EthNotSent() if msg.value == 0
Mint vETH (via WETH)	deposit(uint256,address)	0x6e553f65	Deposit WETH directly to mint vETH for receiver. Requires prior WETH approval to the VETH contract
Redeem vETH	redeem(uint256,address,address)	0xba087652	Burn shares of vETH to initiate ETH withdrawal for receiver. ETH enters a redemption queue and is NOT returned instantly. Requires owner == msg.sender or sufficient allowance
Claim as ETH	withdrawCompleteToETH()	0x3ec549e9	Claim ALL completed withdrawals as native ETH. Internally calls withdrawCompleteTo(this) then unwraps WETH → ETH. Reverts EthTransferFailed() if ETH transfer fails
Claim as WETH	withdrawComplete()	0x266a3bce	Claim ALL completed withdrawals as WETH to msg.sender. Use this if withdrawCompleteToETH() fails
Claim to address	withdrawCompleteTo(address)	0xf29ee493	Claim ALL completed withdrawals as WETH to a specified receiver address

Pre-Execution Query Functions

Query	Function	Selector	Description
Preview deposit	previewDeposit(uint256)	0xef8b30f7	Simulate deposit and return exact vETH shares to be minted
Preview redeem	previewRedeem(uint256)	0x4cdad506	Simulate redemption and return exact ETH to be returned
Fallback: shares calc	convertToShares(uint256)	0xc6e6f592	Convert ETH amount to vETH shares using current Oracle exchange rate
Fallback: assets calc	convertToAssets(uint256)	0x07a2d13a	Convert vETH shares to ETH value using current Oracle exchange rate
vETH balance	balanceOf(address)	0x70a08231	Get vETH token balance of a specific address
Max redeemable	maxRedeem(address)	0xd905777e	Maximum vETH shares the owner can redeem in a single tx
Claimable ETH	canWithdrawalAmount(address)	0x52a630b9	Returns (totalAvailableAmount, pendingDeleteIndex, pendingDeleteAmount). First value = ETH ready to claim

How to Call

Read queries — use eth_call (no gas):

bash

# Method A: cast (preferred)
cast call <VETH_CONTRACT> \
  "<FUNCTION_SIGNATURE>(<ARG_TYPES>)(<RETURN_TYPES>)" <ARGS> \
  --rpc-url <RPC_URL>

# Method B: curl (if cast unavailable)
curl -s -X POST <RPC_URL> \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"eth_call","params":[{"to":"<VETH_CONTRACT>","data":"<SELECTOR><ENCODED_ARGS>"},"latest"]}'

If previewDeposit or previewRedeem fails, fall back to convertToShares / convertToAssets (same encoding).

Write transactions — use cast send (requires wallet):

bash

# Mint vETH (stake native ETH)
cast send <VETH_CONTRACT> \
  "depositWithETH()" --value <AMOUNT_IN_WEI> \
  --rpc-url <RPC_URL> --private-key <PRIVATE_KEY>

# Redeem vETH (unstake)
cast send <VETH_CONTRACT> \
  "redeem(uint256,address,address)" <SHARES_IN_WEI> <USER_ADDR> <USER_ADDR> \
  --rpc-url <RPC_URL> --private-key <PRIVATE_KEY>

# Claim ETH (withdraw completed redemptions)
cast send <VETH_CONTRACT> \
  "withdrawCompleteToETH()" \
  --rpc-url <RPC_URL> --private-key <PRIVATE_KEY>

Calldata Encoding (for manual signing output)

• uint256: convert wei to hex, left-pad to 64 chars
• address: remove 0x prefix, left-pad to 64 chars
• canWithdrawalAmount returns 3 × uint256 (192 hex chars): (totalAvailableAmount, pendingDeleteIndex, pendingDeleteAmount). First 64 chars = claimable ETH amount

API 1: Mint vETH (Stake ETH)

Pre-Execution

1. Query rate: previewDeposit(amount) → expected vETH
2. Check wallet: BIFROST_PRIVATE_KEY env var or Foundry keystore bifrost-agent
3. Display preview and wait for CONFIRM

Transaction

Field	Value
To	<VETH_CONTRACT>
Value	User's ETH amount in wei
Data	0x1166dab6
ChainId	Per selected chain

Manual Signing Output

text

To:       <VETH_CONTRACT>
Value:    {wei} ({amount} ETH)
Data:     0x1166dab6
ChainId:  {chainId}

API 2: Redeem vETH (Unstake)

