SDK API Reference - Berachain

The SDK API Reference is a comprehensive guide to the Berancer SDK’s API. It includes all the functions and classes available in the SDK, as well as their parameters and return values.

API initialization

The BalancerApi class provides helper functions for interacting with the Berancer API.

Constructor

const balancerApi = new BalancerApi(apiUrl: string, chainId: ChainId);

Name	Type	Description	Mainnet Value
apiUrl	string	Url of API	`https://chgbtcc9ffu7rbdw2kmu4urwy.stellate.sh/`
chainId	number	Chain that will be queried	`80094`

Properties

The BalancerApi class initializes the following properties:

Pools - Methods for interacting with individual pools
NestedPools - Methods for working with nested pools
SorSwapPaths - Methods for optimizing swap paths

Pools

pools.fetchPoolState

Finds state of given pool.

pools.fetchPoolState(id: string): Promise<PoolState>

Parameters

Name	Type	Description
id	string	ID of pool, v2=poolId, v3=address

Returns

Promise<PoolState>;

PoolState - State of given pool.

pools.fetchPoolStateWithBalances

Finds state of given pool including token balances and pool shares.

fetchPoolStateWithBalances(
  id: string,
): Promise<PoolStateWithBalances>

Parameters

Name	Type	Description
id	string	poolId

Returns

Promise<PoolStateWithBalances>;

PoolStateWithBalances - State of given pool including token balances and pool shares.

Nested pools

nestedPools.fetchPoolState

Finds state of a set of nested pools.

fetchNestedPoolState(id: string): Promise<NestedPoolState>

Parameters

Name	Type	Description
id	string	ID of pool, v2=poolId, v3=address

Returns

Promise<NestedPoolState>;

NestedPoolState - state of a set of nested pools.

SorSwapPaths

sorSwapPaths.fetchSorSwapPaths

Finds optimized swap paths for a given swap config.

fetchSorSwapPaths(sorInput: SorInput): Promise<Path[]>

Parameters

Name	Type	Description
sorInput	SorInput	Swap configs

Returns

Promise<Path[]>;

Path[] - optimized swap paths for the given swap.

AddLiquidity

This class provides functionality to:

Perform on-chain queries to see the result of an addLiquidity operation
Build an addLiquidity transaction, with slippage, for a consumer to submit
Supported add types: SingleToken, Unbalanced, Proportional

Constructor

const addLiquidity = new AddLiquidity();

Methods

query

Simulate addLiquidity operation by using an onchain call.

query(
  input: AddLiquidityInput,
  poolState: PoolState
): Promise<AddLiquidityQueryOutput>

Parameters

Name	Type	Description
input	AddLiquidityInput	User defined inputs
poolState	PoolState	Current state of pool that liquidity is being added to

Returns

Promise<AddLiquidityQueryOutput>;

AddLiquidityQueryOutput - Data that can be passed to buildCall. Includes updated bptOut amount.

buildCall

Builds the addLiquidity transaction using user defined slippage.

buildCall(input: AddLiquidityBuildCallInput): AddLiquidityBuildCallOutput

Parameters

Name	Type	Description
input	AddLiquidityBuildCallInput	Parameters required to build the call including user defined slippage

Returns

AddLiquidityBuildCallOutput;

AddLiquidityBuildCallOutput - Encoded call data for addLiquidity that the user can submit.

buildCallWithPermit2

Builds the addLiquidity transaction using user defined slippage and Permit2 signature for token approval.

Check out the Permit2 Helper section on how to generate a Permit2 signature.

buildCallWithPermit2(input: AddLiquidityBuildCallInput, permit2: Permit2): AddLiquidityBuildCallOutput

Parameters

Name	Type	Description
input	AddLiquidityBuildCallInput	Parameters required to build the call including user defined slippage
permit2	Permit2	Permit2 object with metadata and encoded signature

Returns

AddLiquidityBuildCallOutput;

AddLiquidityBuildCallOutput - Encoded call data for addLiquidity that the user can submit.

