Submit Signature - LayerZero

Submits EIP-712 signatures for intent-based routes like Aori. Required when a quote includes SIGNATURE user steps.

Reference

When to use

Route type	When to call
AORI_V1	Required. Intent-based routes need off-chain signature submission.
Other routes	Not applicable. Use on-chain transactions only.

Request body

Parameter	Type	Required	Description
`quoteId`	string	Yes	Quote ID from the `/quotes` response
`signatures`	string or array	Yes	EIP-712 signature(s) as hex string(s)

Response

Returns an empty object on success.

{}

Code examples

cURL
TypeScript
Python

curl -X POST "https://transfer.layerzero-api.com/v1/submit-signature" \
  -H "Content-Type: application/json" \
  -H "x-api-key: YOUR_API_KEY" \
  -d '{
    "quoteId": "QUOTE_ID",
    "signatures": ["0x1234567890abcdef..."]
  }'

const response = await fetch('https://transfer.layerzero-api.com/v1/submit-signature', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'x-api-key': 'YOUR_API_KEY',
  },
  body: JSON.stringify({
    quoteId: 'QUOTE_ID',
    signatures: ['0x1234567890abcdef...'],
  }),
});

if (!response.ok) {
  throw new Error(`Signature submission failed: ${response.statusText}`);
}

console.log('Signature submitted successfully');

import requests

response = requests.post(
  "https://transfer.layerzero-api.com/v1/submit-signature",
  headers={"x-api-key": "YOUR_API_KEY"},
  json={
    "quoteId": "QUOTE_ID",
    "signatures": ["0x1234567890abcdef..."],
  },
)

if not response.ok:
  raise Exception(f"Signature submission failed: {response.status_code}")

print("Signature submitted successfully")

Signing EIP-712 messages

When a quote includes a SIGNATURE user step, sign the EIP-712 typed data and submit it:

Step 1: Extract typed data

const signatureStep = quote.userSteps.find((step) => step.type === 'SIGNATURE');
const {domain, types, message} = signatureStep.signature.typedData;

Step 2: Convert BigInt fields

BigInt conversion required: The API returns numeric message fields as strings for JSON compatibility. Convert these to BigInt before signing.

const normalizedMessage = {
  ...message,
  inputAmount: BigInt(message.inputAmount),
  outputAmount: BigInt(message.outputAmount),
  startTime: BigInt(message.startTime),
  endTime: BigInt(message.endTime),
};

Step 3: Sign typed data

viem
ethers

import {type WalletClient} from 'viem';

const signature = await walletClient.signTypedData({
  domain,
  types,
  primaryType: Object.keys(types).find((key) => key !== 'EIP712Domain'),
  message: normalizedMessage,
});

import {ethers} from 'ethers';

const signature = await signer._signTypedData(domain, types, normalizedMessage);

Step 4: Submit signature

await fetch('https://transfer.layerzero-api.com/v1/submit-signature', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'x-api-key': 'YOUR_API_KEY',
  },
  body: JSON.stringify({
    quoteId: quote.id,
    signatures: [signature],
  }),
});

Complete example

async function executeAoriRoute(quote: Quote, walletClient: WalletClient) {
  for (const step of quote.userSteps) {
    if (step.type === 'SIGNATURE') {
      const {domain, types, message} = step.signature.typedData;

      // Convert numeric fields to BigInt
      const normalizedMessage = {
        ...message,
        inputAmount: BigInt(message.inputAmount),
        outputAmount: BigInt(message.outputAmount),
        startTime: BigInt(message.startTime),
        endTime: BigInt(message.endTime),
      };

      // Sign EIP-712 message
      const signature = await walletClient.signTypedData({
        domain,
        types,
        primaryType: Object.keys(types).find((k) => k !== 'EIP712Domain'),
        message: normalizedMessage,
      });

      // Submit signature to API
      await fetch('https://transfer.layerzero-api.com/v1/submit-signature', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'x-api-key': 'YOUR_API_KEY',
        },
        body: JSON.stringify({
          quoteId: quote.id,
          signatures: [signature],
        }),
      });
    }
  }
}

Errors

HTTP Status	Description
`400`	Invalid signature or quote ID
`404`	Quote not found

Quotes — Request transfer quotes (includes SIGNATURE steps for Aori routes)
Status — Track transfer progress after signature submission

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 from the /quotes response

Example:

"quote_abc123"

signatures

string[]

required

Array of signature hex strings

Example:

["0x..."]

Response

200 - application/json

Signature submitted successfully

The response is of type object.

Documentation Index

​Reference

​When to use

​Request body

​Response

​Code examples

​Signing EIP-712 messages

​Step 1: Extract typed data

​Step 2: Convert BigInt fields

​Step 3: Sign typed data

​Step 4: Submit signature

​Complete example

​Errors

​Related endpoints

Authorizations

Body

Response

Reference

When to use

Request body

Response

Code examples

Signing EIP-712 messages

Step 1: Extract typed data

Step 2: Convert BigInt fields

Step 3: Sign typed data

Step 4: Submit signature

Complete example

Errors

Related endpoints