Submit signature

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

POST/submit-signature

---

Submit signed EIP-712 messages for intent-based transfers (for example, Aori routes). Required when a quote includes SIGNATURE user steps.

Header Parameters	Value
x-api-key string required Your API key

Body Parameters	Value
quoteId string required The quote ID from the /quotes response
signatures string required Array of signature hex strings

Send Request

Response

{}

---

Reference

Authentication

Required. Include your API key in the x-api-key header.

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

curl -X POST "https://transfer.layerzero-api.com/v1/submit-signature" \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "quoteId": "quote_abc123",
    "signatures": ["0x1234567890abcdef..."]
  }'

TypeScript

const response = await fetch('https://transfer.layerzero-api.com/v1/submit-signature', {
  method: 'POST',
  headers: {
    'x-api-key': process.env.VT_API_KEY,
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    quoteId: 'quote_abc123',
    signatures: ['0x1234567890abcdef...'],
  }),
});

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

console.log('Signature submitted successfully');

Python

import requests

response = requests.post(
  "https://transfer.layerzero-api.com/v1/submit-signature",
  headers={
    "x-api-key": "YOUR_API_KEY",
    "Content-Type": "application/json",
  },
  json={
    "quoteId": "quote_abc123",
    "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

import {type WalletClient} from 'viem';

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

ethers

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: {
    'x-api-key': process.env.VT_API_KEY,
    'Content-Type': 'application/json',
  },
  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: {
          'x-api-key': process.env.VT_API_KEY,
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({
          quoteId: quote.id,
          signatures: [signature],
        }),
      });
    }
  }
}

Errors

HTTP Status	Description
400	Invalid signature or quote ID
401	Missing or invalid API key
404	Quote not found

Related endpoints

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