RemoveLiquidity

This class provides functionality to:

Perform on-chain queries to see the result of a removeLiquidity operation
Build a removeLiquidity transaction, with slippage, for a consumer to submit
Supported remove types: Unbalanced, SingleTokenExactOutInput, SingleTokenExactInInput, Proportional

Constructor

const removeLiquidity = new RemoveLiquidity();

Methods

query

Simulate removeLiquidity operation by using an onchain call.

query(
  input: RemoveLiquidityInput,
  poolState: PoolState,
): Promise<RemoveLiquidityQueryOutput>

Parameters

Name	Type	Description
input	RemoveLiquidityInput	User defined inputs
poolState	PoolState	Current state of pool that liquidity is being removed from

Returns

Promise<RemoveLiquidityQueryOutput>;

RemoveLiquidityQueryOutput - Data that can be passed to buildCall. Includes updated amountsOut amount.

queryRemoveLiquidityRecovery

Calculates proportional exit using pool state. Note - this does not do an onchain query.

queryRemoveLiquidityRecovery(
  input: RemoveLiquidityRecoveryInput,
  poolState: PoolState,
): Promise<RemoveLiquidityQueryOutput>

Parameters

Name	Type	Description
input	RemoveLiquidityRecoveryInput	User defined inputs
poolState	PoolState	Current state of pool that liquidity is being removed from

Returns

Promise<RemoveLiquidityQueryOutput>;

RemoveLiquidityQueryOutput - Data that can be passed to buildCall. Includes updated amountsOut amount.

buildCall

Builds the removeLiquidity transaction using user defined slippage.

buildCall(
  input: RemoveLiquidityBuildCallInput,
): RemoveLiquidityBuildCallOutput

Parameters

Name	Type	Description
input	RemoveLiquidityBuildCallInput	Input with user defined slippage

Returns

RemoveLiquidityBuildCallOutput;

RemoveLiquidityBuildCallOutput - Encoded call data for removeLiquidity that the user can submit.

buildCallWithPermit

Builds the removeLiquidity transaction using user defined slippage and Permit signature for token approval.

Check out the Permit Helper section on how to generate a Permit signature.

buildCallWithPermit(
  input: RemoveLiquidityBuildCallInput,
  permit: Permit,
): RemoveLiquidityBuildCallOutput

Parameters

Name	Type	Description
input	RemoveLiquidityBuildCallInput	Input with user defined slippage
permit	Permit	Permit object with metadata and encoded signature

Returns

RemoveLiquidityBuildCallOutput;

RemoveLiquidityBuildCallOutput - Encoded call data for removeLiquidity that the user can submit.

Swap

This class provides functionality to:

Perform on-chain queries to see the result of a Swap operation
Build a Swap transaction, with slippage, for a consumer to submit

Constructor

const swap = new Swap(swapInput: SwapInput);

Name	Type	Description
swapInput	SwapInput	Swap input including path information.

Note: SwapInput data is normally returned from an API SOR query but may be constructed manually.

Methods

query

Gets up to date swap result by querying onchain.

query(
  rpcUrl?: string,
  block?: bigint,
): Promise<ExactInQueryOutput | ExactOutQueryOutput>

Parameters

Name	Type	Description
rpcUrl (optional)	string	RPC URL, e.g. Infura/Alchemy
block (optional)	bigint	Block no to perform the query

Returns

Promise<ExactInQueryOutput | ExactOutQueryOutput>;

ExactInQueryOutput | ExactOutQueryOutput The updated return for the given swap, either expectedAmountOut or expectedAmountIn depending on swap kind.

buildCall

Builds the swap transaction using user defined slippage.

buildCall(
  input: SwapBuildCallInput,
): SwapBuildOutputExactIn | SwapBuildOutputExactOut

Parameters

Name	Type	Description
input	SwapBuildCallInput	Input with user defined slippage

Returns

SwapBuildOutputExactIn | SwapBuildOutputExactOut;

SwapBuildOutputExactIn | SwapBuildOutputExactOut - Encoded call data for swap that the user can submit. Includes minAmountOut or maxAmountIn depending on swap kind.

buildCallWithPermit2

Builds the swap transaction using user defined slippage and Permit2 signature for token approval.

