Sending USDC across chains

Sending USDC across chains is the most common Routes flow. This recipe walks through a server-side integration: get a quote, publish and fund the intent onchain using the encodedRoute from the quote, poll for fulfillment. For an interactive CLI walkthrough instead, see the Routes CLI guide.

1. Get a quote

curl -X POST https://quotes.eco.com/api/v3/quotes/single \
  -H "Content-Type: application/json" \
  -d '{
    "dAppID": "your-app",
    "quoteRequest": {
      "sourceChainID": 10,
      "destinationChainID": 8453,
      "sourceToken": "0x0b2C639c533813f4Aa9D7837CAf62653d097Ff85",
      "destinationToken": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "sourceAmount": "1000000",
      "funder": "0xYourWalletAddress",
      "recipient": "0xRecipientAddress"
    }
  }'

The response includes quoteResponse.encodedRoute, quoteResponse.deadline, contracts.sourcePortal, and contracts.prover. That’s everything you need to publish onchain.

2. Approve the reward token to the source Portal

import { erc20Abi } from 'viem';

const portal = quote.data.contracts.sourcePortal;
const rewardToken = quote.data.quoteResponse.sourceToken;
const rewardAmount = BigInt(quote.data.quoteResponse.sourceAmount);

const allowance = await publicClient.readContract({
  address: rewardToken,
  abi: erc20Abi,
  functionName: 'allowance',
  args: [user, portal],
});

if (allowance < rewardAmount) {
  await walletClient.writeContract({
    address: rewardToken,
    abi: erc20Abi,
    functionName: 'approve',
    args: [portal, rewardAmount],
  });
}

3. Publish and fund

Build the reward struct from the quote and call publishAndFund on the source Portal.

const reward = {
  deadline: BigInt(quote.data.quoteResponse.deadline),
  creator: user,
  prover: quote.data.contracts.prover,
  nativeAmount: 0n,
  tokens: [{ token: rewardToken, amount: rewardAmount }],
};

const tx = await walletClient.writeContract({
  address: portal,
  abi: portalAbi,
  functionName: 'publishAndFund',
  args: [
    BigInt(quote.data.quoteResponse.destinationChainID),
    quote.data.quoteResponse.encodedRoute,
    reward,
    false, // allowPartial
  ],
});

const receipt = await publicClient.waitForTransactionReceipt({ hash: tx });
// Read the IntentPublished event from the receipt logs to get intentHash

4. Track fulfillment

curl -X POST https://quotes.eco.com/api/v3/intents/intentStatus \
  -H "Content-Type: application/json" \
  -d '{ "intentHash": "0x..." }'

Status returns

{ status: "Pending" | "Completed", subStatus: "WaitingToFulfill" | "WaitingForRefund" | "Fulfilled" | "Refunded", subStatusMessage }

. Typical fulfillment: 20–40 seconds. You’ve successfully sent USDC across chains.

​1. Get a quote

​2. Approve the reward token to the source Portal

​3. Publish and fund

​4. Track fulfillment

1. Get a quote

2. Approve the reward token to the source Portal

3. Publish and fund

4. Track fulfillment