Bifrost Slpx Info

Query Bifrost SLPx liquid staking protocol data on Ethereum, Base, Optimism, and Arbitrum. Get vETH/ETH exchange rates, APY, TVL, user balances, redemption queue status, and protocol stats via on-chain ERC-4626 vault calls and Bifrost REST API. Use when users ask about Bifrost staking rates, vETH prices, DeFi yield, or vToken holdings.

Query Bifrost vETH liquid staking data via on-chain calls to the VETH ERC-4626 vault contract.

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 (Environment Variables)

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

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 Backend API

Protocol-level statistics available via the Bifrost REST API (no RPC needed):

text

GET https://api.bifrost.app/api/site

Returns JSON with vETH object containing:

Field	Description
apy	Total APY (Base + Farming), e.g. "8.24"
apyBase	Base staking APY from Ethereum validators, e.g. "3.12"
apyReward	Additional Bifrost farming reward APY, e.g. "5.12"
tvl	Total value locked in USD
tvm	Total vETH minted (in ETH)
totalIssuance	Total vETH supply (on Bifrost chain)
holders	Number of vETH holders across all chains

Use this API when users ask about APY, yield, TVL, or holder count.

Quick Reference

VETH is an ERC-4626 vault inheriting from VToken → VTokenBase → ERC4626Upgradeable. All standard ERC-4626 view functions are available. Exchange rates are Oracle-backed.

Token Info

Query	Function	Selector	Args	Returns	Description
Token name	name()	0x06fdde03	none	string	Returns "Bifrost Voucher ETH"
Token symbol	symbol()	0x95d89b41	none	string	Returns "vETH"
Decimals	decimals()	0x313ce567	none	uint8	Returns 18
Underlying asset	asset()	0x38d52e0f	none	address	Returns the WETH address (differs per chain, see Contract & Network table)

Exchange Rate Queries

Query	Function	Selector	Args	Returns	Description
ETH → vETH rate	convertToShares(uint256)	0xc6e6f592	assets (wei)	uint256 (shares)	Convert an ETH amount to the equivalent vETH shares using the current Oracle exchange rate
vETH → ETH rate	convertToAssets(uint256)	0x07a2d13a	shares (wei)	uint256 (assets)	Convert a vETH shares amount to the equivalent ETH value using the current Oracle exchange rate
Preview deposit	previewDeposit(uint256)	0xef8b30f7	assets (wei)	uint256 (shares)	Simulate a deposit and return the exact vETH shares that would be minted
Preview mint	previewMint(uint256)	0xb3d7f6b9	shares (wei)	uint256 (assets)	Simulate minting a specific amount of vETH shares and return the ETH required
Preview withdraw	previewWithdraw(uint256)	0x0a28a477	assets (wei)	uint256 (shares)	Simulate withdrawing a specific ETH amount and return the vETH shares that would be burned
Preview redeem	previewRedeem(uint256)	0x4cdad506	shares (wei)	uint256 (assets)	Simulate a redemption and return the exact ETH that would be returned

User Balance & Withdrawal Queries

Query	Function	Selector	Args	Returns	Description
vETH balance	balanceOf(address)	0x70a08231	owner address	uint256	Get the vETH token balance of a specific address
Claimable ETH	canWithdrawalAmount(address)	0x52a630b9	target address	(uint256, uint256, uint256)	Returns (totalAvailableAmount, pendingDeleteIndex, pendingDeleteAmount). First value = ETH ready to claim
Withdrawal queue	getWithdrawals(address)	0x3a2b643a	target address	Withdrawal[]	Returns array of withdrawal entries, each with queued (amount in queue) and pending (amount being processed) fields
Max redeemable	maxRedeem(address)	0xd905777e	owner address	uint256	Maximum vETH shares the owner can redeem in a single tx
Max withdrawable	maxWithdraw(address)	0xce96cb77	owner address	uint256	Maximum ETH the owner can withdraw in a single tx
Max depositable	maxDeposit(address)	0x402d267d	receiver address	uint256	Maximum ETH that can be deposited for receiver (typically type(uint256).max = unlimited)
Max mintable	maxMint(address)	0xc63d75b6	receiver address	uint256	Maximum vETH shares that can be minted for receiver (typically type(uint256).max = unlimited)
Allowance	allowance(address,address)	0xdd62ed3e	owner, spender	uint256	Check vETH spending allowance granted by owner to spender

