Balancer V2 Pools

Reports an account's wallet-held (unstaked) Balancer V2 pool liquidity across any pool.

Reports an account's wallet-held (unstaked) Balancer V2 pool liquidity across any pool. It decomposes the account's BPT balance pro-rata into the pool's underlying tokens by reading the Balancer V2 Vault's live balances — the AMM-supplied LP only. Gauge-staked LP and rewards are the separate Balancer V2 Gauges adapter.

• Type: Meta-adapter
• protocolSubId: keccak256("balancer-v2-pools")
• Instance key: the pool's raw bytes32 poolId (used directly, not an address). The BPT (ERC20) address is the top 160 bits of the poolId.
• Source: BalancerV2PoolsMetaBalanceAdapter.sol

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Positions returned

One leg per registered underlying pool token with a non-zero share:

Leg	PositionKind	isDebt	Description
Supply	Supplied	false	Pro-rata share of one underlying pool token, from the account's wallet BPT

The pool's own pre-minted BPT (composable-stable pools) is excluded from the token list. Unregistered, zero-amount, and asset-filtered tokens are skipped.

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Balance calculation

Balancer V2 Pools adapter — how the underlying balances reported to the NAV Calculator are derived.

Balancer V2 holds every pool's tokens in a single Vault. For BPT balance walletBpt = BPT.balanceOf(account) (returns nothing if zero), BalancerV2PoolLib.shares reads the Vault's getPoolTokens(poolId) balances and computes each token's pro-rata amount:

amount[i] = balances[i] * walletBpt / effectiveSupply

effectiveSupply is getActualSupply() when the pool exposes it (composable-stable: excludes pre-minted BPT, includes due protocol fees) and falls back to totalSupply() for legacy weighted/stable pools.

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Identity

• positionId: abi.encode(bytes32 poolId)
• positionKind: Supplied

There is no labels field on the position. The adapter implements positionLabels(positionId), which returns ["AMM Liquidity Pool", "<sym0>/<sym1>/…"] from the pool's underlying token symbols — surfaced only by the verbose reads (getAccountPositionsVerbose / getAccountNavVerbose); the full breadcrumb is [protocolName, ...labels].

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Constructor

constructor(address vault_, address navCalculator_)

Parameter	Description
vault_	Balancer V2 Vault address (must be a contract); the chain-level singleton that custodies every pool's tokens
navCalculator_	NAVCalculator address (must be a contract); source of the asset registry and the instance set

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Registration

Registered as a meta-adapter via addMetaBalanceAdapter(adapter, instances), with the instance set adjusted by addMetaInstances / removeMetaInstances. Instance coordinates are passed as bytes32 and stored as-is — for Balancer V2 each coordinate is the raw bytes32 poolId (not an address widened to bytes32, as most meta-adapters use). The adapter recovers the BPT from the poolId's top 160 bits when it needs the ERC-20.