@anywalletkit/protocol-swap2-balancer
Balancer v2 same-chain swaps as a swap2 module: Smart Order Router paths from
the Balancer API, queryBatchSwap on the Vault for the on-chain quote,
batchSwap execution, on the chains in BALANCER_V2_CHAINS (Vault WETH()
verified before use). Standalone through BalancerSwap2Protocol, or as one
provider of the router.
Install
npm install @anywalletkit/protocol-swap2-balancer @anywalletkit/core
# or: pnpm add @anywalletkit/protocol-swap2-balancer @anywalletkit/core · yarn add @anywalletkit/protocol-swap2-balancer @anywalletkit/core
On npm: @anywalletkit/protocol-swap2-balancer, published from the release workflow with provenance.
Behind remoteProvider
When the provider runs on your server, spread its pins into the app's stub:
remoteProvider({name: "balancer", baseUrl, ...balancerPins}). The engine then lets the EVM route call and
approve only the Balancer V2 Vault, never an address the backend names; without the pins the stub gets no
EVM calldata route (fail closed). The pins carry verifyQuote: balancerVerifyQuote, which opens the Vault call on
the device: only batchSwap of kind GIVEN_IN, no internal balances or pool userData, at most
BALANCER_MAX_SWAPS hops, funds from this account to the recipient, the hops selling exactly the input of the
source token, and limits of exactly the input in and the quote's minimum out. manageUserBalance,
setRelayerApproval, swap and every other Vault call are refused.
Activity
describeActivity(tx, ctx) recognizes batchSwap 0x945bcec9 and swap
0x52bbbe29 on the Vault (0xBA12…2C8, the same address on every chain) on a
chain this module serves, as swap, "Swapped A → B" from the owner's net
transfers (a native value leg included). Subtitle Balancer v2 · <chain>,
counterparty = the Vault.
Fixtures (fixtures/activity/, public Ethereum transactions — the test
wallet's Balancer runs were quote-only on the matrix): Vault swap COW → GNO,
batchSwap BAL → USDT (the call this module builds), batchSwap ETH → WNCG
with native input; negatives: a Uniswap exactInputSingle, a LI.FI swap.