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POST
/
v1
/
buildTx
curl -X POST https://zap.dzap.io/v1/buildTx \
  -H "Content-Type: application/json" \
  -d '{ "srcToken": "...", "srcChainId": 8453, ... }'

{
  "status": "success",
  "data": {
    "to": "0x1d46863e3592745008b5CbbAC12014F67329A9b8",
    "data": "0x...",
    "value": "0",
    "gasLimit": "350000",
    "txId": "0xabc..."
  }
}
Takes a quote (or the same params you passed to /v1/quote) and returns transaction data ready to sign and submit.

​
Body

​
srcToken
string
required
​
srcChainId
integer
required
​
destToken
string
required
​
destChainId
integer
required
​
amount
string
required
Amount in wei.
​
recipient
string
required
​
refundee
string
required
Address to refund if cross-chain settlement fails.
​
slippage
number
required
​
account
string
required
​
permit
string
Permit2 / EIP-2612 signature payload, if you signed one.

​
Response

​
status
string
​
data.to
string
Contract to call.
​
data.data
string
Hex-encoded calldata.
​
data.value
string
Native value to send (for native-token swaps).
​
data.gasLimit
string
Suggested gas limit.
​
data.txId
string
Bind for status polling.

​
Examples

curl -X POST https://zap.dzap.io/v1/buildTx \
  -H "Content-Type: application/json" \
  -d '{ "srcToken": "...", "srcChainId": 8453, ... }'

{
  "status": "success",
  "data": {
    "to": "0x1d46863e3592745008b5CbbAC12014F67329A9b8",
    "data": "0x...",
    "value": "0",
    "gasLimit": "350000",
    "txId": "0xabc..."
  }
}
Use the txId to poll /v1/status until the (possibly cross-chain) settlement completes.
Last modified on May 4, 2026