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Summary

1

Get a Quote

In this step we’ll request a quote that includes all fees, transaction data, and execution steps required to bridge assets.
2

Execute the Bridge

Once we have the quote, we’ll execute the bridge by submitting transactions and monitoring progress.

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Get a Quote

To bridge assets, you first need to get a quote that provides all necessary information including fees, transaction data, and execution steps. Use the quote endpoint to request bridging information.

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Basic Quote Request

curl -X POST "https://api.relay.link/quote" \
  -H "Content-Type: application/json" \
  -d '{
    "user": "0x742d35Cc6634C0532925a3b8D9d4DB0a2D7DD5B3",
    "originChainId": 1,
    "destinationChainId": 8453,
    "originCurrency": "0x0000000000000000000000000000000000000000",
    "destinationCurrency": "0x0000000000000000000000000000000000000000",
    "amount": "100000000000000000",
    "tradeType": "EXACT_INPUT"
  }'

​
Quote Response Structure

The quote response contains all information needed to execute the bridge: 
{
  "steps": [
    {
      "id": "deposit",
      "action": "Confirm transaction in your wallet",
      "description": "Deposit funds for executing the bridge",
      "kind": "transaction",
      "requestId": "0x92b99e6e1ee1deeb9531b5ad7f87091b3d71254b3176de9e8b5f6c6d0bd3a331",
      "items": [
        {
          "status": "incomplete",
          "data": {
            "from": "0x742d35Cc6634C0532925a3b8D9d4DB0a2D7DD5B3",
            "to": "0xf70da97812cb96acdf810712aa562db8dfa3dbef",
            "data": "0x00fad611",
            "value": "100000000000000000",
            "chainId": 1
          },
          "check": {
            "endpoint": "/intents/status?requestId=0x92b99e6e1ee1deeb9531b5ad7f87091b3d71254b3176de9e8b5f6c6d0bd3a331",
            "method": "GET"
          }
        }
      ]
    }
  ],
  "fees": {
    "gas": {
      "amount": "21000000000000000",
      "currency": "eth"
    },
    "relayer": {
      "amount": "5000000000000000",
      "currency": "eth"
    }
  },
  "details": {
    "operation": "bridge",
    "timeEstimate": 30,
    "currencyIn": {
      "currency": {
        "chainId": 1,
        "address": "0x0000000000000000000000000000000000000000",
        "symbol": "ETH",
        "name": "Ethereum",
        "decimals": 18
      },
      "amount": "100000000000000000"
    },
    "currencyOut": {
      "currency": {
        "chainId": 8453,
        "address": "0x0000000000000000000000000000000000000000",
        "symbol": "ETH",
        "name": "Ethereum",
        "decimals": 18
      },
      "amount": "95000000000000000"
    }
  }
}

​
Quote Parameters

ParameterTypeRequiredDescription
userstringYesAddress that will deposit funds and submit transactions
originChainIdnumberYesSource chain ID (e.g., 1 for Ethereum)
destinationChainIdnumberYesDestination chain ID (e.g., 8453 for Base)
originCurrencystringYesCurrency contract on source chain (e.g., “0x0000000000000000000000000000000000000000”, “0x833589fcd6edb6e08f4c7c32d4f71b54bda02913”)
destinationCurrencystringYesCurrency contract on destination chain
amountstringYesAmount in wei/smallest unit
tradeTypestringYes”EXACT_INPUT” or “EXACT_OUTPUT”
recipientstringNoRecipient address (defaults to user)
slippageTolerancestringNoSlippage in basis points (e.g., “50” for 0.5%)
useExternalLiquiditybooleanNoUse canonical+ bridging for more liquidity
referrerstringNoIdentifier that can be used to monitor transactions from a specific source.
refundTostringNoAddress to send the refund to in the case of failure, if not specified the user address is used
topupGasbooleanNoIf set, the destination fill will include a gas topup to the recipient (only supported for EVM chains if the requested currency is not the gas currency on the destination chain)
topupGasAmountstringNoThe destination gas topup amount in USD decimal format, e.g 100000 = $1. topupGas is required to be enabled. Defaults to 2000000 ($2)

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Execute the Bridge

After receiving a bridge quote, execute it by processing each step in the response. The execution handles both the origin chain transaction and destination chain fulfillment.

Learn more about step execution using the API here.

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Monitor Bridge Status

You can check the status of a bridge operation at any time using the /intents/status endpoint: 
curl "https://api.relay.link/intents/status?requestId=0x92b99e6e1ee1deeb9531b5ad7f87091b3d71254b3176de9e8b5f6c6d0bd3a331"

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Status Values

StatusDescription
waitingDeposit tx for the request is yet to be indexed
pendingDeposit tx was indexed, now the fill is pending
successRelay completed successfully
failureRelay failed
refundFunds were refunded due to failure

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Advanced Features

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App Fees

You can include app fees in your bridge requests to monetize your integration: 
{
  "user": "0x742d35Cc6634C0532925a3b8D9d4DB0a2D7DD5B3",
  "originChainId": 1,
  "destinationChainId": 8453,
  "originCurrency": "eth",
  "destinationCurrency": "eth",
  "amount": "100000000000000000",
  "tradeType": "EXACT_INPUT",
  "appFees": [
    {
      "recipient": "0x742d35Cc6634C0532925a3b8D9d4DB0a2D7DD5B3",
      "fee": "100"  // 1% in basis points
    }
  ]
}

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Custom Slippage

Control slippage tolerance for your bridges: 
{
  "user": "0x742d35Cc6634C0532925a3b8D9d4DB0a2D7DD5B3",
  "originChainId": 1,
  "destinationChainId": 8453,
  "originCurrency": "eth",
  "destinationCurrency": "eth",
  "amount": "100000000000000000",
  "tradeType": "EXACT_INPUT",
  "slippageTolerance": "50"  // 0.5% slippage tolerance
}

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Preflight Checklist

☐ Verify user balance - Ensure the user has sufficient funds for the bridge amount plus fees ☐ Check chain support - Confirm both origin and destination chains are supported ☐ Validate quote - Quotes expire after 30 seconds, so fetch fresh quotes before execution ☐ Handle errors - Implement proper error handling for API requests and transaction failures ☐ Monitor progress - Use the status endpoints to track bridge completion