Create a crypto off-ramp transfer: sell USDC and send fiat to a bank account. From a locked quote and a recipient, returns a transfer_id and a Base USDC deposit_address plus the exact amount to send. Fund it on-chain, then call /confirm-transfer. Converts stablecoin to a bank payout in 80+ currencies. Funding wallet KYC and sanctions enforced upstream. Pay 0.01 USDC.