Stablecoins from Arbitrum One to OP Mainnet (Optimism): USDT Arbitrum → USDC Optimism

Q: What rate does USDT Arbitrum to USDC Optimism run at?

As of Sep 17, 2026 16:53 it is 1 USDT Arbitrum = 0.9996 USDC Optimism. The figure recalculates on its own, and the calculator always shows the fresh one. In dollars that is around $0.999171.

Q: What else is taken on top of the rate?

The payout is already calculated at the rate in the calculator. On top of it you only pay the network fee for sending USDT Arbitrum, and that one goes to the blockchain, not to us.

Q: How long does USDT Arbitrum to USDC Optimism take?

The clock starts with confirmations: the order goes into work once Arbitrum One confirms your transfer. After that it comes down to how busy the network is. A block in Arbitrum One closes in about 0.25 sec.

Q: Which network will USDC Optimism arrive in?

The payout leaves in Optimism. Make sure the receiving wallet works with that network.

Q: Where is receiving USDC cheaper?

The cheapest is usually USDC Polygon, USDC SOL, USDC Arbitrum, USDC BEP20, USDC AVAX C, USDC Optimism. Still, the network is chosen by what the recipient supports, not by the fee.

Q: Will native USDC arrive, or a wrapper?

USDC Optimism is the standard USDC token in OP Mainnet (Optimism) — exactly what exchanges send when they withdraw into this network.

Q: Do I need ETH to receive USDC Optimism?

Not to receive. ETH comes into play later, when you want to send USDC from your address.

Q: What if the rate moves while I am paying?

The rate is pinned to the order and does not move while the order is alive. It can be recalculated if the payment arrives late or for a different amount — so send the exact sum, and send it promptly.

Q: What did the USDT Arbitrum to USDC Optimism rate do this month?

The month came in at a move of 0%. Low 0.999577, high 1.0002, middle 0.999912 USDC Optimism per USDT Arbitrum.

Q: Can I go back, USDC Optimism to USDT Arbitrum?

Yes, the reverse direction is open: 1 USDC Optimism = 1.0006 USDT Arbitrum. The link sits right under the calculator.

The direction runs at 0.9996 USDC Optimism per USDT Arbitrum, or 1.0004 USDT Arbitrum per USDC Optimism. Market over 24 hours: USDT Arbitrum against USDC Optimism minus 0.01%. The week added minus 0.02%.

The weekly corridor ran from 0.999575 to 0.999993 USDC Optimism, a spread of 0.04%.

The payout leaves in the Optimism network, so the receiving address has to belong to that network. By market cap Tether sits 3th ($183.29 B) and USD Coin 6th ($73.56 B). Daily moves of USDT and USDC over 90 days line up at 0.16 (they travel apart).

Who takes the USDT Arbitrum → USDC Optimism route

A road both waysThe USDC Optimism → USDT Arbitrum direction is open too, so going back into USDT takes the same route.

USDT Arbitrum → USDC Optimism rate and amounts

1 USDT Arbitrum = 0.9996 USDC Optimism

1 USDC Optimism = 1.0004 USDT Arbitrum

Send USDT Arbitrum — receive USDC Optimism

USDT Arbitrum	USDC Optimism
20	19.992
100	99.96
500	499.8001
5,000	4,998
20,000	19,992
100,000	99,960.02

Need USDC Optimism — send this much USDT Arbitrum

USDC Optimism	USDT Arbitrum
20	20.008
100	100.04
500	500.2
5,000	5,002
20,000	20,008
100,000	100,040

Payout network for USDC

The same USDC goes out in several networks. Rates and lower limits differ, and the fee is charged by the network itself.

Network	Per USDT Arbitrum	From	Network fee	Speed
Polygon	0.997694	100 USDT Arbitrum	≈ $0.0018	fast
Solana	1.0013	10,500 USDT Arbitrum	≈ $0.0005	fast
Ethereum (ERC20)	1.0013	100 USDT Arbitrum	≈ $0.055	medium
Arbitrum One	0.9996	—	≈ $0.0033	fast
BASE	0.9996	—	—	—
BNB Smart Chain (BEP20)	0.9996	—	≈ $0.0024	fast
Avalanche C-Chain	0.9996	—	≈ < $0.0001	fast
NEAR	0.9996	—	—	—
Optimism open now	0.9996	—	≈ $0.00017	fast
XLM	0.9996	—	—	—

USDC network fees

How the USDT Arbitrum → USDC Optimism order runs

Work out the amount in the calculator and press the exchange button.
Enter a USDC address in Optimism and a way to reach you.
Send USDT Arbitrum in Arbitrum One for exactly the amount stated in the order.
Once the network confirms your transfer, USD Coin leaves for your address. The order page tracks every step.

Swap USDT Arbitrum for USDC Optimism

Check this before sending USDT Arbitrum

The address network is Optimism. Sending through another network usually means losing the transfer.
Copy the address whole, then compare the first and last characters after pasting.
Ethereum, Arbitrum, Optimism, BNB Smart Chain and Polygon all use the same address shape (0x…). Make sure the wallet is switched to OP Mainnet (Optimism).
To move USDC on later, put a little ETH at the same address.
Coins go through an AML check: a flagged transfer can be held until the check is finished.

Arbitrum One against OP Mainnet (Optimism)

	Arbitrum One	OP Mainnet (Optimism)
Network type	L2, optimistic rollup	L2, optimistic rollup
Fees are paid in	ETH	ETH
Fee level	≈ $0.0033	≈ $0.00017
Speed	fast	fast
Block	~0.25 sec	~2 sec
Address shape	0x…	0x…
Memo or tag	not needed	not needed
Ethereum-style address (0x…)	yes	yes
Official withdrawal to Ethereum	≈ 7 days (challenge period)	≈ 7 days (challenge period)

Fee and speed levels are comparative: both move with how busy the network is.

