Create Bridge Swap Transaction

post

https://svc.blockdaemon.com/defi/v1/bridge/swap

Enables seamless, cross-chain token exchanges by swapping assets between supported blockchain networks. This endpoint processes the swap transaction securely and efficiently, converting tokens from one chain to another while managing the necessary transaction parameters. The response provides key details—including source and destination chain IDs, sender and receiver addresses, transferred value, gas specifications, and a unique reference ID—allowing developers and users to verify and track the swap transaction.

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Compute Unit Value: 80 (Fixed)

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Body Params

The request body for a /defi/v1/bridge/swap

bridgeId

string

enum

The unique ID to specify the bridge protocol for routing cross-chain queries or transactions. Find more here.

Allowed:

srcTokenSymbol

string

Symbol of the token to swap.

dstChainId

string

required

The unique chain ID to specify the destination chain. Find more here.

amountIn

string

required

Amount of the input token to provide, specified in the token's smallest denomination (base units). Do not send human-readable decimal values. Examples: to swap 1 WETH (18 decimals), use "1000000000000000000"; to swap 1 USDC (6 decimals), use "1000000".

from

string

required

Blockchain address of the token sender. For EVM chains, use a checksummed hex address (e.g., 0xABCDEF...). This address must hold sufficient balance of the input token and will sign the transaction.

amountOutMin

string

Minimum acceptable output amount in the token's smallest denomination (base units). Provides slippage protection — the transaction reverts if the output falls below this value. Set to "0" to disable slippage protection. Examples: to require at least 0.99 USDC (6 decimals), use "990000"; to require at least 0.99 WETH (18 decimals), use "990000000000000000".

gas

string

Maximum number of gas units to allocate for the transaction, as an integer string (e.g., '200000'). If omitted, gas is estimated automatically. Note: this is gas units, not wei or gwei.

string

required

Blockchain address of the token recipient. For EVM chains, use a checksummed hex address (e.g., 0xABCDEF...). Output tokens are delivered to this address after the swap.

dstTokenSymbol

string

Symbol of the token to be received after the swap.

srcChainId

string

required

The unique chain ID to specify the source chain. Find more here.

srcChainSymbol

string

Symbol of the source chain.

srcTokenAddress

string

Contract address of the source (input) token on the source chain. For EVM chains, use a checksummed hex address (e.g., 0x...). Either srcTokenAddress or srcTokenSymbol must be provided.

dstTokenAddress

string

Contract address of the destination (output) token on the destination chain. For EVM chains, use a checksummed hex address (e.g., 0x...). Either dstTokenAddress or dstTokenSymbol must be provided.

slippage

string

Maximum acceptable slippage as a percentage of the swap value. Valid range: 0 to 100 (e.g., 1 = up to 1% slippage). Defaults to 1. The transaction reverts if the output deviates more than this percentage from the quoted price.

gasPriority

string

Specifies the priority level for gas fees (e.g., 'low', 'medium', or 'high'), which influences the transaction speed and cost.

enableFee

boolean

Flag to include a basis points fee transaction alongside the main transaction when set to true.

batchOption

string

enum

Transaction batching standard to use. Supported values: 'EIP-5792' (wallet-level batching via wallet_sendCalls) or 'EIP-7702' (EOA code delegation via batcherContract). Requires batcherContract when using EIP-7702.

Allowed:

batcherContract

string

The EOA address of the batcher that will be used to execute the transaction when using EIP-7702 batching. If not provided, the default batcher contract for the chain will be used.

simulate

boolean

When true, dry-runs the transaction batch via eth_simulateV1 and returns a simulate field with status and error on each transaction.

transferMode

string

Specifies the mode of token transfer. The first is taxi, where tokens are sent to the destination chain at the moment of swap. The second is bus ride. Bus ride means that multiple user swaps are batched together.

Response

Language

Credentials

Header

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Response

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application/json

200Successful response