Check out the Permit2 Helper section on how to generate a Permit2 signature.

buildCallWithPermit2(
  input: SwapBuildCallInput,
  permit2: Permit2,
): SwapBuildOutputExactIn | SwapBuildOutputExactOut

Parameters

Name	Type	Description
input	SwapBuildCallInput	Input with user defined slippage
permit2	Permit2	Permit2 object with metadata and encoded signature

Returns

SwapBuildOutputExactIn | SwapBuildOutputExactOut;

SwapBuildOutputExactIn | SwapBuildOutputExactOut - Encoded call data for swap that the user can submit. Includes minAmountOut or maxAmountIn depending on swap kind.

quote

Gives the combined return amount for all paths. Note - this always uses the original path amounts provided in constructor and does not get updated.

public get quote(): TokenAmount

Returns

TokenAmount;

TokenAmount - Gives the combined return amount for all paths (output amount for givenIn, input amount for givenOut).

inputAmount

public get inputAmount(): TokenAmount

Returns

TokenAmount;

TokenAmount - Gives the combined input amount for all paths.

outputAmount

public get outputAmount(): TokenAmount

Returns

TokenAmount;

TokenAmount - Gives the combined output amount for all paths.

queryCallData

public queryCallData(): string

Returns

string;

Encoded query data for swap that you can call to get an updated amount.

PriceImpact

This class provides helper functions to calculate Price Impact for add/remove/swap actions.

Methods

addLiquiditySingleToken

Calculate price impact on add liquidity single token operations.

addLiquiditySingleToken(
  input: AddLiquiditySingleTokenInput,
  poolState: PoolState,
): Promise<PriceImpactAmount>

Parameters

Name	Type	Description
input	AddLiquiditySingleTokenInput	Same input used in the corresponding add liquidity operation
poolState	PoolState	Current state of pool that liquidity is being added to

Returns

Promise<PriceImpactAmount>;

PriceImpactAmount - Price impact for operation.

addLiquidityUnbalanced

Calculate price impact on add liquidity unbalanced operations.

addLiquidityUnbalanced = async (
    input: AddLiquidityUnbalancedInput,
    poolState: PoolState,
): Promise<PriceImpactAmount>

Parameters

Name	Type	Description
input	AddLiquidityUnbalancedInput	Same input used in the corresponding add liquidity operation
poolState	PoolState	Current state of pool that liquidity is being added to

Returns

Promise<PriceImpactAmount>;

PriceImpactAmount - Price impact for operation.

addLiquidityNested

Calculate price impact on add liquidity nested token operations.

addLiquidityNested = async (
  input: AddLiquidityNestedInput,
  nestedPoolState: NestedPoolState,
): Promise<PriceImpactAmount>

Parameters

Name	Type	Description
input	AddLiquidityNestedInput	Same input used in the corresponding add liquidity operation
nestedPoolState	NestedPoolState	Current state of nested pools

Returns

Promise<PriceImpactAmount>;

PriceImpactAmount - Price impact for operation.

removeLiquidity

Calculate price impact on remove liquidity operations.

removeLiquidity = async (
  input:
      | RemoveLiquiditySingleTokenExactInInput
      | RemoveLiquidityUnbalancedInput,
  poolState: PoolState,
): Promise<PriceImpactAmount>

Parameters

Name	Type	Description
input	RemoveLiquiditySingleTokenExactInInput	Same input used in the corresponding remove liquidity operation
input	RemoveLiquidityUnbalancedInput	Same input used in the corresponding remove liquidity operation
poolState	PoolState	Current state of pool that liquidity is being removed from

Returns

Promise<PriceImpactAmount>;

PriceImpactAmount - Price impact for operation.

removeLiquidityNested

Calculate price impact on remove liquidity single token nested operations.

removeLiquidityNested = async (
  input: RemoveLiquidityNestedSingleTokenInput,
  nestedPoolState: NestedPoolState,
): Promise<PriceImpactAmount>

Parameters

Name	Type	Description
input	RemoveLiquidityNestedSingleTokenInput	Same input used in the corresponding remove liquidity operation
nestedPoolState	NestedPoolState	Current state of nested pools

Returns

Promise<PriceImpactAmount>;

PriceImpactAmount - Price impact for operation.

swap

Calculate price impact on swap operations.

swap = async (
  swapInput: SwapInput,
  rpcUrl?: string,
  block?: bigint,
): Promise<PriceImpactAmount>

Parameters

Name	Type	Description
swapInput	SwapInput	Swap input including path information.
rpcUrl (optional)	string	RPC URL, e.g. Infura/Alchemy
block (optional)	bigint	Block no to perform the query

Note: SwapInput data is normally returned from an API SOR query but may be constructed manually. Returns

Promise<PriceImpactAmount>;

PriceImpactAmount - Price impact for operation.

