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Use an exact-input quote to send USDC from Base to OP Mainnet. The Routes API walkthrough provides the request code and explains quote verification, funding, and tracking.

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Prerequisites

  • A server-side API key enabled for v1
  • A Base wallet with USDC and ETH for approval and funding transactions
  • The recipient’s OP Mainnet address
  • The current supported chain and token configuration

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Configure the transfer

The example amount is illustrative; quote availability and fees depend on the request. Check the returned amountOut, minAmountOut, fees, and expiry before funding.

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Complete the transfer

  1. Request and verify the quote. Verify the signed intent hashes and check that the funding transaction and delivery route match your request.
  2. Approve USDC to the returned funding transaction’s Portal when needed. Wait for a successful approval receipt, then estimate gas and send the funding transaction before the quote expires.
  3. Track the delivery intent with GET /v1/intents/status. For a direct transfer, this is the quote’s intentHash; inspect steps[] for routes with multiple intents.
  4. Confirm filled or settled on the delivery intent. A successful funding receipt alone does not confirm destination delivery.
The reference implementation uses this Base-to-OP pair by default and stops after quote verification unless execution is explicitly enabled.

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Troubleshooting

  • 401 or 403: check your API key and v1 access.
  • 502 solver-error: no usable quote was returned. Check the token pair and amount; retry within a bounded budget.
  • An expired quote: request and verify a fresh quote before funding.
  • refundable or expired: inspect the refund path. These states do not mean the source funds have returned.

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Next steps