Arbitrum One → OP Mainnet (Optimism): How to Move USDC and USDT

Routes Arbitrum One → OP Mainnet (Optimism)

Blockchain	Direction	Rate	Minimum
Arbitrum One	USDC Arbitrum → USDC Optimism	1 USDC Arbitrum = 1.001 USDC Optimism	100.67 USDC Arbitrum
Arbitrum One	USDT Arbitrum → USDT Optimism	1 USDT Arbitrum = 1.001 USDT Optimism	100.67 USDT Arbitrum
Arbitrum One	USDC Arbitrum → USDT Optimism	1 USDC Arbitrum = 1.001 USDT Optimism	100.67 USDC Arbitrum
Arbitrum One	USDT Arbitrum → USDC Optimism	1 USDT Arbitrum = 0.998991 USDC Optimism	100.67 USDT Arbitrum

Compared: Arbitrum One and OP Mainnet (Optimism)

	Arbitrum One	OP Mainnet (Optimism)
What kind of network	Optimistic rollup (L2)	Optimistic rollup (L2)
What pays the fee	ETH	ETH
How expensive	low	low
How fast	fast	fast
Block time	~0.25 sec	~2 sec
Address format	0x…	0x…
Memo or tag needed	not required	not required
Ethereum-format address (0x…)	yes	yes
Withdrawal to Ethereum through the official bridge	≈ 7 days — the challenge window runs	≈ 7 days — the challenge window runs

The cost and speed marks are given against each other: both drift with the load on the network.

How an exchange differs from an ordinary bridge

	Velorex	Ordinary bridge
What arrives at the address	Native ETH or standard tokens of the OP Mainnet (Optimism) network	It varies: a number of networks hand out the bridged version of the token
Wallet connection and signatures	We do without them: the payout goes to the address from the order	Mandatory: the wallet is connected, contract transactions are signed
Is a OP Mainnet (Optimism) coin needed for fees	Not required to receive	As a rule yes, otherwise the funds cannot be claimed or moved on
When it arrives	As soon as Arbitrum One gathers confirmations; the status is shown on the order page	Set by the bridge itself and by the load on both networks
Who holds the funds on the way	Velorex — until the order is closed by the payout	The smart contract of the bridge or its validators

How to make the move from Arbitrum One to OP Mainnet (Optimism)

Find the route you need in the table above and work the amount out with the calculator on its page.
Enter an address that belongs to the OP Mainnet (Optimism) network (0x…).
Send the coins over the Arbitrum One network to the details in the order — the amount has to match down to the last digit.
When Arbitrum One gathers confirmations, automation sends the coins to your address in OP Mainnet (Optimism). The status is visible on the order page.

Check before sending to OP Mainnet (Optimism)

Take the receiving address only from the OP Mainnet (Optimism) network (0x…).
Ethereum, Arbitrum, Optimism, BNB Smart Chain and Polygon addresses look the same (0x…) — make sure the wallet is switched to OP Mainnet (Optimism).
Send the coins over the Arbitrum One network only: from another network they never reach the order.
Send exactly the amount stated in the order: the automation matches your payment against it, and any difference sends the order back for recalculation.

Questions about the Arbitrum One → OP Mainnet (Optimism) pairing

How do coins get from Arbitrum One to OP Mainnet (Optimism)?

Through an exchange order: you send coins over Arbitrum One, and USDC and USDT are credited to your address in OP Mainnet (Optimism). No bridge contracts, no wallet connection and no wrappers.

What can be carried from Arbitrum One to OP Mainnet (Optimism)?

Available: USDC and USDT. Rates and minimum amounts are collected in the table above.

How fast is a transfer from Arbitrum One to OP Mainnet (Optimism)?

First Arbitrum One gathers confirmations, then the payout leaves for OP Mainnet (Optimism). The final time is dictated by the load on both networks. One Arbitrum One block takes about 0.25 sec.

What pays the fee in OP Mainnet (Optimism)?

The ETH coin. Holding it is not required to receive funds — it is only needed at the moment you send them on yourself.

Which address suits OP Mainnet (Optimism)?

Only one from the OP Mainnet (Optimism) network, of the form 0x… A familiar Ethereum-format address (0x…) will do — all that matters is that OP Mainnet (Optimism) is selected in the wallet.