Utils

Helper functions.

calculateProportionalAmounts

Given pool balances (including BPT) and a reference token amount, it calculates all other amounts proportional to the reference amount.

calculateProportionalAmounts(
  pool: {
    address: Address;
    totalShares: HumanAmount;
    tokens: {
      address: Address;
      balance: HumanAmount;
      decimals: number
    }[];
  },
  referenceAmount: InputAmount,
): {
  tokenAmounts: InputAmount[];
  bptAmount: InputAmount;
}

Parameters

Name	Type	Description
pool	See above	Pool state
referenceAmount	InputAmount	Ref token amount

Returns

{
  tokenAmounts: InputAmount[];
  bptAmount: InputAmount;
}

Amounts proportional to the reference amount.

Permit2 helper

Balancer v3 handles token approval through Permit2 and this helper facilitates Permit2 signature generation. Each operation (i.e. addLiquidity, addLiquidityNested, addLiquidityBoosted and swap) has its own method that leverages the same input type of the operation itself in order to simplify signature generation. Function

static async signAddLiquidityApproval(
    input: AddLiquidityBaseBuildCallInput & {
        client: PublicWalletClient;
        owner: Address;
        nonces?: number[];
        expirations?: number[];
    },
): Promise<Permit2>

Parameters

Name	Type	Description
input	AddLiquidityBaseBuildCallInput	Add Liquidity Input
client	PublicWalletClient	Viem’s wallet client with public actions
owner	Address	User address
nonces (optional)	number[]	Nonces for each token
expirations (optional)	number[]	Expirations for each token

Returns

Promise<Permit2>;

Permit2 - Permit2 object with metadata and encoded signature

Permit helper

Balancer v3 conforms with EIP-2612 and this helper facilitates Permit signature generation. Each operation (i.e. removeLiquidity, removeLiquidityNested and removeLiquidityBoosted) has its own method that leverages the same input type of the operation itself in order to simplify signature generation. Function

static signRemoveLiquidityApproval = async (
    input: RemoveLiquidityBaseBuildCallInput & {
        client: PublicWalletClient;
        owner: Hex;
        nonce?: bigint;
        deadline?: bigint;
    },
): Promise<Permit>

Parameters

Name	Type	Description
input	RemoveLiquidityBaseBuildCallInput	Remove Liquidity Input
client	PublicWalletClient	Viem’s wallet client with public actions
owner	Address	User address
nonces (optional)	number[]	Nonces for each token
expirations (optional)	number[]	Expirations for each token

Returns

Promise<Permit>;

Permit - Permit object with metadata and encoded signature

Overview

Getting Started

General Guides

BEX

Bend

​API initialization

​Constructor

​Properties

​Pools

​pools.fetchPoolState

​pools.fetchPoolStateWithBalances

​Nested pools

​nestedPools.fetchPoolState

​SorSwapPaths

​sorSwapPaths.fetchSorSwapPaths

​AddLiquidity

​Constructor

​Methods

​query

​buildCall

​buildCallWithPermit2

​RemoveLiquidity

​Constructor

​Methods

​query

​queryRemoveLiquidityRecovery

​buildCall

​buildCallWithPermit

​Swap

​Constructor

​Methods

​query

​buildCall

​buildCallWithPermit2

​quote

​inputAmount

​outputAmount

​queryCallData

​PriceImpact

​Methods

​addLiquiditySingleToken

​addLiquidityUnbalanced

​addLiquidityNested

​removeLiquidity

​removeLiquidityNested

​swap

​Utils

​calculateProportionalAmounts

​Permit2 helper

​Permit helper

API initialization

Constructor

Properties

Pools

pools.fetchPoolState

pools.fetchPoolStateWithBalances

Nested pools

nestedPools.fetchPoolState

SorSwapPaths

sorSwapPaths.fetchSorSwapPaths

AddLiquidity

Constructor

Methods

query

buildCall

buildCallWithPermit2

RemoveLiquidity

Constructor

Methods

query

queryRemoveLiquidityRecovery

buildCall

buildCallWithPermit

Swap

Constructor

Methods

query

buildCall

buildCallWithPermit2

quote

inputAmount

outputAmount

queryCallData

PriceImpact

Methods

addLiquiditySingleToken

addLiquidityUnbalanced

addLiquidityNested

removeLiquidity

removeLiquidityNested

swap

Utils

calculateProportionalAmounts

Permit2 helper

Permit helper