How this differs from a classic bridge

	RubyCash	Classic bridge
What lands at your address	USDC in OP Mainnet (Optimism)	The same stablecoin; turning USDT into USDC is a separate step
Wallet and signatures	Not needed: the coins go to the address from the order	Needed: connect the wallet and sign contract transactions
A coin for fees in OP Mainnet (Optimism)	Not needed to receive	Often needed, or the funds cannot be claimed or moved on
Timing	After confirmations in Arbitrum One; the order page tracks it	Depends on the bridge and the load of both networks
Who holds the funds meanwhile	RubyCash for the life of the order, with an AML check	The bridge contract or its validators

Bridge Arbitrum One → OP Mainnet (Optimism): all directions The OP Mainnet (Optimism) network

Where the USDT Arbitrum to USDC Optimism rate has been

WeekMonthQuarterYear

high 0.999993 USDC Optimismlow 0.999575 USDC Optimism

Sep 10, 2026 16:56Sep 17, 2026 16:56

high 1.0002 USDC Optimismlow 0.999577 USDC Optimism

Aug 18, 2026 03:00Sep 17, 2026 03:00

high 1.0002 USDC Optimismlow 0.999327 USDC Optimism

Jun 19, 2026 03:00Sep 17, 2026 03:00

high 1.0017 USDC Optimismlow 0.996801 USDC Optimism

Sep 18, 2025 03:00Sep 17, 2026 03:00

24 hours: −0.01%
Week: −0.02%
Weekly high: 0.999993 USDC Optimism
Weekly low: 0.999575 USDC Optimism
Spread: 0.04%

Market data from CoinGecko as of Sep 17, 2026 15:54; the exchange rate is calculated separately and differs. Where these numbers come from

How far USDT Arbitrum/USDC Optimism travelled, by period

Period	High	Low	Middle	Net move
24 hours	0.99975	0.999575	0.999641	−0.01%
Week	0.999993	0.999575	0.999831	−0.02%
Month	1.0002	0.999577	0.999912	0%
Quarter	1.0002	0.999327	0.999705	0%

Figures are in USDC Optimism per unit sent, from market data.

Daily USDT Arbitrum → USDC Optimism rate

Day	Close	Against the day before
Sep 17, 2026	0.999591 USDC Optimism	−0.01%
Sep 16, 2026	0.999723 USDC Optimism	−0.03%
Sep 15, 2026	0.999985 USDC Optimism	+0.01%
Sep 14, 2026	0.999848 USDC Optimism	−0.01%
Sep 13, 2026	0.999949 USDC Optimism	0%
Sep 12, 2026	0.999966 USDC Optimism	+0.02%
Sep 11, 2026	0.999808 USDC Optimism	0%

The numbers on USDT and USDC

Tether USDT

Price: $0.999175
24 hours: −0.02%
Week: 0%
Market cap: $183.29 B
24-hour turnover: $60.77 B
Rank by cap: #3
In circulation: 183.44 B USDT
Record price: $1.32

USD Coin USDC

Price: $0.999571
24 hours: −0.01%
Week: 0%
Market cap: $73.56 B
24-hour turnover: $18.85 B
Rank by cap: #6
In circulation: 73.59 B USDC
Record price: $1.04

Source: CoinGecko, Sep 17, 2026 15:54.

Tether against USD Coin

	Tether (USDT)	USD Coin (USDC)
Ticker	USDT	USDC
Type	token	token
Network	Arbitrum One	Optimism
Fees are paid in	ETH	ETH
Launched	2014	2018
Built by	Tether Limited	Circle
Supply cap	no cap	no cap
In circulation	183.44 B USDT	73.59 B USDC
Market cap	$183.29 B	$73.56 B
Rank by cap	#3	#6

Daily moves of USDT and USDC over 90 days line up at 0.16 — they travel apart.

Common questions: USDT Arbitrum → USDC Optimism

What rate does USDT Arbitrum to USDC Optimism run at?

As of Sep 17, 2026 16:53 it is 1 USDT Arbitrum = 0.9996 USDC Optimism. The figure recalculates on its own, and the calculator always shows the fresh one. In dollars that is around $0.999171.

What else is taken on top of the rate?

The payout is already calculated at the rate in the calculator. On top of it you only pay the network fee for sending USDT Arbitrum, and that one goes to the blockchain, not to us.

How long does USDT Arbitrum to USDC Optimism take?

The clock starts with confirmations: the order goes into work once Arbitrum One confirms your transfer. After that it comes down to how busy the network is. A block in Arbitrum One closes in about 0.25 sec.

Which network will USDC Optimism arrive in?

The payout leaves in Optimism. Make sure the receiving wallet works with that network.

Where is receiving USDC cheaper?

The cheapest is usually USDC Polygon, USDC SOL, USDC Arbitrum, USDC BEP20, USDC AVAX C, USDC Optimism. Still, the network is chosen by what the recipient supports, not by the fee.

Will native USDC arrive, or a wrapper?

USDC Optimism is the standard USDC token in OP Mainnet (Optimism) — exactly what exchanges send when they withdraw into this network.

Do I need ETH to receive USDC Optimism?

Not to receive. ETH comes into play later, when you want to send USDC from your address.

What if the rate moves while I am paying?

The rate is pinned to the order and does not move while the order is alive. It can be recalculated if the payment arrives late or for a different amount — so send the exact sum, and send it promptly.

What did the USDT Arbitrum to USDC Optimism rate do this month?

The month came in at a move of 0%. Low 0.999577, high 1.0002, middle 0.999912 USDC Optimism per USDT Arbitrum.

Can I go back, USDC Optimism to USDT Arbitrum?