Protocol Statistics

Query	Function	Selector	Args	Returns	Description
Total assets	totalAssets()	0x01e1d114	none	uint256	Total ETH managed by the vault, sourced from Oracle poolInfo(asset)
Total supply	totalSupply()	0x18160ddd	none	uint256	Total vETH tokens in circulation on this chain
Vault balance	getTotalBalance()	0x12b58349	none	uint256	ETH available for payouts (BridgeVault balance + completed withdrawals)
Queued withdrawals	queuedWithdrawal()	0x996e5c06	none	uint256	Total ETH amount currently queued for withdrawal globally
Completed withdrawals	completedWithdrawal()	0x63ea1b92	none	uint256	Total ETH amount that has completed withdrawal processing globally
Max withdraw count	maxWithdrawCount()	0xdc692cd7	none	uint256	Maximum number of concurrent pending withdrawal entries per user
Paused	paused()	0x5c975abb	none	bool	Whether the contract is currently paused (deposits/redeems disabled)

How to Call

All queries are read-only eth_call — no gas, no signing.

Method A: cast (preferred)

bash

cast call <VETH_CONTRACT> \
  "<FUNCTION_SIGNATURE>(<ARG_TYPES>)(<RETURN_TYPES>)" <ARGS> \
  --rpc-url <RPC_URL>

Example — query exchange rate for 1 ETH on Ethereum:

bash

cast call 0xc3997ff81f2831929499c4eE4Ee4e0F08F42D4D8 \
  "convertToShares(uint256)(uint256)" 1000000000000000000 \
  --rpc-url https://ethereum.publicnode.com

Method B: curl + JSON-RPC (if cast unavailable)

bash

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"]}'

Calldata Encoding

• No-arg functions: calldata = selector only (e.g., 0x01e1d114 for totalAssets())
• uint256 arg: selector + amount in hex, left-padded to 64 chars
  • Example: 1 ETH = 0xDE0B6B3A7640000 → pad to 0000000000000000000000000000000000000000000000000de0b6b3a7640000
• address arg: selector + address (no 0x), left-padded to 64 chars
  • Example: 0xAbCd...1234 → 000000000000000000000000AbCd...1234

Response Decoding

• curl returns {"result":"0x<hex>"}. For single uint256: convert 64 hex chars to decimal, divide by 1e18.
• canWithdrawalAmount returns 3 × uint256 (192 hex chars): (totalAvailableAmount, pendingDeleteIndex, pendingDeleteAmount). First 64 chars = claimable ETH amount.

Agent Behavior

1. Environment check: on first interaction, ask user if they want to configure BIFROST_CHAIN or BIFROST_RPC_URL. If not, use Ethereum Mainnet defaults
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 and WETH address accordingly
4. All values are in wei (18 decimals) — always convert to human-readable before displaying
5. Default exchange rate query: show rate for 1 ETH if no amount specified
6. Prompt for wallet address if not provided; display truncated (first 6 + last 4 chars)
7. If canWithdrawalAmount first value > 0, indicate claimable and suggest "claim my redeemed ETH"
8. Prefer cast call; fall back to curl + JSON-RPC with pre-computed calldata if cast fails
9. Always fetch fresh data — do not cache across requests
10. If RPC fails, retry with fallback before reporting error
11. Useful links: direct users to Bifrost vETH page or Bifrost App when relevant

Error Handling

Error	User Message
RPC failure	"Unable to connect to Ethereum. Retrying with backup endpoint..."
Zero from convertToShares	"The vETH exchange rate is temporarily unavailable. The contract may be paused."
Empty withdrawal array	"You have no pending vETH redemptions."
Invalid address	"Please provide a valid Ethereum address (0x + 40 hex characters)."
execution reverted	Retry with alternate method (cast ↔ curl). If both fail, report to user.

Notes

1. VETH inherits VToken → VTokenBase → ERC4626Upgradeable / OwnableUpgradeable / PausableUpgradeable. All standard ERC-4626 view functions work
2. Exchange rates are Oracle-backed via oracle.poolInfo(asset) — may lag slightly vs. actual staking rewards
3. getWithdrawals returns Withdrawal[] where each entry has queued (amount waiting in queue) and pending (amount being processed by Bifrost)
4. The same VETH contract address is deployed on Ethereum, Base, Optimism, and Arbitrum — but WETH (underlying asset) addresses differ per chain
5. totalAssets() reflects the global pool size from Oracle, while totalSupply() is per-chain vETH circulation
6. getTotalBalance() = BridgeVault balance + completed withdrawals — represents ETH available for immediate payouts