Pre-Execution

1. Check balanceOf(user) ≥ redeem amount
2. Query previewRedeem(shares) → expected ETH
3. Check maxRedeem(user)
4. Display preview (warn: ETH enters queue, NOT instant) and wait for CONFIRM

Transaction

Field	Value
To	<VETH_CONTRACT>
Value	0
Data	ABI-encoded redeem(shares, userAddr, userAddr)
ChainId	Per selected chain

Encode calldata: cast calldata "redeem(uint256,address,address)" <SHARES> <ADDR> <ADDR>

API 3: Claim Redeemed ETH

Pre-Execution

1. Check canWithdrawalAmount(user) — first return value = claimable amount
2. If 0: inform user redemption may still be processing
3. If > 0: display claimable amount and wait for CONFIRM

Transaction

Field	Value
To	<VETH_CONTRACT>
Value	0
Data	0x3ec549e9
ChainId	Per selected chain

Agent Behavior

1. Environment check: on first interaction, ask user if they want to configure BIFROST_CHAIN, BIFROST_RPC_URL, or BIFROST_PRIVATE_KEY. If not, use Ethereum Mainnet defaults with manual signing mode
2. RPC selection: use BIFROST_RPC_URL if set; otherwise use per-chain default RPC. Fall back to per-chain fallback RPC on failure
3. Multi-chain awareness: when user specifies a chain (e.g. "on Base", "on Arbitrum"), switch to that chain's RPC, WETH address, and chainId accordingly
4. Wallet detection: check BIFROST_PRIVATE_KEY env var or Foundry keystore bifrost-agent. If found, ask user whether to use it. If not, output tx data for manual signing
5. CONFIRM required: display transaction preview (amount, rate, expected output, chain) and require user to type CONFIRM before any write
6. Private key import requires CONFIRM: show security warning first, require CONFIRM before accepting key
7. Key retention is user-controlled: after tx, ask user whether to keep or delete the key
8. Balance pre-check: verify sufficient ETH/vETH before building tx
9. Prefer cast, fall back to curl: use pre-computed calldata from selector table if cast fails
10. No credential display: never echo private keys; truncate addresses (first 6 + last 4)
11. Post-completion tip: if no wallet configured, suggest "set up wallet" after operation
12. After successful tx, provide block explorer link: https://etherscan.io/tx/{hash} (Ethereum), https://basescan.org/tx/{hash} (Base), https://optimistic.etherscan.io/tx/{hash} (Optimism), https://arbiscan.io/tx/{hash} (Arbitrum)
13. Useful links: direct users to Bifrost vETH page or Bifrost App when relevant

Security

1. Private keys are opt-in only — default outputs unsigned tx data
2. Explicit CONFIRM for every write operation
3. Validate amounts against balance and protocol limits
4. Recommend dedicated wallet with limited funds for agent-side signing

Error Handling

Error	User Message
EthNotSent() (0x8689d991)	"No ETH included. Please specify the amount."
EthTransferFailed()	"ETH transfer failed. Try claiming as WETH with withdrawComplete()."
ZeroWithdrawAmount() (0xd6d9e665)	"No claimable ETH. Your redemption may still be processing."
ERC4626ExceededMaxRedeem (0xb94abeec)	"Redeem exceeds your maximum. Check balance."
Pausable: paused	"VETH contract is paused. Try again later."
Insufficient ETH	"Insufficient ETH. Balance: {bal}, Needed: {amount + gas}."
Insufficient vETH	"Insufficient vETH. Balance: {bal}, Requested: {amount}."
Max withdraw count exceeded	"Too many pending redemptions. Claim existing ones first."
RPC failure	"Unable to connect. Retrying with backup endpoint..."

Notes

1. depositWithETH() wraps ETH → WETH internally via WETH.deposit(). No ERC-20 approval needed. For direct WETH deposits, use deposit(uint256,address) instead (requires WETH approval)
2. withdrawCompleteToETH() internally calls withdrawCompleteTo(address(this)) to receive WETH, then unwraps to ETH via WETH.withdraw(), then sends ETH to caller. If ETH transfer fails, use withdrawComplete() to receive WETH instead
3. Redemption is NOT instant — redeem() / withdraw() add entries to the withdrawal queue, processed in batches via Bifrost cross-chain mechanism
4. All write functions are protected by whenNotPaused and nonReentrant (ReentrancyGuardUpgradeable)
5. Gas estimates are approximate; use cast estimate for accuracy