bridge

Create Bridge Swap Transaction

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.

💡 Compute Unit Value: 80 (Fixed)

post/defi/v1/bridge/swap

Request

Base URL
https://svc.blockdaemon.com
URL
https://svc.blockdaemon.com/defi/v1/bridge/swap
Auth
API key in header X-API-Key

Request body

bridgeId'100' | '600' | '300' | '400' | '500'

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

srcTokenSymbolstring

Symbol of the token to swap.

dstChainIdstring required

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

amountInstring 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".

fromstring 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.

amountOutMinstring

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".

gasstring

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.

tostring 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.

dstTokenSymbolstring

Symbol of the token to be received after the swap.

srcChainIdstring required

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

srcChainSymbolstring

Symbol of the source chain.

srcTokenAddressstring

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.

dstTokenAddressstring

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.

slippagestring

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.

gasPrioritystring

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

enableFeeboolean

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

batchOption'EIP-5792' | 'EIP-7702'

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.

batcherContractstring

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.

simulateboolean

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

transferModestring

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.

Example request

{
  "bridgeId": "100",
  "srcTokenSymbol": "usdt",
  "dstChainId": "1",
  "amountIn": "1000000000000000000",
  "from": "0xdAe2F6EdDdA6fb4fb60cc02633DE27e2b431B402",
  "amountOutMin": "0",
  "gas": "100000",
  "to": "0xdAe2F6EdDdA6fb4fb60cc02633DE27e2b431B402",
  "dstTokenSymbol": "ETH",
  "srcChainId": "1",
  "srcChainSymbol": "ETH",
  "srcTokenAddress": "0xdAe2F6EdDdA6fb4fb60cc02633DE27e2b431B402",
  "dstTokenAddress": "0xdAe2F6EdDdA6fb4fb60cc02633DE27e2b431B402",
  "slippage": "10",
  "gasPriority": "low",
  "enableFee": false,
  "batchOption": "EIP-5792",
  "batcherContract": "0x9c933f9d2efd76ce25b0d3dde84d3f94e78a50ca",
  "simulate": false,
  "transferMode": "bus"
}

Response

Successful response

statusnumber

Numeric status code indicating success or failure of the API call

msgstring

Human-readable message describing the API result or error

Example response

{
  "status": 200,
  "msg": "success",
  "data": {
    "chainId": "1",
    "from": "0xa67e9b68c41b0f26184d64c26e0b2b81466e5994",
    "to": "0x8731d54E9D02c286767d56ac03e8037C07e01e98",
    "value": "337237525068648",
    "gas": "10000",
    "data": "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",
    "referenceId": "d1ef36652b6c427e9a96ef4d9e151b09"
  }
}

Changes

No recorded changes to this operation across all 1 revision of this API.