Build User Steps

Build transaction steps

curl --request POST \
  --url https://transfer.layerzero-api.com/v1/build-user-steps \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "quoteId": "quote_abc123"
}
'

import requests

url = "https://transfer.layerzero-api.com/v1/build-user-steps"

payload = { "quoteId": "quote_abc123" }
headers = {
    "x-api-key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({quoteId: 'quote_abc123'})
};

fetch('https://transfer.layerzero-api.com/v1/build-user-steps', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://transfer.layerzero-api.com/v1/build-user-steps",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'quoteId' => 'quote_abc123'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "x-api-key: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://transfer.layerzero-api.com/v1/build-user-steps"

	payload := strings.NewReader("{\n  \"quoteId\": \"quote_abc123\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("x-api-key", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://transfer.layerzero-api.com/v1/build-user-steps")
  .header("x-api-key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"quoteId\": \"quote_abc123\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://transfer.layerzero-api.com/v1/build-user-steps")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["x-api-key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"quoteId\": \"quote_abc123\"\n}"

response = http.request(request)
puts response.read_body

{
  "userSteps": [
    {
      "type": "TRANSACTION",
      "description": "bridge",
      "chainKey": "solana",
      "chainType": "SOLANA",
      "signerAddress": "Dz93pUVjXuaMnSsPSn7V99V4cUzhKoQdx9ECwZJZiafG"
    }
  ]
}

POST

build-user-steps

Build transaction steps

curl --request POST \
  --url https://transfer.layerzero-api.com/v1/build-user-steps \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "quoteId": "quote_abc123"
}
'

import requests

url = "https://transfer.layerzero-api.com/v1/build-user-steps"

payload = { "quoteId": "quote_abc123" }
headers = {
    "x-api-key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({quoteId: 'quote_abc123'})
};

fetch('https://transfer.layerzero-api.com/v1/build-user-steps', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://transfer.layerzero-api.com/v1/build-user-steps",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'quoteId' => 'quote_abc123'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "x-api-key: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://transfer.layerzero-api.com/v1/build-user-steps"

	payload := strings.NewReader("{\n  \"quoteId\": \"quote_abc123\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("x-api-key", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://transfer.layerzero-api.com/v1/build-user-steps")
  .header("x-api-key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"quoteId\": \"quote_abc123\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://transfer.layerzero-api.com/v1/build-user-steps")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["x-api-key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"quoteId\": \"quote_abc123\"\n}"

response = http.request(request)
puts response.read_body

{
  "userSteps": [
    {
      "type": "TRANSACTION",
      "description": "bridge",
      "chainKey": "solana",
      "chainType": "SOLANA",
      "signerAddress": "Dz93pUVjXuaMnSsPSn7V99V4cUzhKoQdx9ECwZJZiafG"
    }
  ]
}

Generates fresh transaction data for a quote. Required for Solana transfers due to short blockhash validity.

Reference

When to use

Chain type	When to call
EVM	Not required. Use `userSteps` directly from quote response.
Solana	Always required. Solana transactions have short blockhash validity (~60 seconds). Call this endpoint immediately before execution.

Request body

Parameter	Type	Required	Description
`quoteId`	string	Yes	Quote ID from the `/quotes` response

Response

Returns a userSteps array with fresh transaction data.

User step attributes

User steps can be TRANSACTION or SIGNATURE (same structure as quote response): TRANSACTION step:

Attribute	Type	Description
`type`	string	`TRANSACTION`
`description`	string	Human-readable action description
`chainKey`	string	Chain to execute on
`chainType`	enum	`EVM`, `SOLANA`, `STARKNET`
`signerAddress`	string	Wallet that must sign
`transaction`	object	Transaction details
`transaction.encoded`	object	Encoded transaction data

For Solana, the transaction data is base64-encoded:

{
  type: "TRANSACTION",
  chainType: "SOLANA",
  transaction: {
    encoded: {
      encoding: "base64",
      data: "AQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAQABAgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA..."
    }
  }
}

Code examples

cURL
TypeScript
Python

curl -X POST "https://transfer.layerzero-api.com/v1/build-user-steps" \
  -H "Content-Type: application/json" \
  -H "x-api-key: YOUR_API_KEY" \
  -d '{"quoteId": "QUOTE_ID_FROM_SOLANA_QUOTE"}'

const response = await fetch('https://transfer.layerzero-api.com/v1/build-user-steps', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'x-api-key': 'YOUR_API_KEY',
  },
  body: JSON.stringify({quoteId: quote.id}),
});

const {userSteps} = await response.json();
console.log('User steps:', userSteps);

import requests

response = requests.post(
  "https://transfer.layerzero-api.com/v1/build-user-steps",
  headers={"x-api-key": "YOUR_API_KEY"},
  json={"quoteId": quote["id"]},
)

user_steps = response.json()["userSteps"]
print("User steps:", user_steps)

Response

{
  "userSteps": [
    {
      "type": "TRANSACTION",
      "description": "bridge",
      "chainKey": "solana",
      "chainType": "SOLANA",
      "signerAddress": "Dz93pUVjXuaMnSsPSn7V99V4cUzhKoQdx9ECwZJZiafG",
      "transaction": {
        "encoded": {
          "encoding": "base64",
          "data": "AQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABAAkT..."
        }
      }
    }
  ]
}

Solana execution

After building user steps, deserialize and sign the transaction:

import {VersionedTransaction, Connection} from '@solana/web3.js';

// Get fresh user steps
const {userSteps} = await buildUserSteps(quoteId);
const step = userSteps[0];

// Decode base64 transaction
const txBuffer = Buffer.from(step.transaction.encoded.data, 'base64');
const tx = VersionedTransaction.deserialize(txBuffer);

// Sign and send
const signedTx = await wallet.signTransaction(tx);
const signature = await connection.sendRawTransaction(signedTx.serialize());

await connection.confirmTransaction(signature, 'confirmed');

Why Solana needs fresh transactions

Solana transactions include a recent blockhash that expires after ~60 seconds. The /build-user-steps endpoint generates transactions with the latest blockhash, ensuring they remain valid during execution. Workflow:

Request quote → Receive quote with quoteId
Call /build-user-steps with quoteId → Get fresh transaction
Sign and submit immediately (within 60 seconds)

Quotes — Request transfer quotes (includes userSteps for EVM)
Status — Track transfer progress after execution

Examples

Solana Example — Complete Solana transfer with transaction building

Authorizations

x-api-key

string

header

required

API key for authenticating requests. Required for /quotes, /build-user-steps, /submit-signature, and /status endpoints.

Body

application/json

quoteId

string

required

The quote ID to build steps for

Example:

"quote_abc123"

Response

200 - application/json

Successfully built user steps

userSteps

object[]

Show child attributes

Quotes Submit Signature

⌘I

Value Transfer API

Contracts

API Reference

Examples

Reference

When to use

Request body

Response

User step attributes

Code examples

Response

Solana execution

Why Solana needs fresh transactions

Examples

Authorizations

Body

Response

​Reference

​When to use

​Request body

​Response

​User step attributes

​Code examples

​Response

​Solana execution

​Why Solana needs fresh transactions

​Related endpoints

​Examples

Authorizations

Body

Response

Reference

When to use

Request body

Response

User step attributes

Code examples

Response

Solana execution

Why Solana needs fresh transactions

Related endpoints

Examples